CN105527694A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN105527694A CN105527694A CN201510679740.7A CN201510679740A CN105527694A CN 105527694 A CN105527694 A CN 105527694A CN 201510679740 A CN201510679740 A CN 201510679740A CN 105527694 A CN105527694 A CN 105527694A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
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Abstract
The invention provides an optical imaging lens. The optical lens comprises first, second, third, fourth and fifth lens bodies, wherein the focal power of the first lens body is negative; the focal power of the second lens body is positive; the third and fourth lens bodies form an achromatic lens group; and the focal power of the fifth lens body is positive, and the fifth lens body includes at least one aspheric surface.
Description
Technical field
The present invention relates to optical image technology field, particularly relate to a kind of optical lens for optical imagery.
Background technology
Existing Indoor Video imaging system or vehicle-mounted imaging system, especially preposition imaging system, the optical imaging system of employing mostly is dioptric imaging.When actual imaging, the image that the light sent formed by an object point obtains through the optical lens dioptric imaging of dioptric imaging system can be subject to the multiple factor that may cause aberration, as the impact of the factors such as spherical aberration, coma aberration, astigmatism, filed curvature and distortion.
In order to obtain large aperture, high pixel, distort little imaging effect, needs achromat to help reduce aberration.Common achromat generally comprises two incompatible single element lens of the aberration combined, as balsaming lens and air-spaced doublet.But, when imagery optical system only adopts single achromat to be embodied as picture, be difficult to reduce the factor that other affects image quality, and single achromat to realize good imaging, need to use Extra-low Dispersion eyeglass (ED eyeglass), as the eyeglass that fluorite is made.But the difficulty of processing of fluorite is large, in the high and production run of production cost, environmental pollution can be brought.In addition, fluorite is frangible, causes whole optical lens to be not suitable for using under complexity and rugged surroundings.
In addition, along with the development of auto industry active safety, require to improve constantly to vehicle-mounted front view lens.Distort little, miniaturization, mega pixel, high-aperture lenses has been the necessary requirement of this type of camera lens.And require low cost, in the temperature range of-40 DEG C ~+85 DEG C, keep more perfect imaging definition.
At present wide-angle Indoor Video on the market and in-vehicle camera camera lens can't meet under the condition of low cost, miniaturization, realize high pixel, distort little, large aperture imaging.
Summary of the invention
Fundamental purpose of the present invention is that it provides a kind of new optical lens, and wherein each lens of this optical lens all can by normal optical manufactured materials, and as glass or plastics are made, its production cost is low.
Another object of the present invention is to it and provide a kind of new optical lens, wherein the manufacture of the manufactured materials of each lens of this optical lens is more friendly to environment.
Another object of the present invention is to it and provide a kind of new optical lens, the image wherein using the imaging system of this optical lens to obtain has less filed curvature and distortion.
Another object of the present invention is to it and provide a kind of new optical lens, wherein each lens of this optical lens can be miniaturized.
Another object of the present invention is to it and a kind of new optical lens be provided, wherein this optical lens can realize large aperture and high pixel blur-free imaging.
Another object of the present invention is to it and a kind of new optical lens is provided, wherein each lens of this optical lens all can be made up of glass material, thus make whole optical lens can in larger range of temperature, as all can be clear and be stable into picture in-40 DEG C of-85 DEG C of temperature ranges.
Another object of the present invention is to it and a kind of new optical lens is provided further, it can utilize the light of larger wavelength coverage to realize the good imaging of large aperture, high pixel, little distortion, thus makes it is specially adapted to take into account day and night or lighting condition is poor monitoring and in-vehicle camera system.
Another object of the present invention is to it and provide a kind of new optical lens further, it under the precondition meeting low cost, miniaturization, in the temperature range of-40 DEG C-85 DEG C, can realize large aperture, high pixel, little distortion, good imaging.
Another object of the present invention is to it and provide a kind of new optical lens, wherein this optical lens does not need accurate parts and complicated structure, and its manufacturing process is simple, with low cost.
Other object of the present invention and feature are fully demonstrated by following detailed description and combination by the means specially pointed out in claims and device is achieved.
According to the present invention, the present invention includes of aforementioned object and other objects and advantage can be realized:
First lens, wherein these first lens have negative power;
Second lens, wherein these second lens have positive light coke;
3rd lens;
4th lens, wherein the 3rd lens and the 4th lens form an achromat group; With
5th lens, wherein said 5th lens have positive light coke, and wherein said 5th lens have two surfaces, and at least one surface in described two surfaces of described 5th lens is aspheric surface.
Another object of the present invention is to propose a kind of optical lens, can under the requirement condition meeting low cost, miniaturization, realize high pixel, little, large aperture of distorting, in the temperature range of-40 DEG C ~ 85 DEG C, still keep perfect imaging, be specially adapted to take into account day and night or monitoring that lighting condition is poor and in-vehicle camera system.
For reaching this object, the present invention by the following technical solutions:
A kind of optical lens, comprises from the object side to the image side successively: have the front lens group of positive light coke, aperture member, have the rear lens group of positive light coke;
Wherein, described front lens group comprises from the object side to the image side successively: the first lens, the second lens, and described first lens are the biconcave lens with negative power, and described second lens are the biconvex lens with positive light coke; Described rear lens group comprises from the object side to the image side successively: the 3rd lens, the 4th lens and the 5th lens, described 3rd lens and the 4th lens form a balsaming lens, described 5th lens are the aspheric mirror with positive light coke, and the shape of the 5th lens is two concave surface facing identical falcates.
Wherein, the 3rd lens in described balsaming lens have positive light coke and are biconvex shape, and the 4th lens in described balsaming lens have negative power and are concave-concave shape, two concave surface facing object spaces of described 5th lens.
Wherein, the 3rd lens in described balsaming lens have negative power and are concave-concave shape, and the 4th lens in described balsaming lens have positive light coke and are biconvex shape, two concave surface facing image spaces of described 5th lens.
Wherein, described first lens meet following formula:
Nd(1)≤1.8，Vd(1)≥40
Wherein, Nd (1) is the refractive index of the material of the first lens, and Vd (1) is the Abbe constant of the material of the first lens.
Preferably, described first lens meet following scope:
Nd(1)≤1.65，Vd(1)≥55
Wherein, described first lens meet following formula:
-0.9≥F1/F≥-2.0
Wherein, F1 is the focal length value of the first lens, and F represents whole group of focal length value of described optical lens.
Wherein, described second lens meet following formula:
Nd(2)≥1.73，Vd(2)≥40
Wherein, Nd (2) is the refractive index of the material of the second lens, and Vd (2) is the Abbe constant of the material of the second lens.
Wherein, whole group of focal length value of the focal length of described front lens group, the focal length of rear lens group and described optical lens meets following formula:
4.5 >=F (front)/F >=1.3 and 5 >=F (afterwards)/F >=1.5,
Further, 2.5 >=F (front)/F >=1.3,3 >=F (afterwards)/F >=1.5
Wherein, F (front) is the focal length value of front lens group, and F (afterwards) represents the focal length value of rear lens group, and F represents whole group of focal length value of described optical lens.
Wherein, described 5th lens meet following formula:
| r9-r10| < 2, and F5/F > 2
Wherein, r9 be the 5th lens thing side to radius value, r10 is the radius value in the 5th direction, lens image side, and F5 is the focal length value of the 5th lens, and F represents whole group of focal length value of described optical lens.
Wherein, the optical length of described optical lens meets the following conditions:
TTL/F≤6.5, further,
TTL/F≤4.5
Wherein, TTL represents the optical length of described optical lens, and namely the object space side outermost point of the first lens of described optical lens is to the distance of imaging focal plane of described optical lens, and F represents whole group of focal length value of described optical lens;
The f-number FNO of described optical lens meets following formula:
FNO≤1.8
Total field angle FOV of described optical lens meets following formula:
80°≥FOV≥40°
The maximum clear aperture of described first lens and the field angle of corresponding imaging image height and described optical lens meet following formula:
D/h/FOV≤0.025
Wherein, FOV represents the maximum field of view angle of described optical lens, and d represents the maximum clear aperture of the first lens corresponding to maximum FOV towards the concave surface of object space, and h represents the imaging image height corresponding to maximum FOV.
Wherein, described first lens, the second lens, the 3rd lens and the 4th lens are spherical glass eyeglass, and described 5th lens are plastic aspherical element eyeglass.
Wherein, described first lens, the second lens are spherical glass eyeglass, and described 3rd lens, the 4th lens and the 5th lens are plastic aspherical element eyeglass.
Beneficial effect:
A kind of optical lens of the present invention, by adopting the design of 5 lens structures and aspherical lens, can under the requirement condition meeting low cost, miniaturization, realize high pixel, little, the large aperture of distorting, high pass optical property and meet high definition and require and effectively correct the various aberrations of optical system, can ensure still to keep more perfect imaging definition in the temperature range of-40 DEG C ~+85 DEG C, be specially adapted to take into account day and night or monitoring that lighting condition is poor and in-vehicle camera system.
By the understanding to description subsequently and accompanying drawing, further aim of the present invention and advantage will be fully demonstrated.
These and other objects of the present invention, characteristics and advantages, by following detailed description, accompanying drawing and claim are fully demonstrated.
Accompanying drawing explanation
Fig. 1 is the structural representation of the optical lens according to the present invention first preferred embodiment.
Fig. 2 is the MTF solution image curve according to the optical lens of the invention described above first preferred embodiment.
Fig. 3 is the astigmatism curve map of the optical lens according to the invention described above first preferred embodiment.
Fig. 4 is the distortion curve figure of the optical lens according to the invention described above first preferred embodiment.
Fig. 5 is the structural representation according to the present invention second preferred embodiment.
Fig. 6 is the MTF solution image curve according to the optical lens of the invention described above second preferred embodiment.
Fig. 7 is the astigmatism curve map of the optical lens according to the invention described above second preferred embodiment.
Fig. 8 is the distortion curve figure of the optical lens according to the invention described above second preferred embodiment.
Fig. 9 is the structural representation of the optical lens according to the present invention the 3rd preferred embodiment.
Figure 10 is the MTF solution image curve according to the optical lens of the invention described above the 3rd preferred embodiment.
Figure 11 is the astigmatism curve map of the optical lens according to the invention described above the 3rd preferred embodiment.
Figure 12 is the distortion curve figure of the optical lens according to the invention described above the 3rd preferred embodiment.
Figure 13 is the structural representation according to the present invention the 4th preferred embodiment.
Figure 14 is the MTF solution image curve according to the optical lens of the invention described above the 4th preferred embodiment.
Figure 15 is the astigmatism curve map of the optical lens according to the invention described above the 4th preferred embodiment.
Figure 16 is the distortion curve figure of the optical lens according to the invention described above the 4th preferred embodiment.
Wherein in Fig. 1 to Figure 16:
L1-first lens; L2-second lens; L3-the 3rd lens; L4-the 4th lens; L5-the 5th lens; L6-aperture member; L7-color filter; L8-imaging surface; S1, S2-first two sides of lens; S3, S4-second two sides of lens; S5 – aperture member face; S6, S7-the 3rd two sides of lens; S7, S8-the 4th two sides of lens; S9, S10-the 5th two sides of lens; The two sides of S11, S12-color filter.
Figure 17 is the structural representation of the optical lens according to the present invention the 5th preferred embodiment.
Figure 18 is the MTF solution image curve according to the optical lens of the invention described above the 5th preferred embodiment.
Figure 19 is the astigmatism curve map of the optical lens according to the invention described above the 5th preferred embodiment.
Figure 20 is the distortion curve figure of the optical lens according to the invention described above the 5th preferred embodiment.
Figure 21 is the structural representation of the optical lens according to the present invention the 6th preferred embodiment.
Figure 22 is the MTF solution image curve according to the optical lens of the invention described above the 6th preferred embodiment.
Figure 23 is the astigmatism curve map of the optical lens according to the invention described above the 6th preferred embodiment.
Figure 24 is the distortion curve figure of the optical lens according to the invention described above the 6th preferred embodiment.
Figure 25 is the structural representation of the optical lens according to the present invention the 7th preferred embodiment.
Figure 26 is the MTF solution image curve according to the optical lens of the invention described above the 7th preferred embodiment.
Figure 27 is the astigmatism curve map of the optical lens according to the invention described above the 7th preferred embodiment.
Figure 28 is the distortion curve figure of the optical lens according to the invention described above the 7th preferred embodiment.
Figure 29 is the structural representation of the optical lens according to the present invention the 8th preferred embodiment.
Figure 30 is the MTF solution image curve according to the optical lens of the invention described above the 8th preferred embodiment.
Figure 31 is the astigmatism curve map of the optical lens according to the invention described above the 8th preferred embodiment.
Figure 32 is the distortion curve figure of the optical lens according to the invention described above the 8th preferred embodiment.
Figure 33 is the structural representation of the optical lens according to the present invention the 9th preferred embodiment.
Figure 34 is the MTF solution image curve according to the optical lens of the invention described above the 9th preferred embodiment.
Figure 35 is the astigmatism curve map of the optical lens according to the invention described above the 9th preferred embodiment.
Figure 36 is the distortion curve figure of the optical lens according to the invention described above the 9th preferred embodiment.
Embodiment
Following description is disclosed to make those skilled in the art can manufacture and use the present invention.The preferred embodiment provided in following description is only as the example that it will be apparent to those skilled in the art and amendment, and it does not form limitation of the scope of the invention.The General Principle defined in following description is applied to other embodiment, optionally substitutes with can not deviating from the present invention's spirit and invention scope, amendment, equivalent implement and apply.
Shown in Fig. 1 to Fig. 4 of reference accompanying drawing of the present invention, optical imaging lens according to the present invention first preferred embodiment is illustrated, wherein this optical imaging lens comprises at least one first lens L1, at least one second lens L2, a 3rd lens L3, 4th lens L4 and a 5th lens L5, wherein these first lens L1 has negative power, these second lens L2 has positive light coke, 3rd lens L3 and the 4th lens L4 forms an achromat group, 5th lens L5 is for having positive light coke, and the 5th lens L5 has at least one aspheric surface.In other words, the 5th lens L5 is aspheric mirror.Preferably, the 3rd lens L3 and/or the 4th lens L4 is aspheric mirror.More preferably, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are aspheric mirror, to improve the optical property of the optical imaging lens according to the present invention first preferred embodiment.Alternatively, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are spherical mirror.
As shown in Fig. 1 of accompanying drawing, these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 form a front lens group and a rear lens group, wherein this front lens group at least comprises the first lens L1, this rear lens group at least comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5, and wherein this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.In other words, this front lens group can be formed by these first lens L1, also can be formed by these first lens L1 and these second lens L2, wherein when this front lens group is formed by these first lens L1, this rear lens group comprises these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5; When this front lens group is formed by these first lens L1 and these second lens L2, this rear lens group comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5.As shown in Fig. 1 of accompanying drawing, this front lens group can be formed by these first lens L1, these second lens L2, and this rear lens group is formed by the 3rd lens L3, the 4th lens L4 and the 5th lens L5.Preferably, this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.More preferably, these first lens L1 of this front lens group, these second lens L2, and this achromat group of this rear lens group is sequentially set in direction from the object side to the image side with the 5th lens L5 edge.
As shown in Fig. 1 of accompanying drawing, the photocentre according to these first lens L1 of the optical imaging lens of the present invention first preferred embodiment, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.
As shown in Fig. 1 of accompanying drawing, optical imaging lens according to the present invention first preferred embodiment comprises a diaphragm L6 further, wherein front lens group and rear lens group can be set up and lay respectively at this diaphragm L6 both sides, and wherein the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.Preferably, this diaphragm L6 is arranged between this first lens L1 and these second lens L2.Alternatively, this diaphragm L6 is arranged between this second lens L2 and the 3rd lens L3.
Alternatively, this diaphragm L6 is arranged on this rear lens group, and the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.In certain embodiments, this diaphragm L6 also can be arranged between this achromat group and the 5th lens L5.Further, this diaphragm L6 also can be arranged on this achromat group, as being arranged on the 3rd lens L3 or the 4th lens L4.In further embodiments, this diaphragm L6 is arranged between this front lens group and this rear lens group.
Be understandable that, the concave-concave shape of these first lens L1 makes the optical imaging lens of the present invention first preferred embodiment have a larger aperture, is beneficial to the front end optic diameter reducing this optical imaging lens, thus meets small form factor requirements and reduce costs.Especially, when this diaphragm L6 is arranged on this first lens L1 and these second lens L2, the concave-concave shape of these first lens L1 allows the imaging within the scope of greater angle to pass through this diaphragm L6.Meanwhile, these second lens L2 has positive light coke, thus is beneficial to the light (refer to and penetrate from these first lens L1 the light come) converging front and disperse, to be conducive to the rectification of aberration.
Further, the focal length of these first lens L1 is F1, and the focal length according to the optical imaging lens of the present invention first preferred embodiment is F, then-0.9 >=F1/F >=-2, as shown in Table 1 and Table 2.
As shown in Fig. 1 of accompanying drawing, these first lens L1 according to the optical imaging lens of the present invention first preferred embodiment has two concave surfaces S1, S2, these second lens L2 has two convex surfaces S4, S5, wherein two concave surfaces S1, S2 of these first lens L1 are respectively towards object space and image space, and two convex surfaces S4, S5 of these second lens L2 are respectively towards object space and image space.As shown in Fig. 1 of accompanying drawing, these first lens L1 is configured to make its concave surface S1 towards object space, and this concave surface S2 is towards image space, and these second lens L2 is configured to make its convex surface S4 towards object space, and this convex surface S5 is towards image space.
As shown in Fig. 1 of accompanying drawing, further, the 3rd lens L3 according to the optical imaging lens of the present invention first preferred embodiment has two convex surfaces S6, S7,4th lens L4 has two concave surfaces S7, S8, wherein two convex surfaces S6, S7 of the 3rd lens L3 are respectively towards object space and image space, two concave surfaces S7, S8 of 4th lens L4 are respectively towards object space and image space, and wherein the 3rd lens L3 is set up towards the convex surface S7 of image space and the 4th lens L4 towards the concave surface S7 of object space opposite of practising physiognomy.In other words, the convex surface S7 of the 3rd lens L3 and the concave surface S7 of the 4th lens coincides, and therefore, this surperficial S7 can be considered to the convex surface S7 of the 3rd lens L3, also can be the concave surface S7 of the 4th lens L4.Correspondingly, two-sided lens is according to these first lens L1 of the optical imaging lens of the present invention first preferred embodiment, these second lens L2, the 3rd lens L3 and the 4th lens L4.As shown in Fig. 1 of accompanying drawing, the 3rd lens L3 is configured to make its convex surface S6 towards object space, and this convex surface S7 is towards image space, and the 4th lens L4 is configured to make its concave surface S7 towards object space, and this concave surface S8 is towards image space.Therefore, these first lens L1 is a biconcave lens, and these second lens L2 is a biconvex lens, and the 3rd lens L3 is a biconvex lens, and the 4th lens L4 is a biconcave lens.As shown in Fig. 1 of accompanying drawing, the 5th lens L5 according to the optical imaging lens of the present invention first preferred embodiment has two surperficial S9, S10, wherein two surperficial S9, S10 of the 5th lens L5 are respectively towards object space and image space, and at least one in two surperficial S9, S10 of wherein the 5th lens L5 is aspheric surface.In other words, the 5th lens L5 is two-sided lens, and has at least one aspheric surface.Preferably, a surperficial S9 of the 5th lens L5 is towards object space, and another surperficial S10 is towards image space.More preferably, two surperficial S9, S10 of the 5th lens L5 are respectively a convex surface and a concave surface, and such as the surperficial S9 of the 5th lens L5 is concave surface, and surperficial S10 is convex surface.
As shown in Fig. 1 of accompanying drawing, this achromat group according to the optical imaging lens of the present invention first preferred embodiment is preferably balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Now, because the 3rd lens L3 and the 4th lens L4 is glued together, therefore, together with the convex surface S7 of the 3rd lens L3 coincides with the concave surface S7 of the 4th lens L4.Now, the convex surface S7 of the 3rd lens L3 and the concave surface S7 of the 4th lens L4 is set up opposite of practising physiognomy.Alternatively, this achromat group also can be two divergence type achromat groups.Be understandable that, when this achromat group is two divergence type achromat group, the 3rd lens L3 and the 4th lens L4 is set up separately, then this diaphragm L6 can be arranged between the 3rd lens L3 and the 4th lens L4.
It should be noted that these first lens L1 can be made up of glass material, the material that also can have good light permeability energy by other is made.It will be appreciated by those skilled in the art that, when the refractive index of these first lens L1 is too high, then imaging is by after these first lens L1, can be dispersed excessive, so that subsequent lens, as the second lens L2 have to be configured to have a high index of refraction, heavy caliber and/or comparatively heavy thickness to converge light.Therefore, these the first lens L1 according to the optical imaging lens of the present invention first preferred embodiment is set to have a refractive index Nd (1)≤1.8.Preferably, the refractive index Nd (1)≤1.65 of these first lens L1, to avoid imaging too to disperse, as shown in table 1.In other words, when the refractive index making the material of these first lens L1 is not more than 1.65, effect is better.In addition, in order to avoid imaging is excessive by the aberration after these first lens L1, these first lens L1 be set up by the material of Abbe constant Vd (1) >=40 make.Preferably, these first lens L1 is made up of the material of Abbe constant Vd (1) >=55, as shown in table 1.In order to converge by the imaging of these first lens L1 and dispersing further of suppression imaging, to make to be transferred to this rear lens group reposefully by the imaging of these first lens L1, then these second lens L2 is set up and has higher refractive index, therefore, the refractive index of these second lens L2 is Nd (2), and Nd (2) >=1.73, as shown in table 1.In other words, the refractive index making the material of these second lens L2 is not less than 1.73.In addition, the Abbe constant of these second lens L2 is Vd (2), and Vd (2) >=40.Preferably, 65 >=Vd (2) >=40, effectively to correct the axial chromatic aberation of imaging, as shown in Table 1 and Table 2.Therefore, these first lens L1 and these second lens L2 all can be made up of more cheap glass material.
Fig. 1 as accompanying drawing is the structural representation of a kind of optical lens that the specific embodiment of the invention provides.As shown in Figure 1, Fig. 1 is the structural representation of a kind of optical lens that the specific embodiment of the invention provides.As shown in Figure 1, a kind of optical lens of the present invention, comprises from the object side to the image side successively: have the front lens group of positive light coke, aperture member L6, the rear lens group with positive light coke, color filter L7, imaging surface L8,
Wherein, described front lens group comprises from the object side to the image side successively: the first lens L1, the second lens L2, and described first lens L1 is the biconcave lens with negative power, and described second lens L2 is the biconvex lens with positive light coke; Described rear lens group comprises from the object side to the image side successively: the 3rd lens L3, the 4th lens L4 and the 5th lens L5, described 3rd lens L3 and the 4th lens L4 forms a balsaming lens, described 5th lens L5 is the aspheric mirror with positive light coke, and the shape of the 5th lens L5 is two concave surface facing identical falcates.
Wherein, preferably, described 5th lens L5 is plastic aspherical element eyeglass.5th lens L5 adopts plastic material, can alleviate the weight of described optical lens, and reduce costs.
The 3rd lens L3 in described balsaming lens has positive light coke and is biconvex shape, and the 4th lens L4 in described balsaming lens has negative power and is concave-concave shape, two concave surface facing object spaces of described 5th lens L5.
In the present embodiment, described first lens L1 meets following formula:
Nd(1)≤1.65，Vd(1)≥55
Wherein, Nd (1) is the refractive index of the material of the first lens L1, and Vd (1) is the Abbe constant of the material of the first lens L1.Lower refractive index can avoid the light of being come by object space after concave-concave (or crescent moon) lens as the 5th lens light disperse excessive.Meanwhile, described first lens L1 meets following formula:
-0.9≥F1/F≥-2.0
Wherein, F1 is the focal length value of the first lens L1, and F represents whole group of focal length value of described optical lens.Thereby, it is possible to make the physical dimension of the first lens L1 and the aberration of whole optical lens system reach a balance preferably.
In the present embodiment, described second lens L2 meets following formula:
Nd(2)≥1.73，Vd(2)≥40
Wherein, Nd (2) is the refractive index of the material of the second lens L2, and Vd (2) is the Abbe constant of the material of the second lens L2.Use the second eyeglass of high index of refraction, realize the light that object space comes further and can be transitioned into rear lens group stably, and ensureing the large aperture performance of described optical lens, Vd (2) >=40 effectively can correct the axial chromatic aberation of optical lens system.
Whole group of focal length value of the focal length of described front lens group, the focal length of rear lens group and described optical lens meets following formula:
2.5 >=F (front)/F >=1.3,3 >=F (afterwards)/F >=1.5
Wherein, F (front) is the focal length value of front lens group, and F (afterwards) represents the focal length value of rear lens group, and F represents whole group of focal length value of described optical lens.Reasonably distributed by the ratio of the focal power to front lens group, rear lens group, on the one hand can effective Jiao after the effective aperture of control both optical camera lens front end and the optics of optical lens; Effectively can eliminate senior aberration and the distortion aberration of optical lens system on the other hand.
In the present embodiment, described 5th lens L5 meets following formula:
| r9-r10| < 2, and F5/F > 2
Wherein, r9 be the 5th lens L5 thing side to radius value, r10 is the radius value in the 5th direction, lens L5 image side, and F5 is the focal length value of the 5th lens L5, and F represents whole group of focal length value of described optical lens.Adopted close to concentrically ringed eyeglass by last eyeglass in the light path of optical lens i.e. the 5th lens L5, and be aspheric surface, control this eyeglass is low power (focal length is long) simultaneously, light in the end can be converged effectively stably, the aberration of correcting system, particularly controls the distortion of camera lens.Simultaneously because aspheric surface made by this eyeglass, there is not the problem of traditional spherical concentric circle difficult processing.
The aspherical mirror of described 5th lens L5 meets following formula:
Wherein, Z (h) for aspheric surface along optical axis direction when being highly the position of h, apart from the distance rise on aspheric surface summit, c=1/r, r represent the radius-of-curvature of aspherical mirror, and k is circular cone coefficient conic, and A, B, C, D, E are high order aspheric surface coefficient.
Further, the optical length of described optical lens meets the following conditions:
TTL/F≤4.5
Wherein, TTL represents the optical length of described optical lens, and namely the object space side outermost point of the first lens L1 of described optical lens is to the distance of imaging focal plane of described optical lens, and F represents whole group of focal length value of described optical lens;
The f-number FNO of described optical lens meets following formula:
FNO≤1.8
Total field angle FOV of described optical lens meets following formula:
80°≥FOV≥40°
The maximum clear aperture of described first lens L1 and the field angle of corresponding imaging image height and described optical lens meet following formula:
D/h/FOV≤0.025
Wherein, FOV represents the maximum field of view angle of described optical lens, and d represents the maximum clear aperture of the first lens L1 corresponding to maximum FOV towards the concave surface of object space, and h represents the imaging image height corresponding to maximum FOV.
Preferably, described first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 are spherical glass eyeglass, and described 5th lens L5 is plastic aspherical element eyeglass.
Fig. 2-Fig. 4 is the optical performance curve figure of the present embodiment.Wherein, Fig. 2 is the MTF solution image curve of optical lens in Fig. 1; Fig. 3 is the astigmatism curve map of optical lens in Fig. 1, is represented by the wavelength of three coloured light commonly used, and unit is mm; Fig. 4 is the distortion curve figure of optical lens in Fig. 1, and represent the distortion sizes values after normalization in different field angle situation, unit is %.From Fig. 2-Fig. 4, embody this camera lens and there is good optical property.
As shown in following table 1 and table 2, in the present embodiment, whole group of focal length value of this optical lens is F, and f-number is FNO, and field angle is FOV, and camera lens overall length is TTL, F=4.8mm, FNO=1.8, FOV=58 °, TTL=18.3mm.
It should be noted that, the two sides of the first lens is S1, S2, and the two sides of the second lens is S3, S4, aperture member face is S5, and the two sides of the 3rd lens is S6, S7, and the two sides of the 4th lens is S7, S8, the two sides of the 5th lens is S9, S10, and the two sides of color filter is S11, S12; Face sequence number one_to_one corresponding in described S1-S12 and following table, wherein, IMA is expressed as the image planes of image planes L8.
Following table 1 is the parameter of the system of the described optical lens of the present embodiment:
| Face sequence number | Radius-of-curvature r | Center thickness d | Refractive index Nd | Abbe constant Vd | Effective aperture D |
| 1 | -13.11 | 0.8 | 1.5168 | 64.17 | 6.21 |
| 2 | 4.08 | 2.91207 | 5.22 | ||
| 3 | 8.68 | 4.53 | 1.8040 | 46.57 | 5.54 |
| 4 | -8.99 | 0.3 | 4.73 | ||
| 5 | Infinity | -0.25 | 4.05 | ||
| 6 | 6.94 | 2.9 | 1.8040 | 46.57 | 4.05 |
| 7 | -4.2 | 0.6 | 1.8466 | 23.83 | 3.53 |
| 8 | 7.95 | 1.142021 | 3.33 | ||
| 9 | -3.9 | 1.8 | 1.5119 | 56.29 | 3.48 |
| 10 | -2.67 | 0.1 | 4.37 | ||
| 11 | Infinity | 0.55 | 1.5168 | 64.17 | 4.53 |
| 12 | Infinity | 3.168352 | 4.58 | ||
| IMA | Infinity | 5.10 |
That following table 2 is listed is asphericity coefficient K, A, B, C, D, E:
According to above-mentioned data, the numerical value calculating formula involved in the present embodiment is as follows:
| r9-r10|=1.23, F5/F=2.35, F (front)/F=1.84, F (afterwards)/F=2.4, TTL/F=3.8, D/h/FOV=0.02.As shown in Table 1 and Table 2, in the present embodiment, as one group of concrete example parameter, adopt the optical lens of this parameter, better optical property can be reached.
In sum, a kind of optical lens of the present invention, by adopting the design of 5 lens structures and aspherical lens, can under the requirement condition meeting low cost, miniaturization, realize high pixel, little, the large aperture of distorting, high pass optical property and meet high definition and require and effectively correct the various aberrations of optical system, can ensure still to keep more perfect imaging definition in the temperature range of-40 DEG C ~+85 DEG C, be specially adapted to take into account day and night or monitoring that lighting condition is poor and in-vehicle camera system.
Shown in Fig. 5 to Fig. 8 of reference accompanying drawing of the present invention, optical imaging lens according to the present invention second preferred embodiment is illustrated, wherein this optical imaging lens comprises at least one first lens L1, at least one second lens L2, a 3rd lens L3, 4th lens L4 and a 5th lens L5, wherein these first lens L1 has negative power, these second lens L2 has positive light coke, 3rd lens L3 and the 4th lens L4 forms an achromat group, 5th lens L5 is for having positive light coke, and the 5th lens L5 has at least one aspheric surface.In other words, the 5th lens L5 is aspheric mirror.Preferably, the 3rd lens L3 and/or the 4th lens L4 is aspheric mirror.As shown in Figure 5, these first lens L1, these second lens L2 can be set to spherical glass eyeglass, and the 3rd lens L3, the 4th lens L4 and the 5th lens L5 can be set to plastic aspherical element eyeglass.More preferably, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are aspheric mirror, to improve the optical property of the optical imaging lens according to the present invention second preferred embodiment.
Alternatively, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are spherical mirror.
As shown in Fig. 5 of accompanying drawing, these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 form a front lens group and a rear lens group, wherein this front lens group at least comprises the first lens L1, this rear lens group at least comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5, and wherein this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.In other words, this front lens group can be formed by these first lens L1, also can be formed by these first lens L1 and these second lens L2, wherein when this front lens group is formed by these first lens L1, this rear lens group comprises these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5; When this front lens group is formed by these first lens L1 and these second lens L2, this rear lens group comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5.As shown in Fig. 5 of accompanying drawing, this front lens group can be formed by these first lens L1 and these second lens L2, and this rear lens group can be formed by the 3rd lens L3, the 4th lens L4 and the 5th lens L5.Preferably, this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.More preferably, these first lens L1 of this front lens group, these second lens L2, and this achromat group of this rear lens group is sequentially set in direction from the object side to the image side with the 5th lens L5 edge.
As shown in Fig. 5 of accompanying drawing, the photocentre according to these first lens L1 of the optical imaging lens of the present invention second preferred embodiment, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.
As shown in Fig. 5 of accompanying drawing, optical imaging lens according to the present invention second preferred embodiment comprises a diaphragm L6 further, wherein front lens group and rear lens group can be set up and lay respectively at this diaphragm L6 both sides, and wherein the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.Preferably, this diaphragm L6 is arranged between this first lens L1 and these second lens L2.Alternatively, this diaphragm L6 is arranged between this second lens L2 and the 3rd lens L3.
Alternatively, this diaphragm L6 is arranged on this rear lens group, and the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.In certain embodiments, this diaphragm L6 also can be arranged between this achromat group and the 5th lens L5.Further, this diaphragm L6 also can be arranged on this achromat group, as being arranged on the 3rd lens L3 or the 4th lens L4.In further embodiments, this diaphragm L6 is arranged between this front lens group and this rear lens group.
Be understandable that, the concave-concave shape of these first lens L1 makes the optical imaging lens of the present invention second preferred embodiment have a larger aperture, is beneficial to the front end optic diameter reducing this optical imaging lens, thus meets small form factor requirements and reduce costs.Especially, when this diaphragm L6 is arranged on this first lens L1 and these second lens L2, the concave-concave shape of these first lens L1 allows the imaging within the scope of greater angle to pass through this diaphragm L6.Meanwhile, these second lens L2 has positive light coke, thus is beneficial to the light (refer to and penetrate from these first lens L1 the light come) converging front and disperse, to be conducive to the rectification of aberration.
Further, the focal length of these first lens L1 is F1, and the focal length according to the optical imaging lens of the present invention second preferred embodiment is F, then-0.9 >=F1/F >=-2, as shown in Table 3 and Table 4.
As shown in Fig. 5 of accompanying drawing, these first lens L1 according to the optical imaging lens of the present invention second preferred embodiment has two concave surfaces S1, S2, these second lens L2 has two convex surfaces S4, S5, wherein two concave surfaces S1, S2 of these first lens L1 are respectively towards object space and image space, and two convex surfaces S4, S5 of these second lens L2 are respectively towards object space and image space.As shown in Fig. 5 of accompanying drawing, these first lens L1 is configured to make its concave surface S1 towards object space, and this concave surface S2 is towards image space, and these second lens L2 is configured to make its convex surface S4 towards object space, and this convex surface S5 is towards image space.
As shown in Fig. 5 of accompanying drawing, further, the 3rd lens L3 according to the optical imaging lens of the present invention second preferred embodiment has two concave surfaces S6, S7,4th lens L4 has two convex surfaces S7, S8, wherein two concave surfaces S6, S7 of the 3rd lens L3 are respectively towards object space and image space, two convex surfaces S7, S8 of 4th lens L4 are respectively towards object space and image space, and wherein the 3rd lens L3 is set up towards the concave surface S7 of image space and the 4th lens L4 towards the convex surface S7 of object space opposite of practising physiognomy.In other words, the concave surface S7 of the 3rd lens L3 and the convex surface S7 of the 4th lens coincides, and therefore, this surperficial S7 can be considered to the concave surface S7 of the 3rd lens L3, also can be the convex surface S7 of the 4th lens L4.Correspondingly, two-sided lens is according to these first lens L1 of the optical imaging lens of the present invention second preferred embodiment, these second lens L2, the 3rd lens L3 and the 4th lens L4.As shown in Fig. 5 of accompanying drawing, the 3rd lens L3 is configured to make its concave surface S6 towards object space, and this concave surface S7 is towards image space, and the 4th lens L4 is configured to make its convex surface S7 towards object space, and this convex surface S8 is towards image space.Therefore, these first lens L1 is a biconcave lens, and these second lens L2 is a biconvex lens, and the 3rd lens L3 is a biconcave lens, and the 4th lens L4 is a biconvex lens.As shown in Fig. 5 of accompanying drawing, the 5th lens L5 according to the optical imaging lens of the present invention second preferred embodiment has two surperficial S9, S10, wherein two surperficial S9, S10 of the 5th lens L5 are respectively towards object space and image space, and at least one in two surperficial S9, S10 of wherein the 5th lens L5 is aspheric surface.In other words, the 5th lens L5 is two-sided lens, and has at least one aspheric surface.Preferably, a surperficial S9 of the 5th lens L5 is towards object space, and another surperficial S10 is towards image space.More preferably, two surperficial S9, S10 of the 5th lens L5 are respectively a convex surface and a concave surface, and such as the surperficial S9 of the 5th lens L5 is convex surface, and surperficial S10 is concave surface.
As shown in Fig. 5 of accompanying drawing, this achromat group according to the optical imaging lens of the present invention second preferred embodiment is preferably balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Now, because the 3rd lens L3 and the 4th lens L4 is glued together, therefore, together with the concave surface S7 of the 3rd lens L3 coincides with the convex surface S7 of the 4th lens L4.Now, the concave surface S7 of the 3rd lens L3 and the convex surface S7 of the 4th lens L4 is set up opposite of practising physiognomy.Alternatively, this achromat group also can be two divergence type achromat groups.Be understandable that, when this achromat group is two divergence type achromat group, the 3rd lens L3 and the 4th lens L4 is set up separately, then this diaphragm L6 can be arranged between the 3rd lens L3 and the 4th lens L4.
It should be noted that these first lens L1 can be made up of glass material, the material that also can have good light permeability energy by other is made.It will be appreciated by those skilled in the art that, when the refractive index of these first lens L1 is too high, then imaging is by after these first lens L1, can be dispersed excessive, so that subsequent lens, as the second lens L2 have to be configured to have a high index of refraction, heavy caliber and/or comparatively heavy thickness to converge light.Therefore, the refractive index according to these first lens L1 of the optical imaging lens of the present invention second preferred embodiment is Nd (1), and Nd (1)≤1.8.Preferably, the refractive index Nd (1)≤1.65 of these first lens L1, to avoid imaging too to disperse, as shown in Table 3 and Table 4.In other words, the refractive index making the material of these first lens L1 is not more than 1.65.In addition, in order to avoid imaging is excessive by the aberration after these first lens L1, these first lens L1 is made up of the material of Abbe constant Vd (1) >=40.Preferably, these first lens L1 is made up of the material of Abbe constant Vd (1) >=55, as shown in table 3.In order to converge by the imaging of these first lens L1 and dispersing further of suppression imaging, to make to be transferred to this rear lens group reposefully by the imaging of these first lens L1, then these second lens L2 is set up and has higher refractive index, therefore, the refractive index of these second lens L2 is Nd (2), then Nd (2) >=1.73, as shown in table 3.In other words, the refractive index making the material of these second lens L2 is not less than 1.73.In addition, these second lens L2 is set up and is made up of the material of Abbe constant Vd (1) >=40.Preferably, 40≤Vd (2)≤65, effectively to correct the axial chromatic aberation of imaging, as shown in Table 3 and Table 4.Therefore, these first lens L1 and these second lens L2 all can be made up of more cheap glass material.
As the Fig. 5 to Fig. 8 of the accompanying drawing, with shown in table 3 to table 4, the difference of the present embodiment and the present invention first preferred embodiment is, the balsaming lens structure difference in the rear lens group in the present embodiment and two concave surface facing differences of the 5th lens L5.
Fig. 5 of accompanying drawing is the structural representation of the another kind of optical lens that the specific embodiment of the invention provides.As shown in Figure 5, a kind of optical lens of the present invention, comprises from the object side to the image side successively: have the front lens group of positive light coke, aperture member L6, the rear lens group with positive light coke, color filter L7, imaging surface L8;
Wherein, described front lens group comprises from the object side to the image side successively: the first lens L1, the second lens L2, and described first lens L1 is the biconcave lens with negative power, and described second lens L2 is the biconvex lens with positive light coke; Described rear lens group comprises from the object side to the image side successively: the 3rd lens L3, the 4th lens L4 and the 5th lens L5, described 3rd lens L3 and the 4th lens L4 forms a balsaming lens, described 5th lens L5 is the aspheric mirror with positive light coke, and the shape of the 5th lens L5 is two concave surface facing identical falcates.
Preferably, described 5th lens L5 is plastic aspherical element eyeglass.5th lens L5 adopts plastic material, can alleviate the weight of described optical lens, and reduce costs.
The 3rd lens L3 in described balsaming lens has negative power and is concave-concave shape, and the 4th lens L4 in described balsaming lens has positive light coke and is biconvex shape, two concave surface facing image spaces of described 5th lens L5.
In the present embodiment, described first lens L1 meets following formula:
Nd(1)≤1.65，Vd(1)≥55
Wherein, Nd (1) is the refractive index of the material of the first lens L1, and Vd (1) is the Abbe constant of the material of the first lens L1.Lower refractive index can avoid the light of being come by object space after concave-concave (or crescent moon) lens as the 5th lens light disperse excessive.Described first lens L1 meets following formula:
-0.9≥F1/F≥-2.0
Wherein, F1 is the focal length value of the first lens L1, and F represents whole group of focal length value of described optical lens.Thereby, it is possible to make the physical dimension of the first lens L1 and the aberration of whole optical lens system reach a balance preferably.
Described second lens L2 meets following formula:
Nd(2)≥1.73，Vd(2)≥40
Wherein, Nd (2) is the refractive index of the material of the second lens L2, and Vd (2) is the Abbe constant of the material of the second lens L2.Use the second eyeglass of high index of refraction, realize the light that object space comes further and can be transitioned into rear lens group stably, and ensureing the large aperture performance of described optical lens, Vd (2) >=40 effectively can correct the axial chromatic aberation of optical lens system.
Whole group of focal length value of the focal length of described front lens group, the focal length of rear lens group and described optical lens meets following formula:
2.5 >=F (front)/F >=1.3,3 >=F (afterwards)/F >=1.5
Wherein, F (front) is the focal length value of front lens group, and F (afterwards) represents the focal length value of rear lens group, and F represents whole group of focal length value of described optical lens.Reasonably distributed by the ratio of the focal power to front lens group, rear lens group, on the one hand can effective Jiao after the effective aperture of control both optical camera lens front end and the optics of optical lens; Effectively can eliminate senior aberration and the distortion aberration of optical lens system on the other hand.
Described 5th lens L5 meets following formula:
| r9-r10| < 2, and F5/F > 2
Wherein, r9 be the 5th lens L5 thing side to radius value, r10 is the radius value in the 5th direction, lens L5 image side, and F5 is the focal length value of the 5th lens L5, and F represents whole group of focal length value of described optical lens.Adopted close to concentrically ringed eyeglass by last eyeglass in the light path of optical lens i.e. the 5th lens L5, and be aspheric surface, control this eyeglass is low power (focal length is long) simultaneously, light in the end can be converged effectively stably, the aberration of correcting system, particularly controls the distortion of camera lens.Simultaneously because aspheric surface made by this eyeglass, there is not the problem of traditional spherical concentric circle difficult processing.
The aspherical mirror of described 5th lens L5 meets following formula:
Wherein, Z (h) for aspheric surface along optical axis direction when being highly the position of h, apart from the distance rise on aspheric surface summit, c=1/r, r represent the radius-of-curvature of aspherical mirror, and k is circular cone coefficient conic, and A, B, C, D, E are high order aspheric surface coefficient.
The optical length of described optical lens meets the following conditions:
TTL/F≤4.5
Wherein, TTL represents the optical length of described optical lens, and namely the object space side outermost point of the first lens L1 of described optical lens is to the distance of imaging focal plane of described optical lens, and F represents whole group of focal length value of described optical lens;
The f-number FNO of described optical lens meets following formula:
FNO≤1.8
Total field angle FOV of described optical lens meets following formula:
80°≥FOV≥40°
The maximum clear aperture of described first lens L1 and the field angle of corresponding imaging image height and described optical lens meet following formula:
D/h/FOV≤0.025
Wherein, FOV represents the maximum field of view angle of described optical lens, and d represents the maximum clear aperture of the first lens L1 corresponding to maximum FOV towards the concave surface of object space, and h represents the imaging image height corresponding to maximum FOV.
Preferably, described first lens L1, the second lens L2 are spherical glass eyeglass, and described 3rd lens L3, the 4th lens L4 and the 5th lens L5 are plastic aspherical element eyeglass.
Fig. 6-Fig. 8 is the optical performance curve figure of the present embodiment.Wherein, Fig. 6 is the MTF solution image curve of optical lens in Fig. 5; Fig. 7 is the astigmatism curve map of optical lens in Fig. 5, is represented by the wavelength of three coloured light commonly used, and unit is mm; Fig. 8 is the distortion curve figure of optical lens in Fig. 5, and represent the distortion sizes values after normalization in different field angle situation, unit is %.From Fig. 6-Fig. 8, embody this camera lens and there is good optical property.
As shown in following table 3 and table 4, in the present embodiment, whole group of focal length value of this optical lens is F, and f-number is FNO, and field angle is FOV, and camera lens overall length is TTL, F=4.68mm, FNO=1.8, FOV=58 °, TTL=19.87mm.
It should be noted that, the two sides of the first lens is S1, S2, the two sides of the second lens is S3, S4, and aperture member face is S5, and the two sides of the 3rd lens is S6, S7, the two sides of the 4th lens is S7, S8, the two sides of the 5th lens is S9, S10, and the two sides of color filter is S11, S12, the face sequence number one_to_one corresponding in described S1-S12 and following table, wherein, IMA is expressed as the image planes of image planes L8.
Following table 3 is the parameter of the system of the described optical lens of the present embodiment:
| Face sequence number | Radius-of-curvature r | Center thickness d | Refractive index Nd | Abbe constant Vd | Effective aperture D |
| 1 | -19.3808 | 1.0 | 1.5168 | 64.20 | 6 |
| 2 | 4.2627 | 3.713 | 5.95 | ||
| 3 | 6.3101 | 2.8 | 1.8040 | 46.57 | 5.95 |
| 4 | -21.6038 | 2.2805 | 5.95 | ||
| 5 | Infinity | 0.5165 | 3.26 | ||
| 6 | -4.5564 | 0.6 | 1.5825 | 30.15 | 3.32 |
| 7 | 2.0801 | 2.1673 | 1.5343 | 55.31 | 4.44 |
| 8 | -3.1304 | 0.1 | 4.74 | ||
| 9 | 5.2512 | 2.8 | 1.5116 | 56.82 | 4.94 |
| 10 | 6.2999 | 0.5 | 4.7 | ||
| 11 | Infinity | 0.55 | 1.5168 | 64.17 | 4.8 |
| 12 | Infinity | 2.8377 | 4.8 | ||
| IMA | Infinity | 4.8 |
That following table 4 is listed is asphericity coefficient K, A, B, C, D, E:
According to above-mentioned data, the numerical value calculating formula involved in the present embodiment is as follows:
| r9-r10|=1, F5/F=7, F (front)/F=1.63, F (afterwards)/F=2.08, TTL/F=4.2, D/h/FOV=0.022.
As shown in Table 3 and Table 4, in the present embodiment, as one group of concrete example parameter, adopt the optical lens of this parameter, better optical property can be reached.
In sum, a kind of optical lens of the present invention, by adopting the design of 5 lens structures and aspherical lens, can under the requirement condition meeting low cost, miniaturization, realize high pixel, little, the large aperture of distorting, high pass optical property and meet high definition and require and effectively correct the various aberrations of optical system, can ensure still to keep more perfect imaging definition in the temperature range of-40 DEG C ~+85 DEG C, be specially adapted to take into account day and night or monitoring that lighting condition is poor and in-vehicle camera system.
Shown in Fig. 9 to Figure 12 of reference accompanying drawing of the present invention, optical imaging lens according to the present invention the 3rd preferred embodiment is illustrated, wherein this optical imaging lens comprises at least one first lens L1, at least one second lens L2, a 3rd lens L3, 4th lens L4 and a 5th lens L5, wherein these first lens L1 has negative power, these second lens L2 has positive light coke, 3rd lens L3 and the 4th lens L4 forms an achromat group, 5th lens L5 is for having positive light coke, and the 5th lens L5 has at least one aspheric surface.In other words, the 5th lens L5 is aspheric mirror.Preferably, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are aspheric mirror, to improve the optical property of the optical imaging lens according to the present invention the 3rd preferred embodiment.Alternatively, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are spherical mirror.
As shown in Fig. 9 of accompanying drawing, these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 form a front lens group and a rear lens group, wherein this front lens group at least comprises the first lens L1, this rear lens group at least comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5, and wherein this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.In other words, this front lens group can be formed by these first lens L1, also can be formed by these first lens L1 and these second lens L2, wherein when this front lens group is formed by these first lens L1, this rear lens group comprises these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5; When this front lens group is formed by these first lens L1 and these second lens L2, this rear lens group comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5.As shown in Fig. 9 of accompanying drawing, this front lens group can be formed by these first lens L1, these second lens L2, and this rear lens group is formed by the 3rd lens L3, the 4th lens L4 and the 5th lens L5.Preferably, this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.More preferably, these first lens L1 of this front lens group, these second lens L2 of this rear lens group, and this achromat group is sequentially set in direction from the object side to the image side with the 5th lens L5 edge.
As shown in Fig. 9 of accompanying drawing, the photocentre according to these first lens L1 of the optical imaging lens of the present invention the 3rd preferred embodiment, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.
As shown in Fig. 9 of accompanying drawing, optical imaging lens according to the present invention the 3rd preferred embodiment comprises a diaphragm L6 further, wherein front lens group and rear lens group can be set up and lay respectively at this diaphragm L6 both sides, and wherein the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.Preferably, this diaphragm L6 is arranged between this first lens L1 and these second lens L2.Alternatively, this diaphragm L6 is arranged between this second lens L2 and the 3rd lens L3, as shown in Fig. 9 of accompanying drawing.
Alternatively, this diaphragm L6 is arranged on this rear lens group, and the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.In certain embodiments, this diaphragm L6 also can be arranged between this achromat group and the 5th lens L5.Further, this diaphragm L6 also can be arranged on this achromat group, as being arranged on the 3rd lens L3 or the 4th lens L4.In further embodiments, this diaphragm L6 is arranged between this front lens group and this rear lens group.
Be understandable that, the concave-concave shape of these first lens L1 makes the optical imaging lens of the present invention the 3rd preferred embodiment have a larger aperture, is beneficial to the front end optic diameter reducing this optical imaging lens, thus meets small form factor requirements and reduce costs.Especially, when this diaphragm L6 is arranged on this first lens L1 and these second lens L2, the concave-concave shape of these first lens L1 allows the imaging within the scope of greater angle to pass through this diaphragm L6.Meanwhile, these second lens L2 has positive light coke, thus is beneficial to the light (refer to and penetrate from these first lens L1 the light come) converging front and disperse, to be conducive to the rectification of aberration.
Further, the focal length of these first lens L1 is F1, and the focal length according to the optical imaging lens of the present invention the 3rd preferred embodiment is F, then-0.9 >=F1/F >=-2, as shown in table 5 and table 6.
As shown in Fig. 9 of accompanying drawing, these first lens L1 according to the optical imaging lens of the present invention the 3rd preferred embodiment has two concave surfaces S1, S2, these second lens L2 has two convex surfaces S4, S5, wherein two concave surfaces S1, S2 of these first lens L1 are respectively towards object space and image space, and two convex surfaces S4, S5 of these second lens L2 are respectively towards object space and image space.As shown in Fig. 9 of accompanying drawing, these first lens L1 is configured to make its concave surface S1 towards object space, and this concave surface S2 is towards image space, and these second lens L2 is configured to make its convex surface S4 towards object space, and this convex surface S5 is towards image space.
As shown in Fig. 9 of accompanying drawing, further, the 3rd lens L3 according to the optical imaging lens of the present invention the 3rd preferred embodiment has two convex surfaces S6, S7,4th lens L4 has two concave surfaces S7, S8, wherein two convex surfaces S6, S7 of the 3rd lens L3 are respectively towards object space and image space, two concave surfaces S7, S8 of 4th lens L4 are respectively towards object space and image space, and wherein the 3rd lens L3 is set up towards the convex surface S7 of image space and the 4th lens L4 towards the concave surface S7 of object space opposite of practising physiognomy.In other words, the convex surface S7 of the 3rd lens L3 and the concave surface S7 of the 4th lens coincides, and therefore, this surperficial S7 can be considered to the convex surface S7 of the 3rd lens L3, also can be the concave surface S7 of the 4th lens L4.Correspondingly, two-sided lens is according to these first lens L1 of the optical imaging lens of the present invention the 3rd preferred embodiment, these second lens L2, the 3rd lens L3 and the 4th lens L4.As shown in Fig. 9 of accompanying drawing, the 3rd lens L3 is configured to make its convex surface S6 towards object space, and this convex surface S7 is towards image space, and the 4th lens L4 is configured to make its concave surface S7 towards object space, and this concave surface S8 is towards image space.Therefore, these first lens L1 is a biconcave lens, and these second lens L2 is a biconvex lens, and the 3rd lens L3 is a biconvex lens, and the 4th lens L4 is a biconcave lens.As shown in Fig. 9 of accompanying drawing, the 5th lens L5 according to the optical imaging lens of the present invention the 3rd preferred embodiment has two surperficial S9, S10, wherein two surperficial S9, S10 of the 5th lens L5 are respectively towards object space and image space, and at least one in two surperficial S9, S10 of wherein the 5th lens L5 is aspheric surface.In other words, the 5th lens L5 is two-sided lens, and has at least one aspheric surface.Preferably, a surperficial S9 of the 5th lens L5 is towards object space, and another surperficial S10 is towards image space.More preferably, two surperficial S9, S10 of the 5th lens L5 are respectively a convex surface and a concave surface, and such as the surperficial S9 of the 5th lens L5 is concave surface, and surperficial S10 is convex surface.
As shown in Fig. 9 of accompanying drawing, this achromat group according to the optical imaging lens of the present invention the 3rd preferred embodiment is preferably balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Now, because the 3rd lens L3 and the 4th lens L4 is glued together, therefore, together with the convex surface S7 of the 3rd lens L3 coincides with the concave surface S7 of the 4th lens L4.Now, the convex surface S7 of the 3rd lens L3 and the concave surface S7 of the 4th lens L4 is set up opposite of practising physiognomy.Alternatively, this achromat group also can be two divergence type achromat groups.Be understandable that, when this achromat group is two divergence type achromat group, the 3rd lens L3 and the 4th lens L4 is set up separately, then this diaphragm L6 can be arranged between the 3rd lens L3 and the 4th lens L4.
It should be noted that these first lens L1 can be made up of glass material, the material that also can have good light permeability energy by other is made.It will be appreciated by those skilled in the art that, when the refractive index of these first lens L1 is too high, then imaging is by after these first lens L1, can be dispersed excessive, so that subsequent lens, as the second lens L2 have to be configured to have a high index of refraction, heavy caliber and/or comparatively heavy thickness to converge light.Therefore, according to the refractive index Nd (1)≤1.80 of these first lens L1 of the optical imaging lens of the present invention the 3rd preferred embodiment, to avoid imaging too to disperse, as shown in table 5.In other words, the refractive index making the material of these first lens L1 is not more than 1.8.In addition, in order to avoid imaging is excessive by the aberration after these first lens L1, the Abbe constant Vd (1) >=40 of the material of these first lens L1 is limited, as shown in table 5.In order to converge by the imaging of these first lens L1 and dispersing further of suppression imaging, to make to be transferred to this rear lens group reposefully by the imaging of these first lens L1, then these second lens L2 is set up and has higher refractive index, therefore, the refractive index of these second lens L2 is Nd (2), then Nd (2) >=1.73, as shown in table 5 and table 6.In other words, the refractive index making the material of these second lens L2 is not less than 1.73.In addition, these second lens L2 is set up has Abbe constant Vd (2), then Vd (2) >=40.Preferably, 40≤Vd (2)≤65, effectively to correct the axial chromatic aberation of imaging, as shown in table 5 and table 6.Therefore, these first lens L1 and these second lens L2 all can be made up of more cheap glass material.
As the Fig. 9 to Figure 12 of the accompanying drawing, shown in table 5 to table 6, the difference of the present embodiment and the present invention first preferred embodiment is, the design parameter of these the first lens L1 in the present embodiment, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5, especially these first lens L1 is different.Thus these first lens L1 can be made by having different performance material.
As the Fig. 9 to Figure 12 of the accompanying drawing, shown in table 5 to table 6, the optical lens according to the present invention the 3rd preferred embodiment comprises from the object side to the image side successively: have the front lens group of positive light coke, aperture member L6, the rear lens group with positive light coke, color filter L7, imaging surface L8;
Wherein, described front lens group comprises from the object side to the image side successively: the first lens L1, the second lens L2, and described first lens L1 is the biconcave lens with negative power, and described second lens L2 is the biconvex lens with positive light coke; Described rear lens group comprises from the object side to the image side successively: the 3rd lens L3, the 4th lens L4 and the 5th lens L5, described 3rd lens L3 and the 4th lens L4 forms a balsaming lens, described 5th lens L5 is the aspheric mirror with positive light coke, and the shape of the 5th lens L5 is two concave surface facing identical falcates.
Wherein, preferably, described 5th lens L5 is plastic aspherical element eyeglass.5th lens L5 adopts plastic material, can alleviate the weight of described optical lens, and reduce costs.
The 3rd lens L3 in described balsaming lens has positive light coke and is biconvex shape, and the 4th lens L4 in described balsaming lens has negative power and is concave-concave shape, two concave surface facing object spaces of described 5th lens L5.
In the present embodiment, described first lens L1 meets following formula:
Nd(1)≤1.8，Vd(1)≥40
Wherein, Nd (1) is the refractive index of the material of the first lens L1, and Vd (1) is the Abbe constant of the material of the first lens L1.Lower refractive index can avoid the light of being come by object space after concave-concave (or crescent moon) lens as the 5th lens light disperse excessive.Meanwhile, described first lens L1 meets following formula:
-0.9≥F1/F≥-2.0
Wherein, F1 is the focal length value of the first lens L1, and F represents whole group of focal length value of described optical lens.Thereby, it is possible to make the physical dimension of the first lens L1 and the aberration of whole optical lens system reach a balance preferably.
In the present embodiment, described second lens L2 meets following formula:
Nd(2)≥1.73，Vd(2)≥40
Wherein, Nd (2) is the refractive index of the material of the second lens L2, and Vd (2) is the Abbe constant of the material of the second lens L2.Use the second eyeglass of high index of refraction, realize the light that object space comes further and can be transitioned into rear lens group stably, and ensureing the large aperture performance of described optical lens, Vd (2) >=40 effectively can correct the axial chromatic aberation of optical lens system.
Whole group of focal length value of the focal length of described front lens group, the focal length of rear lens group and described optical lens meets following formula:
2.5 >=F (front)/F >=1.3,3 >=F (afterwards)/F >=1.5
Wherein, F (front) is the focal length value of front lens group, and F (afterwards) represents the focal length value of rear lens group, and F represents whole group of focal length value of described optical lens.Reasonably distributed by the ratio of the focal power to front lens group, rear lens group, on the one hand can effective Jiao after the effective aperture of control both optical camera lens front end and the optics of optical lens; Effectively can eliminate senior aberration and the distortion aberration of optical lens system on the other hand.
The aspherical mirror of described 5th lens L5 meets following formula:
Wherein, Z (h) for aspheric surface along optical axis direction when being highly the position of h, apart from the distance rise on aspheric surface summit, c=1/r, r represent the radius-of-curvature of aspherical mirror, and k is circular cone coefficient conic, and A, B, C, D, E are high order aspheric surface coefficient.
Preferably, described first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 are spherical glass eyeglass, and described 5th lens L5 is plastic aspherical element eyeglass.
Figure 10-Figure 12 is the optical performance curve figure of the present embodiment.Wherein, Figure 10 is the MTF solution image curve of optical lens in Fig. 9; Figure 11 is the astigmatism curve map of optical lens in Fig. 9, is represented by the wavelength of three coloured light commonly used, and unit is mm; Figure 12 is the distortion curve figure of optical lens in Fig. 9, and represent the distortion sizes values after normalization in different field angle situation, unit is %.From Figure 10-Figure 12, embody this camera lens and there is good optical property.
As shown in following table 5 and table 6, in the present embodiment, whole group of focal length value of this optical lens is F, and f-number is FNO, and field angle is FOV, and camera lens overall length is TTL, F=3.9mm, FNO=2.0, FOV=60 °, TTL=17.94mm.
It should be noted that, the two sides of the first lens is S1, S2, and the two sides of the second lens is S3, S4, aperture member face is S5, and the two sides of the 3rd lens is S6, S7, and the two sides of the 4th lens is S7, S8, the two sides of the 5th lens is S9, S10, and the two sides of color filter is S11, S12; Face sequence number one_to_one corresponding in described S1-S12 and following table, wherein, IMA is expressed as the image planes of image planes L8.
As shown in following table 5 and table 6, optical lens according to the present invention the 3rd preferred embodiment can be set to the radius-of-curvature of the concave surface S1 towards object space of these first lens L1 for-48.335 (from object spaces to image space), the radius-of-curvature of the concave surface S2 towards image space of these first lens L1 is 3.717 (from object spaces to image space), the refractive index of these first lens L1 is 1.71, and the Abbe constant of these first lens L1 is 53.8; The radius-of-curvature of the convex surface S4 towards object space of these second lens L2 is 5.950 (from object spaces to image space), the radius-of-curvature of the convex surface S5 towards image space of these second lens L2 is-7.570 (from object spaces to image space), the refractive index of these second lens L2 is 1.80, the Abbe constant of these second lens L2 is 46.6, MTF then according to the optical lens of the present invention the 3rd preferred embodiment separates image curve as shown in Figure 10, as shown in figure 11, the distortion curve figure of this optical lens as shown in figure 12 for the astigmatism curve map of this optical lens.Therefore, this optical lens has good optical property, as shown in Figure 10 to Figure 12 of accompanying drawing.
Following table 5 is the parameter of the system of the described optical lens of the present embodiment:
| Face sequence number | Radius-of-curvature r | Center thickness d | Refractive index Nd | Abbe constant Vd |
| 1 | -48.335 | 0.800 | 1.71 | 53.8 |
| 2 | 3.717 | 2.750 | ||
| 3 | 5.950 | 4.460 | 1.80 | 46.6 |
| 4 | -7.570 | 0.904 | ||
| STO | Infinity | -0.250 | ||
| 6 | 5.682 | 2.930 | 1.80 | 46.6 |
| 7 | -4.370 | 0.600 | 1.85 | 23.8 |
| 8 | 5.241 | 1.103 | ||
| 9 | -6.368 | 1.750 | 1.51 | 56.3 |
| 10 | -2.564 | 0.100 | ||
| 11 | Infinity | 0.950 | 1.52 | 64.2 |
| 12 | Infinity | 1.839 | ||
| IMA | Infinity |
That following table 6 is listed is asphericity coefficient K, A, B, C, D, E:
| Face sequence number | K | A | B | C | D | E |
| 9 | 5.133 | -1.60000E-03 | 9.70883E-04 | -2.96888E-04 | -5.85596E-05 | 3.68100E-06 |
| 10 | -3.2 | 2.04873E-03 | -1.39479E-03 | 4.74043E-04 | -7.24495E-05 | 6.32194E-06 |
At least one surface in two surfaces of the 5th lens L5 is aspheric surface, to improve solution picture and the imaging performance of optical lens entirety, thus makes the optical lens according to the present invention the 3rd preferred embodiment be suitable for being miniaturized and having better imaging performance.
As shown in table 5 and table 6, in the present embodiment, as one group of concrete example parameter, adopt the optical lens of this parameter, better optical property can be reached.
In sum, the optical lens according to the present invention the 3rd preferred embodiment under the prerequisite of high pixel, little distortion, high resolution imaging, can realize the miniaturization of whole optical lens, is suitable for being used in automotive field to make it.In addition, according to the optimum configurations of each lens of the optical lens of the present invention the 3rd preferred embodiment, it can be made to be set up and to adopt the insensitive material of temperature variation, as glass material is made, stablize to make its retention in the environment that temperature variation is larger.In other words, the optical lens of the present invention the 3rd preferred embodiment can be set up the lens combination with minimum five lens composition, to realize high pixel, little distortion, high resolution imaging, and this optical lens can be set up miniaturization and can be stable into picture in large-temperature range.
Therefore, optical lens according to the present invention the 3rd preferred embodiment can be set up the design of employing 5 lens structures and aspherical lens, can under the requirement condition meeting low cost, miniaturization, realize high pixel, little, the large aperture of distorting, high pass optical property and meet high definition and require and effectively correct the various aberrations of optical system, can ensure still to keep more perfect imaging definition in the temperature range of-40 DEG C ~+85 DEG C, be specially adapted to take into account day and night or monitoring that lighting condition is poor and in-vehicle camera system.
Shown in Figure 13 to Figure 16 of reference accompanying drawing of the present invention, optical imaging lens according to the present invention the 4th preferred embodiment is illustrated, wherein this optical imaging lens comprises at least one first lens L1, at least one second lens L2, a 3rd lens L3, 4th lens L4 and a 5th lens L5, wherein these first lens L1 has negative power, these second lens L2 has positive light coke, 3rd lens L3 and the 4th lens L4 forms an achromat group, 5th lens L5 is for having positive light coke, and the 5th lens L5 has at least one aspheric surface.In other words, the 5th lens L5 is aspheric mirror.Preferably, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are aspheric mirror, to improve the optical property of the optical imaging lens according to the present invention the 4th preferred embodiment.Alternatively, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are spherical mirror.
As shown in Figure 13 of accompanying drawing, these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 form a front lens group and a rear lens group, wherein this front lens group at least comprises the first lens L1, this rear lens group at least comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5, and wherein this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.In other words, this front lens group can be formed by these first lens L1, also can be formed by these first lens L1 and these second lens L2, wherein when this front lens group is formed by these first lens L1, this rear lens group comprises these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5; When this front lens group is formed by these first lens L1 and these second lens L2, this rear lens group comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5.As shown in Figure 13 of accompanying drawing, this front lens group can be formed by these first lens L1, these second lens L2, and this rear lens group is formed by the 3rd lens L3, the 4th lens L4 and the 5th lens L5.Preferably, this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.More preferably, these second lens L2 of these first lens L1 of this front lens group and this rear lens group, this achromat group and the 5th lens L5 are sequentially set along direction from the object side to the image side.
As shown in Figure 13 of accompanying drawing, the photocentre according to these first lens L1 of the optical imaging lens of the present invention the 4th preferred embodiment, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.
As shown in Figure 13 of accompanying drawing, optical imaging lens according to the present invention the 4th preferred embodiment comprises a diaphragm L6 further, wherein front lens group and rear lens group can be set up and lay respectively at this diaphragm L6 both sides, and wherein the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.Preferably, this diaphragm L6 is arranged between this first lens L1 and these second lens L2.Alternatively, this diaphragm L6 is arranged between this second lens L2 and the 3rd lens L3.
Alternatively, this diaphragm L6 is arranged on this rear lens group, and the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.In certain embodiments, this diaphragm L6 also can be arranged between this achromat group and the 5th lens L5.Further, this diaphragm L6 also can be arranged on this achromat group, as being arranged on the 3rd lens L3 or the 4th lens L4.In further embodiments, this diaphragm L6 is arranged between this front lens group and this rear lens group.
Be understandable that, the concave-concave shape of these first lens L1 makes the optical imaging lens of the present invention the 4th preferred embodiment have a larger aperture, is beneficial to the front end optic diameter reducing this optical imaging lens, thus meets small form factor requirements and reduce costs.Especially, when this diaphragm L6 is arranged on this first lens L1 and these second lens L2, the concave-concave shape of these first lens L1 allows the imaging within the scope of greater angle to pass through this diaphragm L6.Meanwhile, these second lens L2 has positive light coke, thus is beneficial to the light (refer to and penetrate from these first lens L1 the light come) converging front and disperse, to be conducive to the rectification of aberration.
Further, the focal length of these first lens L1 is F1, and the focal length according to the optical imaging lens of the present invention the 4th preferred embodiment is F, then-0.9 >=F1/F >=-2, as shown in table 7 and table 8.
As shown in Figure 13 of accompanying drawing, these first lens L1 according to the optical imaging lens of the present invention the 4th preferred embodiment has two concave surfaces S1, S2, these second lens L2 has two convex surfaces S4, S5, wherein two concave surfaces S1, S2 of these first lens L1 are respectively towards object space and image space, and two convex surfaces S4, S5 of these second lens L2 are respectively towards object space and image space.As shown in Figure 13 of accompanying drawing, these first lens L1 is configured to make its concave surface S1 towards object space, and this concave surface S2 is towards image space, and these second lens L2 is configured to make its convex surface S4 towards object space, and this convex surface S5 is towards image space.
As shown in Figure 13 of accompanying drawing, further, the 3rd lens L3 according to the optical imaging lens of the present invention the 4th preferred embodiment has two concave surfaces S6, S7,4th lens L4 has two convex surfaces S7, S8, wherein two concave surfaces S6, S7 of the 3rd lens L3 are respectively towards object space and image space, two convex surfaces S7, S8 of 4th lens L4 are respectively towards object space and image space, and wherein the 3rd lens L3 is set up towards the concave surface S7 of image space and the 4th lens L4 towards the convex surface S7 of object space opposite of practising physiognomy.In other words, the concave surface S7 of the 3rd lens L3 and the convex surface S7 of the 4th lens coincides, and therefore, this surperficial S7 can be considered to the concave surface S7 of the 3rd lens L3, also can be the convex surface S7 of the 4th lens L4.Correspondingly, two-sided lens is according to these first lens L1 of the optical imaging lens of the present invention the 4th preferred embodiment, these second lens L2, the 3rd lens L3 and the 4th lens L4.As shown in Figure 13 of accompanying drawing, the 3rd lens L3 is configured to make its concave surface S6 towards object space, and this concave surface S7 is towards image space, and the 4th lens L4 is configured to make its convex surface S7 towards object space, and this convex surface S8 is towards image space.Therefore, these first lens L1 is a biconcave lens, and these second lens L2 is a biconvex lens, and the 3rd lens L3 is a biconcave lens, and the 4th lens L4 is a biconvex lens.As shown in Figure 13 of accompanying drawing, the 5th lens L5 according to the optical imaging lens of the present invention the 4th preferred embodiment has two surperficial S9, S10, wherein two surperficial S9, S10 of the 5th lens L5 are respectively towards object space and image space, and at least one in two surperficial S9, S10 of wherein the 5th lens L5 is aspheric surface.In other words, the 5th lens L5 is two-sided lens, and has at least one aspheric surface.Preferably, a surperficial S9 of the 5th lens L5 is towards object space, and another surperficial S10 is towards image space.More preferably, two surperficial S9, S10 of the 5th lens L5 are respectively a convex surface and a concave surface, and such as the surperficial S9 of the 5th lens L5 is convex surface, and surperficial S10 is concave surface.As shown in Figure 13 of accompanying drawing, this achromat group according to the optical imaging lens of the present invention the 4th preferred embodiment is preferably balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Now, because the 3rd lens L3 and the 4th lens L4 is glued together, therefore, together with the concave surface S7 of the 3rd lens L3 coincides with the convex surface S7 of the 4th lens L4.Now, the concave surface S7 of the 3rd lens L3 and the convex surface S7 of the 4th lens L4 is set up opposite of practising physiognomy.Alternatively, this achromat group also can be two divergence type achromat groups.Be understandable that, when this achromat group is two divergence type achromat group, the 3rd lens L3 and the 4th lens L4 is set up separately, then this diaphragm L6 can be arranged between the 3rd lens L3 and the 4th lens L4.
It should be noted that these first lens L1 can be made up of glass material, the material that also can have good light permeability energy by other is made.It will be appreciated by those skilled in the art that, when the refractive index of these first lens L1 is too high, then imaging is by after these first lens L1, can be dispersed excessive, so that subsequent lens, as the second lens L2 have to be configured to have a high index of refraction, heavy caliber and/or comparatively heavy thickness to converge light.Therefore, according to the refractive index Nd (1)≤1.8 of these first lens L1 of the optical imaging lens of the present invention the 4th preferred embodiment, to avoid imaging too to disperse, as shown in table 7 and table 8.In other words, the refractive index making the material of these first lens L1 is not more than 1.8.In addition, in order to avoid imaging is excessive by the aberration after these first lens L1, the Abbe constant Vd (1) >=40 of the material of these first lens L1 is limited, as shown in table 7 and table 8.In order to converge by the imaging of these first lens L1 and dispersing further of suppression imaging, to make to be transferred to this rear lens group reposefully by the imaging of these first lens L1, then these second lens L2 is set up and has higher refractive index, therefore, the refractive index of these second lens L2 is Nd (2), then Nd (2) >=1.73, as shown in table 7 and table 8.In other words, the refractive index making the material of these second lens L2 is not less than 1.73.In addition, these second lens L2 is set up has Abbe constant Vd (2), then Vd (2) >=40, effectively to correct the axial chromatic aberation of imaging, as shown in table 7 and table 8.Therefore, these first lens L1 and these second lens L2 all can be made up of more cheap glass material.
As the Figure 13 to Figure 16 of the accompanying drawing, and shown in table 7 and table 8, the difference of the present embodiment and the present invention first preferred embodiment is, the balsaming lens structure difference in the rear lens group in the present embodiment and two concave surface facing differences of the 5th lens L5.
Figure 13 of accompanying drawing is the structural representation of the another kind of optical lens that the specific embodiment of the invention provides.As shown in figure 13, a kind of optical lens of the present invention, comprises from the object side to the image side successively: have the front lens group of positive light coke, aperture member L6, the rear lens group with positive light coke, color filter L7, imaging surface L8;
Wherein, described front lens group comprises from the object side to the image side successively: the first lens L1, the second lens L2, and described first lens L1 is the biconcave lens with negative power, and described second lens L2 is the biconvex lens with positive light coke; Described rear lens group comprises from the object side to the image side successively: the 3rd lens L3, the 4th lens L4 and the 5th lens L5, described 3rd lens L3 and the 4th lens L4 forms a balsaming lens, described 5th lens L5 is the aspheric mirror with positive light coke, and the shape of the 5th lens L5 is two concave surface facing identical falcates.
Preferably, described 5th lens L5 is plastic aspherical element eyeglass.5th lens L5 adopts plastic material, can alleviate the weight of described optical lens, and reduce costs.
The 3rd lens L3 in described balsaming lens has negative power and is concave-concave shape, and the 4th lens L4 in described balsaming lens has positive light coke and is biconvex shape, two concave surface facing image spaces of described 5th lens L5.
In the present embodiment, described first lens L1 meets following formula:
Nd(1)≤1.8，Vd(1)≥40
Wherein, Nd (1) is the refractive index of the material of the first lens L1, and Vd (1) is the Abbe constant of the material of the first lens L1.Lower refractive index can avoid the light of being come by object space after concave-concave (or crescent moon) lens as the 5th lens light disperse excessive.Described first lens L1 meets following formula:
-0.9≥F1/F≥-2.0
Wherein, F1 is the focal length value of the first lens L1, and F represents whole group of focal length value of described optical lens.Thereby, it is possible to make the physical dimension of the first lens L1 and the aberration of whole optical lens system reach a balance preferably.
Described second lens L2 meets following formula:
Nd(2)≥1.73，Vd(2)≥40
Wherein, Nd (2) is the refractive index of the material of the second lens L2, and Vd (2) is the Abbe constant of the material of the second lens L2.Use the second eyeglass of high index of refraction, realize the light that object space comes further and can be transitioned into rear lens group stably, and ensureing the large aperture performance of described optical lens, Vd (2) >=40 effectively can correct the axial chromatic aberation of optical lens system.
The aspherical mirror of described 5th lens L5 meets following formula:
Wherein, Z (h) for aspheric surface along optical axis direction when being highly the position of h, apart from the distance rise on aspheric surface summit, c=1/r, r represent the radius-of-curvature of aspherical mirror, and k is circular cone coefficient conic, and A, B, C, D, E are high order aspheric surface coefficient.
Preferably, described first lens L1, the second lens L2 are spherical glass eyeglass, and described 3rd lens L3, the 4th lens L4 and the 5th lens L5 are plastic aspherical element eyeglass.
Figure 14-Figure 16 is the optical performance curve figure of the present embodiment.Wherein, Figure 14 is the MTF solution image curve of optical lens in Figure 13; Figure 15 is the astigmatism curve map of optical lens in Figure 13, is represented by the wavelength of three coloured light commonly used, and unit is mm; Figure 16 is the distortion curve figure of optical lens in Figure 13, and represent the distortion sizes values after normalization in different field angle situation, unit is %.From Figure 14-Figure 16, embody this camera lens and there is good optical property.
It should be noted that, the two sides of the first lens is S1, S2, the two sides of the second lens is S3, S4, and aperture member face is S5, and the two sides of the 3rd lens is S6, S7, the two sides of the 4th lens is S7, S8, the two sides of the 5th lens is S9, S10, and the two sides of color filter is S11, S12, the face sequence number one_to_one corresponding in described S1-S12 and following table, wherein, IMA is expressed as the image planes of image planes L8.
As shown in following table 7 and table 8, optical lens according to the present invention the 4th preferred embodiment can be set to the radius-of-curvature of the concave surface S1 towards object space of these first lens L1 for-19.457 (from object spaces to image space), the radius-of-curvature of the concave surface S2 towards image space of these first lens L1 is 4.280 (from object spaces to image space), the refractive index of these first lens L1 is 1.75, and the Abbe constant of these first lens L1 is 52.3; The radius-of-curvature of the convex surface S4 towards object space of these second lens L2 is 6.313 (from object spaces to image space), the radius-of-curvature of the convex surface S5 towards image space of these second lens L2 is-21.612 (from object spaces to image space), the refractive index of these second lens L2 is 1.80, the Abbe constant of these second lens L2 is 46.57, MTF then according to the optical lens of the present invention the 4th preferred embodiment separates image curve as shown in figure 14, as shown in figure 15, the distortion curve figure of this optical lens as shown in figure 16 for the astigmatism curve map of this optical lens.Therefore, this optical lens has good optical property, as shown in Figure 13 to Figure 16 of accompanying drawing.
Following table 7 is the parameter of the system of the described optical lens of embodiment 4:
| Face sequence number | Radius-of-curvature r | Center thickness d | Refractive index Nd | Abbe constant Vd |
| 1 | -19.457 | 1.004 | 1.75 | 52.3 |
| 2 | 4.280 | 2.713 | ||
| 3 | 6.313 | 2.801 | 1.80 | 46.57 |
| 4 | -21.612 | 2.281 | ||
| STO | Infinity | 0.514 | ||
| 6 | -4.577 | 0.603 | 1.84 | 42.7 |
| 7 | 4.088 | 2.176 | 1.75 | 52.3 |
| 8 | -3.143 | 0.100 | ||
| 9 | 5.278 | 2.814 | 1.51 | 56.82 |
| 10 | 6.332 | 1.000 | ||
| 11 | Infinity | 0.701 | 1.52 | 64.17 |
| 12 | Infinity | 2.358 | ||
| IMA | Infinity |
That following table 8 is listed is asphericity coefficient K, A, B, C, D, E:
| Face sequence number | K | A | B | C | D | E |
| 6 | 1.894298 | -6.07712E-03 | 2.52228E-03 | -1.25428E-03 | 4.39495E-04 | -6.63308E-05 |
| 7 | -7.61499 | 3.19178E-02 | -1.13368E-02 | 1.49418E-03 | 1.18261E-04 | -3.21623E-05 |
| 8 | -0.11792 | 3.33277E-03 | -4.44728E-04 | 6.98934E-05 | 4.45825E-06 | -2.57041E-07 |
| 9 | 0.517756 | -7.46451E-04 | 2.59083E-04 | 1.69566E-06 | -6.36868E-06 | 1.22806E-07 |
| 10 | 4.531809 | -9.35661E-03 | 3.86409E-04 | -3.18205E-05 | 3.95945E-06 | -2.08549E-06 |
At least one surface in two surfaces of the 5th lens L5 is aspheric surface, to improve solution picture and the imaging performance of optical lens entirety, preferably, described first lens L1, the second lens L2 are spherical glass eyeglass, described 3rd lens L3, the 4th lens L4 and the 5th lens L5 are plastic aspherical element eyeglass, as shown in table 7 and table 8.
Thus make the optical lens according to the present invention the 4th preferred embodiment be suitable for being miniaturized and having better imaging performance.
As shown in table 7 and table 8, in the 4th preferred embodiment, as one group of concrete example parameter, adopt the optical lens of this parameter, better optical property can be reached.
In sum, the optical lens according to the present invention the 4th preferred embodiment under the prerequisite of high pixel, little distortion, high resolution imaging, can realize the miniaturization of whole optical lens, is suitable for being used in automotive field to make it.In addition, according to the optimum configurations of each lens of the optical lens of the present invention the 4th preferred embodiment, it can be made to be set up and to adopt the insensitive material of temperature variation, as glass material is made, stablize to make its retention in the environment that temperature variation is larger.In other words, the optical lens of the present invention the 4th preferred embodiment can be set up the lens combination with minimum five lens composition, to realize high pixel, little distortion, high resolution imaging, and this optical lens can be set up miniaturization and can be stable into picture in large-temperature range.
Therefore, optical lens according to the present invention the 4th preferred embodiment can be set up the design of employing 5 lens structures and aspherical lens, can under the requirement condition meeting low cost, miniaturization, realize high pixel, little, the large aperture of distorting, high pass optical property and meet high definition and require and effectively correct the various aberrations of optical system, can ensure still to keep more perfect imaging definition in the temperature range of-40 DEG C ~+85 DEG C, be specially adapted to take into account day and night or monitoring that lighting condition is poor and in-vehicle camera system.
Shown in Figure 17 to Figure 20 of reference accompanying drawing of the present invention, optical lens according to the present invention the 5th preferred embodiment is illustrated, wherein this optical lens comprises at least one first lens L1, at least one second lens L2, the 3rd lens L3, the 4th lens L4 and a 5th lens L5, wherein these first lens L1 has negative power, these second lens L2 has positive light coke, 3rd lens L3 and the 4th lens L4 forms an achromat group, 5th lens L5 is for having positive light coke, and the 5th lens L5 has at least one aspheric surface.In other words, the 5th lens L5 is aspheric mirror.Preferably, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are aspheric mirror, to improve the optical property of the optical lens according to the present invention the 5th preferred embodiment.Alternatively, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are spherical mirror.
As shown in Figure 17 of accompanying drawing, these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 form a front lens group and a rear lens group, wherein this front lens group at least comprises the first lens L1, this rear lens group at least comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5, and wherein this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.In other words, this front lens group can be formed by these first lens L1, also can be formed by these first lens L1 and these second lens L2, wherein when this front lens group is formed by these first lens L1, this rear lens group comprises these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5; When this front lens group is formed by these first lens L1 and these second lens L2, this rear lens group comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5.As shown in Figure 17 of accompanying drawing, this front lens group can be formed by these first lens L1, and this rear lens group is formed by these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5.Preferably, this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.More preferably, these second lens L2 of these first lens L1 of this front lens group and this rear lens group, this achromat group and the 5th lens L5 are sequentially set along direction from the object side to the image side.
As shown in Figure 17 of accompanying drawing, the photocentre according to these first lens L1 of the optical lens of the present invention the 5th preferred embodiment, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.
As shown in Figure 17 of accompanying drawing, optical lens according to the present invention the 5th preferred embodiment comprises a diaphragm L6 further, wherein front lens group and rear lens group can be set up and lay respectively at this diaphragm L6 both sides, and wherein the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.Preferably, this diaphragm L6 is arranged between this first lens L1 and these second lens L2, as shown in Figure 17 of accompanying drawing.Alternatively, this diaphragm L6 is arranged between this second lens L2 and the 3rd lens L3.
Alternatively, this diaphragm L6 is arranged on this rear lens group, and the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.In certain embodiments, this diaphragm L6 also can be arranged between this achromat group and the 5th lens L5.Further, this diaphragm L6 also can be arranged on this achromat group, as being arranged on the 3rd lens L3 or the 4th lens L4.In further embodiments, this diaphragm L6 is arranged between this front lens group and this rear lens group.
Be understandable that, the concave-concave shape of these first lens L1 makes the optical lens of the present invention the 5th preferred embodiment have a larger aperture, is beneficial to the front end optic diameter reducing this optical lens, thus meets small form factor requirements and reduce costs.Especially, when this diaphragm L6 is arranged on this first lens L1 and these second lens L2, the concave-concave shape of these first lens L1 allows the imaging within the scope of greater angle to enter this first lens L1 and by this diaphragm L6.Meanwhile, these second lens L2 has positive light coke, thus is beneficial to the light (refer to and penetrate from these first lens L1 the light come) converging front and disperse, to be conducive to the rectification of aberration.
Further, the focal length of these first lens L1 is F1, and the focal length according to the optical lens of the present invention the 5th preferred embodiment is F, then-0.5 >=F1/F >=-2, as shown in table 1A and table 2A.
As shown in Figure 17 of accompanying drawing, these first lens L1 according to the optical lens of the present invention the 5th preferred embodiment has two concave surfaces S1, S2, these second lens L2 has two convex surfaces S4, S5, wherein two concave surfaces S1, S2 of these first lens L1 are respectively towards object space and image space, and two convex surfaces S4, S5 of these second lens L2 are respectively towards object space and image space.As shown in Figure 17 of accompanying drawing, these first lens L1 is configured to make its concave surface S1 towards object space, and this concave surface S2 is towards image space, and these second lens L2 is configured to make its convex surface S4 towards object space, and this convex surface S5 is towards image space.
As shown in Figure 17 of accompanying drawing, further, the 3rd lens L3 according to the optical lens of the present invention the 5th preferred embodiment has two convex surfaces S6, S7,4th lens L4 has an a concave surface S7 ' and convex surface S8, wherein two convex surfaces S6, S7 of the 3rd lens L3 are respectively towards object space and image space, this concave surface S7 ' of the 4th lens L4 is towards object space, this convex surface S8 of the 4th lens L4 is towards image space, and wherein the 3rd lens L3 is set up towards the convex surface S7 of image space and the 4th lens L4 towards the concave surface S7 ' of object space opposite of practising physiognomy.In other words, two-sided lens is according to these first lens L1 of the optical lens of the present invention the 5th preferred embodiment, these second lens L2, the 3rd lens L3 and the 4th lens L4.As shown in Figure 17 of accompanying drawing, the 3rd lens L3 is configured to make its convex surface S6 towards object space, and this convex surface S7 is towards image space, and the 4th lens L4 is configured to make its concave surface S7 ' towards object space, and this convex surface S8 is towards image space.Therefore, these first lens L1 is a biconcave lens, and these second lens L2 is a biconvex lens, and the 3rd lens L3 is a biconvex lens, and the 4th lens L4 is falcate.As shown in Figure 17 of accompanying drawing, the 5th lens L5 according to the optical lens of the present invention the 5th preferred embodiment has two surperficial S9, S10, wherein two surperficial S9, S10 of the 5th lens L5 are respectively towards object space and image space, and at least one in two surperficial S9, S10 of wherein the 5th lens L5 is aspheric surface.In other words, the 5th lens L5 is two-sided lens, and has at least one aspheric surface.Preferably, a surperficial S9 of the 5th lens L5 is towards object space, and another surperficial S10 is towards image space.More preferably, two surperficial S9, S10 of the 5th lens L5 are convex surface.Alternatively, one in two surperficial S9, S10 of the 5th lens L5 is convex surface, and another is plane.
As shown in Figure 17 of accompanying drawing, this achromat group according to the optical lens of the present invention the 5th preferred embodiment is preferably balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Now, because the 3rd lens L3 and the 4th lens L4 is glued together, therefore, together with the convex surface S7 of the 3rd lens L3 coincides with the concave surface S7 ' of the 4th lens L4.Now, the convex surface S7 of the 3rd lens L3 and the concave surface S7 ' of the 4th lens L4 is set up opposite of practising physiognomy.Alternatively, this achromat group also can be two divergence type achromat groups.Be understandable that, when this achromat group is two divergence type achromat group, the 3rd lens L3 and the 4th lens L4 is set up separately, then this diaphragm L6 can be arranged between the 3rd lens L3 and the 4th lens L4.
It should be noted that these first lens L1 can be made up of glass material, the material that also can have good light permeability energy by other is made.It will be appreciated by those skilled in the art that, when the refractive index of these first lens L1 is too high, then imaging is by after these first lens L1, can be dispersed excessive, so that subsequent lens, as the second lens L2 have to be configured to have a high index of refraction, heavy caliber and/or comparatively heavy thickness to converge light.Therefore, according to the refractive index Nd (1)≤1.85 of these first lens L1 of the optical lens of the present invention the 5th preferred embodiment, to avoid imaging too to disperse, as shown in table 1A and table 2A.In other words, the refractive index making the material of these first lens L1 is not more than 1.85.In addition, in order to avoid imaging is excessive by the aberration after these first lens L1, the Abbe constant Vd (1) >=40 of the material of these first lens L1 is limited, as shown in table 1A and table 2A.In order to converge by the imaging of these first lens L1 and dispersing further of suppression imaging, to make to be transferred to this rear lens group reposefully by the imaging of these first lens L1, then these second lens L2 is set up and has higher refractive index, therefore, the refractive index of these second lens L2 is Nd (2), then Nd (2) >=1.55, preferably, Nd (2) >=1.7, as shown in table 1A and table 2A.In other words, the refractive index making the material of these second lens L2 is not less than 1.55.In addition, these second lens L2 is set up has Abbe constant Vd (2), then 20≤Vd (2)≤65, effectively to correct the axial chromatic aberation of imaging, as shown in table 1A and table 2A.
Simultaneously, due to the refractive index Nd (1)≤1.85 of these first lens L1, Abbe constant Vd (1) >=40, the refractive index Nd (2) >=1.55 of these second lens L2, preferably, Nd (2) >=1.7, Abbe constant 20≤Vd (2)≤65, therefore these first lens L1 and these second lens L2 all can be made up of more cheap glass material.
Therefore, be set up according to the front lens group of the optical lens of the present invention the 5th preferred embodiment and rear lens group, thus the ratio of the total length TTL of this optical lens and the focal length F of this optical lens can be met: TTL/F≤7.5, wherein the total length TTL of this optical lens refer to from the first lens L1 towards the concave surface of object space to the distance of imaging surface.
As shown in following table 1A and table 2A, optical lens according to the present invention the 5th preferred embodiment can be set to the radius-of-curvature of the concave surface S1 towards object space of these first lens L1 for-7.693 (from object spaces to image space), the radius-of-curvature of the concave surface S2 towards image space of these first lens L1 is 4.290 (from object spaces to image space), the refractive index of these first lens L1 is 1.68, and the Abbe constant of these first lens L1 is 54.9; The radius-of-curvature of the convex surface S4 towards object space of these second lens L2 is 9.074 (from object spaces to image space), the radius-of-curvature of the convex surface S5 towards image space of these second lens L2 is-9.148 (from object spaces to image space), the refractive index of these second lens L2 is 1.77, the Abbe constant of these second lens L2 is 49.6, MTF then according to the optical lens of the present invention the 5th preferred embodiment separates image curve as shown in figure 18, as shown in figure 19, the distortion curve figure of this optical lens as shown in figure 20 for the astigmatism curve map of this optical lens.Therefore, this optical lens has good optical property, as shown in Figure 18 to Figure 20 of accompanying drawing.
Table 1A: the parameter of each lens of optical lens
| Face sequence number | Radius of curvature R | Center thickness D | Refractive index Nd | Abbe constant Vd |
| S1 | -7.693 | 0.800 | 1.68 | 54.9 |
| S2 | 4.290 | 2.752 | ||
| STO | Infinity | 0.000 | ||
| S4 | 9.074 | 4.000 | 1.77 | 49.6 |
| S5 | -9.148 | 0.300 | ||
| S6 | 11.160 | 4.000 | 1.5 | 81.6 |
| S7 | -6.766 | 0.800 | ||
| S7′ | -6.766 | 0.800 | 1.78 | 25.7 |
| S8 | -28.694 | 0.180 | ||
| S9 | 7.092 | 2.200 | 1.51 | 63.8 |
| S10 | -20.000 | 0.500 | ||
| S11 | Infinity | 0.950 | 1.52 | 64.2 |
| S12 | Infinity | 4.860 | ||
| IMA | Infinity |
Table 2A: the parameter of each lens of optical lens
| Nd(1) | Vd(1) | Nd(2) | Vd(2) | F1 | F | TTL | F1/F | TTL/F |
| 1.68 | 54.9 | 1.77 | 49.6 | -3.94 | 3.79 | 21.34 | -1.04 | 5.63 |
Alternatively, the 5th lens L5 has at least one aspheric surface, and this aspheric surface meets following formula:
Wherein, Z (h) for aspheric surface along optical axis direction when being highly the position of h, apart from the distance rise on this aspheric surface summit, c=1/r, r represents the radius-of-curvature of aspherical mirror, k is circular cone coefficient conic, and A, B, C, D, E are high order aspheric surface coefficient, and wherein the parameters that relates to of above-mentioned formula is as following table 3A:
Table 3A
| Surf | K | A | B | C | D | E |
| 9 | 1.772565 | -7.84760E-04 | 2.03208E-04 | -4.79963E-05 | 7.10422E-06 | -4.01297E-07 |
| 10 | -5.511378 | 7.11871E-04 | 3.82934E-04 | -1.03112E-04 | 1.32688E-05 | -7.36120E-07 |
In other words, at least one convex surface in two convex surfaces of the 5th lens L5 is aspheric surface, to improve solution picture and the imaging performance of this optical lens, thus the optical lens according to the present invention the 5th preferred embodiment is made to be suitable for being miniaturized and having better imaging performance.
In sum, the optical lens according to the present invention the 5th preferred embodiment under the prerequisite of high pixel, little distortion, high resolution imaging, can realize the miniaturization of whole optical lens, is suitable for being used in automotive field to make it.In addition, according to the optimum configurations of each lens of the optical lens of the present invention the 5th preferred embodiment, it can be made to be set up and to adopt the insensitive material of temperature variation, as glass material is made, stablize to make its retention in the environment that temperature variation is larger.In other words, the optical lens of the present invention the 5th preferred embodiment can be set up the lens combination with minimum five lens composition, to realize high pixel, little distortion, high resolution imaging, and this optical lens can be set up miniaturization and can be stable into picture in large-temperature range.
Shown in Figure 21 to Figure 24 of reference accompanying drawing of the present invention, optical lens according to the present invention the 6th preferred embodiment is illustrated, wherein this optical lens comprises at least one first lens L1, at least one second lens L2, the 3rd lens L3, the 4th lens L4 and a 5th lens L5, wherein these first lens L1 has negative power, these second lens L2 has positive light coke, 3rd lens L3 and the 4th lens L4 forms an achromat group, 5th lens L5 is for having positive light coke, and the 5th lens L5 has at least one aspheric surface.In other words, the 5th lens L5 is aspheric mirror.Preferably, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are aspheric mirror, to improve the optical property of the optical lens according to the present invention the 6th preferred embodiment.Alternatively, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are spherical mirror.
As shown in Figure 21 of accompanying drawing, these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 form a front lens group and a rear lens group, wherein this front lens group at least comprises the first lens L1, this rear lens group at least comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5, and wherein this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.In other words, this front lens group can be formed by these first lens L1, also can be formed by these first lens L1 and these second lens L2, wherein when this front lens group is formed by these first lens L1, this rear lens group comprises these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5; When this front lens group is formed by these first lens L1 and these second lens L2, this rear lens group comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5.
As shown in Figure 21 of accompanying drawing, this front lens group can be formed by these first lens L1, and this rear lens group is formed by these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5.Preferably, this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.More preferably, these second lens L2 of these first lens L1 of this front lens group and this rear lens group, this achromat group and the 5th lens L5 are sequentially set along direction from the object side to the image side.As shown in Figure 21 of accompanying drawing, the photocentre according to these first lens L1 of the optical lens of the present invention the 6th preferred embodiment, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.
As shown in Figure 21 of accompanying drawing, optical lens according to the present invention the 6th preferred embodiment comprises a diaphragm L6 further, wherein front lens group and rear lens group can be set up and lay respectively at this diaphragm L6 both sides, and wherein the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.Preferably, this diaphragm L6 is arranged between this first lens L1 and these second lens L2, as shown in Figure 17 of accompanying drawing.Alternatively, this diaphragm L6 is arranged between this second lens L2 and the 3rd lens L3.
Be understandable that, the concave-concave shape of these first lens L1 makes the optical lens of the present invention the 6th preferred embodiment have a larger aperture, is beneficial to the front end optic diameter reducing this optical lens, thus meets small form factor requirements and reduce costs.Especially, when this diaphragm L6 is arranged between this first lens L1 and these second lens L2, the concave-concave shape of these first lens L1 allows the imaging within the scope of greater angle to enter this first lens L1 and by this diaphragm L6.Meanwhile, these second lens L2 has positive light coke, thus is beneficial to the light (refer to and penetrate from these first lens L1 the light come) converging front and disperse, to be conducive to the rectification of aberration.
Further, the focal length of these first lens L1 is F1, and the focal length according to the optical lens of the present invention the 6th preferred embodiment is F, then-0.5 >=F1/F >=-2, as shown in Figure 20 and Figure 21.
As shown in Figure 21 of accompanying drawing, these first lens L1 according to the optical lens of the present invention the 6th preferred embodiment has two concave surfaces S1, S2, these second lens L2 has two convex surfaces S4, S5, wherein two concave surfaces S1, S2 of these first lens L1 are respectively towards object space and image space, and two convex surfaces S4, S5 of these second lens L2 are respectively towards object space and image space.As shown in Figure 21 of accompanying drawing, these first lens L1 is configured to make its concave surface S1 towards object space, and this concave surface S2 is towards image space, and these second lens L2 is configured to make its convex surface S4 towards object space, and this convex surface S5 is towards image space.
As shown in Figure 21 of accompanying drawing, further, the 3rd lens L3 according to the optical lens of the present invention the 6th preferred embodiment has two convex surface S6, S7, 4th lens L4 has an a concave surface S7 ' and convex surface S8, 5th lens L5 has a convex surface S9, wherein two convex surface S6 of the 3rd lens L3, S7 is respectively towards object space and image space, this concave surface S7 ' of the 4th lens L4 is towards object space, this convex surface S8 of the 4th lens L4 is towards image space, wherein the 3rd lens L3 is set up towards the convex surface S7 of image space and the 4th lens L4 towards the concave surface S7 ' of object space opposite of practising physiognomy.In other words, two-sided lens is according to these first lens L1 of the optical lens of the present invention the 6th preferred embodiment, these second lens L2, the 3rd lens L3 and the 4th lens L4.As shown in Figure 21 of accompanying drawing, the 3rd lens L3 is configured to make its convex surface S6 towards object space, and this convex surface S7 is towards image space, and the 4th lens L4 is configured to make its concave surface S7 ' towards object space, and this convex surface S8 is towards image space.Therefore, these first lens L1 is a biconcave lens, and these second lens L2 is a biconvex lens, and the 3rd lens L3 is a biconvex lens, and the 4th lens L4 is falcate.As shown in Figure 21 of accompanying drawing, the 5th lens L5 according to the optical lens of the present invention the 6th preferred embodiment has two surperficial S9, S10, wherein two surperficial S9, S10 of the 5th lens L5 are respectively towards object space and image space, and at least one in two surperficial S9, S10 of wherein the 5th lens L5 is aspheric surface.In other words, the 5th lens L5 is two-sided lens, and has at least one aspheric surface.Preferably, a surperficial S9 of the 5th lens L5 is towards object space, and another surperficial S10 is towards image space.More preferably, two surperficial S9, S10 of the 5th lens L5 are convex surface.Alternatively, one in two surperficial S9, S10 of the 5th lens L5 is convex surface, and another is plane.
As shown in Figure 21 of accompanying drawing, this achromat group according to the optical lens of the present invention the 6th preferred embodiment is preferably balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Now, because the 3rd lens L3 and the 4th lens L4 is glued together, therefore, together with the convex surface S7 of the 3rd lens L3 coincides with the concave surface S7 ' of the 4th lens L4.Now, the convex surface S7 of the 3rd lens L3 and the concave surface S7 ' of the 4th lens L4 is set up opposite of practising physiognomy.Alternatively, this achromat group also can be two divergence type achromat groups.Be understandable that, when this achromat group is two divergence type achromat group, the 3rd lens L3 and the 4th lens L4 is set up separately, then this diaphragm L6 can be arranged between the 3rd lens L3 and the 4th lens L4.
As shown in Figure 21 of accompanying drawing, this achromat group according to the optical lens of the present invention the 6th preferred embodiment is balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Alternatively, this achromat group also can be two divergence type achromat groups.
It should be noted that these first lens L1 can be made up of glass material, the material that also can have good light permeability energy by other is made.It will be appreciated by those skilled in the art that, when the refractive index of these first lens L1 is too high, then imaging is by after these first lens L1, can be dispersed excessive, so that subsequent lens, as the second lens L2 have to be configured to have a high index of refraction, heavy caliber and/or comparatively heavy thickness to converge light.Therefore, according to the refractive index Nd (1)≤1.85 of these first lens L1 of the optical lens of the present invention the 6th preferred embodiment, to avoid imaging too to disperse, as shown in Figure 20 and Figure 21.In other words, the refractive index making the material of these first lens L1 is not more than 1.85.In addition, in order to avoid imaging is excessive by the aberration after these first lens L1, the Abbe constant Vd (1) >=40 of the material of these first lens L1 is limited, as shown in Figure 20 and Figure 21.In order to converge by the imaging of these first lens L1 and dispersing further of suppression imaging, to make to be transferred to this rear lens group reposefully by the imaging of these first lens L1, then these second lens L2 is set up and has higher refractive index, therefore, the refractive index of these second lens L2 is Nd (2), then Nd (2) >=1.55, preferably, Nd (2) >=1.7, as shown in Figure 20 and Figure 21.In other words, the refractive index making the material of these second lens L2 is not less than 1.55.In addition, these second lens L2 is set up has Abbe constant Vd (2), then 20≤Vd (2)≤65, effectively to correct the axial chromatic aberation of imaging, as shown in Figure 20 and Figure 21.
Simultaneously, due to the refractive index Nd (1)≤1.85 of these first lens L1, Abbe constant Vd (1) >=40, the refractive index Nd (2) >=1.55 of these second lens L2, preferably, Nd (2) >=1.7, Abbe constant 20≤Vd (2)≤65, therefore these first lens L1 and these second lens L2 all can be made up of more cheap glass material.
Therefore, be set up according to the front lens group of the optical lens of the present invention the 6th preferred embodiment and rear lens group, thus the ratio of the total length TTL of this optical lens and the focal length F of this optical lens can be met: TTL/F≤7.5, wherein the total length TTL of this optical lens refer to from the first lens L1 towards the concave surface of object space to the distance of imaging surface.
Shown in following Figure 20 and Figure 21, optical lens according to the present invention the 6th preferred embodiment can be set to the radius-of-curvature of the concave surface S1 towards object space of these first lens L1 for-15.021 (from object spaces to image space), the radius-of-curvature of the concave surface S2 towards image space of these first lens L1 is 3.590 (from object spaces to image space), the refractive index of these first lens L1 is 1.77, and the Abbe constant of these first lens L1 is 49.6; The radius-of-curvature of the convex surface S4 towards object space of these second lens L2 is 11.646 (from object spaces to image space), the radius-of-curvature of the convex surface S5 towards image space of these second lens L2 is-7.686 (from object spaces to image space), the refractive index of these second lens L2 is 1.75, the Abbe constant of these second lens L2 is 52.3, MTF then according to the optical lens of the present invention the 6th preferred embodiment separates image curve as shown in figure 22, as shown in figure 23, the distortion curve figure of this optical lens as shown in figure 24 for the astigmatism curve map of this optical lens.Therefore, this optical lens has good optical property, as shown in Figure 22 to Figure 24 of accompanying drawing.
Table 4A: the parameter of each lens of optical lens
| Face sequence number | Radius of curvature R | Center thickness D | Refractive index Nd | Abbe constant Vd |
| S1 | -15.021 | 0.800 | 1.77 | 49.6 |
| S2 | 3.590 | 3.062 | ||
| STO | Infinity | 0.000 | ||
| S4 | 11.646 | 4.800 | 1.75 | 52.3 |
| S5 | -7.686 | 0.300 | ||
| S6 | 10.744 | 4.600 | 1.59 | 61.6 |
| S7 | -4.697 | 0.650 | ||
| S7′ | -4.697 | 0.650 | 1.78 | 25.7 |
| S8 | -54.135 | 0.180 | ||
| S9 | 6.880 | 2.200 | 1.51 | 63.8 |
| S10 | -16.627 | 0.500 | ||
| S11 | Infinity | 0.950 | 1.52 | 64.2 |
| S12 | Infinity | 4.620 | ||
| IMA | Infinity |
Table 5A: the parameter of each lens of optical lens
| Nd(1) | Vd(1) | Nd(2) | Vd(2) | F1 | F | TTL | F1/F | TTL/F |
| 1.77 | 49.6 | 1.75 | 52.3 | -3.66 | 3.25 | 22.66 | -1.13 | 6.96 |
Alternatively, the 5th lens L5 has at least one aspheric surface, and this aspheric surface meets following formula:
Wherein, Z (h) for aspheric surface along optical axis direction when being highly the position of h, apart from the distance rise on this aspheric surface summit, c=1/r, r represents the radius-of-curvature of aspherical mirror, k is circular cone coefficient conic, and A, B, C, D, E are high order aspheric surface coefficient, and wherein the parameters that relates to of above-mentioned formula is as following table 6A:
Table 6A
| Surf | K | A | B | C | D | E |
| 9 | 2.13737 | -6.14534E-04 | 2.77319E-04 | -6.04441E-05 | 5.28979E-06 | -3.07681E-07 |
| 10 | -145.2098 | 5.80617E-03 | 4.65256E-04 | -9.58216E-05 | 1.27880E-05 | -5.53983E-07 |
In other words, at least one convex surface in two convex surfaces of the 5th lens L5 is aspheric surface, to improve solution picture and the imaging performance of optical lens, thus makes the optical lens according to the present invention the 6th preferred embodiment be suitable for being miniaturized and having better imaging performance.
In sum, the optical lens according to the present invention the 6th preferred embodiment under the prerequisite of high pixel, little distortion, high resolution imaging, can realize the miniaturization of whole optical lens, is suitable for being used in automotive field to make it.In addition, according to the optimum configurations of each lens of the optical lens of the present invention the 6th preferred embodiment, it can be made to be set up and to adopt the insensitive material of temperature variation, as glass material is made, stablize to make its retention in the environment that temperature variation is larger.In other words, the optical lens of the present invention the 6th preferred embodiment can be set up the lens combination with minimum five lens composition, to realize high pixel, little distortion, high resolution imaging, and this optical lens can be set up miniaturization and can be stable into picture in large-temperature range.
Shown in Figure 25 to Figure 28 of reference accompanying drawing of the present invention, optical lens according to the present invention the 7th preferred embodiment is illustrated, wherein this optical lens comprises at least one first lens L1, at least one second lens L2, the 3rd lens L3, the 4th lens L4 and a 5th lens L5, wherein these first lens L1 has negative power, these second lens L2 has positive light coke, 3rd lens L3 and the 4th lens L4 forms an achromat group, 5th lens L5 is for having positive light coke, and the 5th lens L5 has at least one aspheric surface.In other words, the 5th lens L5 is aspheric mirror.Preferably, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are aspheric mirror, to improve the optical property of the optical lens according to the present invention the 7th preferred embodiment.Alternatively, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are spherical mirror.
As shown in Figure 25 of accompanying drawing, these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 form a front lens group and a rear lens group, wherein this front lens group at least comprises the first lens L1, this rear lens group at least comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5, and wherein this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.In other words, this front lens group can be formed by these first lens L1, also can be formed by these first lens L1 and these second lens L2, wherein when this front lens group is formed by these first lens L1, this rear lens group comprises these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5; When this front lens group is formed by these first lens L1 and these second lens L2, this rear lens group comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5.
As shown in Figure 25 of accompanying drawing, this front lens group can be formed by these first lens L1, and this rear lens group is formed by these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5.Preferably, this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.More preferably, these second lens L2 of these first lens L1 of this front lens group and this rear lens group, this achromat group and the 5th lens L5 are sequentially set along direction from the object side to the image side.
As shown in Figure 25 of accompanying drawing, the photocentre according to these first lens L1 of the optical lens of the present invention the 7th preferred embodiment, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.
As shown in Figure 25 of accompanying drawing, optical lens according to the present invention the 7th preferred embodiment comprises a diaphragm L6 further, wherein front lens group and rear lens group can be set up and lay respectively at this diaphragm L6 both sides, and wherein the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.Preferably, this diaphragm L6 is arranged between this first lens L1 and these second lens L2, as shown in Figure 25 of accompanying drawing.Alternatively, this diaphragm L6 is arranged between this second lens L2 and the 3rd lens L3.
Alternatively, this diaphragm L6 is arranged on this rear lens group, and the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.In certain embodiments, this diaphragm L6 also can be arranged between this achromat group and the 5th lens L5.Further, this diaphragm L6 also can be arranged on this achromat group, as being arranged on the 3rd lens L3 or the 4th lens L4.In further embodiments, this diaphragm L6 is arranged between this front lens group and this rear lens group.Be understandable that, the concave-concave shape of these first lens L1 makes the optical lens of the present invention the 7th preferred embodiment have a larger aperture, is beneficial to the front end optic diameter reducing this optical lens, thus meets small form factor requirements and reduce costs.Especially, when this diaphragm L6 is arranged between this first lens L1 and these second lens L2, the concave-concave shape of these first lens L1 allows the imaging within the scope of greater angle to enter this first lens L1 and by this diaphragm L6.Meanwhile, these second lens L2 has positive light coke, thus is beneficial to the light (refer to and penetrate from these first lens L1 the light come) converging front and disperse, to be conducive to the rectification of aberration.
Further, the focal length of these first lens L1 is F1, and the focal length according to the optical lens of the present invention the 7th preferred embodiment is F, then-0.5 >=F1/F >=-2, as shown in table 7A and table 8A.
As shown in Figure 25 of accompanying drawing, these first lens L1 according to the optical lens of the present invention the 7th preferred embodiment has two concave surfaces S1, S2, these second lens L2 has two convex surfaces S4, S5, wherein two concave surfaces S1, S2 of these first lens L1 are respectively towards object space and image space, and two convex surfaces S4, S5 of these second lens L2 are respectively towards object space and image space.As shown in Figure 25 of accompanying drawing, these first lens L1 is configured to make its concave surface S1 towards object space, and this concave surface S2 is towards image space, and these second lens L2 is configured to make its convex surface S4 towards object space, and this convex surface S5 is towards image space.
As shown in Figure 25 of accompanying drawing, further, the 3rd lens L3 according to the optical lens of the present invention the 7th preferred embodiment has two convex surfaces S6, S7,4th lens L4 has an a concave surface S7 ' and convex surface S8, wherein two convex surfaces S6, S7 of the 3rd lens L3 are respectively towards object space and image space, this concave surface S7 ' of the 4th lens L4 is towards object space, this convex surface S8 of the 4th lens L4 is towards image space, and wherein the 3rd lens L3 is set up towards the convex surface S7 of image space and the 4th lens L4 towards the concave surface S7 ' of object space opposite of practising physiognomy.In other words, two-sided lens is according to these first lens L1 of the optical lens of the present invention the 7th preferred embodiment, these second lens L2, the 3rd lens L3 and the 4th lens L4.As shown in Figure 25 of accompanying drawing, the 3rd lens L3 is configured to make its convex surface S6 towards object space, and this convex surface S7 is towards image space, and the 4th lens L4 is configured to make its concave surface S7 ' towards object space, and this convex surface S8 is towards image space.Therefore, these first lens L1 is a biconcave lens, and these second lens L2 is a biconvex lens, and the 3rd lens L3 is a biconvex lens, and the 4th lens L4 is falcate.As shown in Figure 25 of accompanying drawing, the 5th lens L5 according to the optical lens of the present invention the 7th preferred embodiment has two surperficial S9, S10, wherein two surperficial S9, S10 of the 5th lens L5 are respectively towards object space and image space, and at least one in two surperficial S9, S10 of wherein the 5th lens L5 is aspheric surface.In other words, the 5th lens L5 is two-sided lens, and has at least one aspheric surface.Preferably, a surperficial S9 of the 5th lens L5 is towards object space, and another surperficial S10 is towards image space.More preferably, two surperficial S9, S10 of the 5th lens L5 are convex surface.Alternatively, one in two surperficial S9, S10 of the 5th lens L5 is convex surface, and another is plane.
As shown in Figure 25 of accompanying drawing, this achromat group according to the optical lens of the present invention the 7th preferred embodiment is preferably balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Now, because the 3rd lens L3 and the 4th lens L4 is glued together, therefore, together with the convex surface S7 of the 3rd lens L3 coincides with the concave surface S7 ' of the 4th lens L4.Now, the convex surface S7 of the 3rd lens L3 and the concave surface S7 ' of the 4th lens L4 is set up opposite of practising physiognomy.Alternatively, this achromat group also can be two divergence type achromat groups.Be understandable that, when this achromat group is two divergence type achromat group, the 3rd lens L3 and the 4th lens L4 is set up separately, then this diaphragm L6 can be arranged between the 3rd lens L3 and the 4th lens L4.
As shown in Figure 25 of accompanying drawing, this achromat group according to the optical lens of the present invention the 7th preferred embodiment is balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Alternatively, this achromat group also can be two divergence type achromat groups.
It should be noted that these first lens L1 can be made up of glass material, the material that also can have good light permeability energy by other is made.It will be appreciated by those skilled in the art that, when the refractive index of these first lens L1 is too high, then imaging is by after these first lens L1, can be dispersed excessive, so that subsequent lens, as the second lens L2 have to be configured to have a high index of refraction, heavy caliber and/or comparatively heavy thickness to converge light.Therefore, according to the refractive index Nd (1)≤1.85 of these first lens L1 of the optical lens of the present invention the 7th preferred embodiment, to avoid imaging too to disperse, as shown in table 7A and table 8A.In other words, the refractive index making the material of these first lens L1 is not more than 1.85.In addition, in order to avoid imaging is excessive by the aberration after these first lens L1, the Abbe constant Vd (1) >=40 of the material of these first lens L1 is limited, as shown in table 7A and table 8A.In order to converge by the imaging of these first lens L1 and dispersing further of suppression imaging, to make to be transferred to this rear lens group reposefully by the imaging of these first lens L1, then these second lens L2 is set up and has higher refractive index, therefore, the refractive index of these second lens L2 is Nd (2), then Nd (2) >=1.55, preferably, Nd (2) >=1.7, as shown in table 7A and table 8A.In other words, the refractive index making the material of these second lens L2 is not less than 1.55.In addition, these second lens L2 is set up has Abbe constant Vd (2), then 20≤Vd (2)≤65, effectively to correct the axial chromatic aberation of imaging, as shown in table 7A and table 8A.
Simultaneously, due to the refractive index Nd (1)≤1.85 of these first lens L1, Abbe constant Vd (1) >=40, the refractive index Nd (2) >=1.55 of these second lens L2, preferably, Nd (2) >=1.7, Abbe constant 20≤Vd (2)≤65, therefore these first lens L1 and these second lens L2 all can be made up of more cheap glass material.
Therefore, be set up according to the front lens group of the optical lens of the present invention the 7th preferred embodiment and rear lens group, thus the ratio of the total length TTL of this optical lens and the focal length F of this optical lens can be met: TTL/F≤7.5, wherein the total length TTL of this optical lens refer to from the first lens L1 towards the concave surface of object space to the distance of imaging surface.
As shown in following table 7A and table 8A, optical lens according to the present invention the 7th preferred embodiment can be set to the radius-of-curvature of the concave surface S1 towards object space of these first lens L1 for-9.622 (from object spaces to image space), the radius-of-curvature of the concave surface S2 towards image space of these first lens L1 is 3.940 (from object spaces to image space), the refractive index of these first lens L1 is 1.84, and the Abbe constant of these first lens L1 is 42.7; The radius-of-curvature of the convex surface S4 towards object space of these second lens L2 is 10.331 (from object spaces to image space), the radius-of-curvature of the convex surface S5 towards image space of these second lens L2 is-7.412 (from object spaces to image space), the refractive index of these second lens L2 is 1.80, the Abbe constant of these second lens L2 is 46.6, MTF then according to the optical lens of the present invention the 7th preferred embodiment separates image curve as shown in figure 26, as shown in figure 27, the distortion curve figure of this optical lens as shown in figure 28 for the astigmatism curve map of this optical lens.Therefore, this optical lens has good optical property, as shown in Figure 26 to Figure 28 of accompanying drawing.
Table 7A: the parameter of each lens of optical lens
| Face sequence number | Radius of curvature R | Center thickness D | Refractive index Nd | Abbe constant Vd |
| S1 | -9.622 | 0.800 | 1.84 | 42.7 |
| S2 | 3.940 | 2.111 | ||
| STO | Infinity | 0.000 | ||
| S4 | 10.331 | 4.500 | 1.80 | 46.6 |
| S5 | -7.412 | 0.300 | ||
| S6 | 8.198 | 4.800 | 1.50 | 81.6 |
| S7 | -4.430 | 0.650 | ||
| S7′ | -4.430 | 0.650 | 1.78 | 25.7 |
| S8 | -50.970 | 0.180 | ||
| S9 | 6.891 | 2.200 | 1.62 | 60.3 |
| S10 | -17.281 | 0.500 | ||
| S11 | Infinity | 0.950 | 1.52 | 64.2 |
| S12 | Infinity | 4.052 | ||
| IMA | Infinity |
Table 8A: the parameter of each lens of optical lens
| Nd(1) | Vd(1) | Nd(2) | Vd(2) | F1 | F | TTL | F1/F | TTL/F |
| 1.84 | 42.7 | 1.8 | 46.6 | -3.24 | 3.56 | 21.04 | -0.91 | 5.91 |
Alternatively, the 5th lens L5 has at least one aspheric surface, and this aspheric surface meets following formula:
Wherein, Z (h) for aspheric surface along optical axis direction when being highly the position of h, apart from the distance rise on this aspheric surface summit, c=1/r, r represents the radius-of-curvature of aspherical mirror, k is circular cone coefficient conic, and A, B, C, D, E are high order aspheric surface coefficient, and wherein the parameters that relates to of above-mentioned formula is as following table 9A:
Table 9A
| Surf | K | A | B | C | D | E |
| 9 | 2.076894 | -6.25822E-04 | 4.99231E-04 | -1.33350E-04 | 1.61843E-05 | -6.49550E-07 |
| 10 | -100.2098 | 3.44509E-04 | -1.27920E-05 | 1.56858E-05 | -7.10819E-07 | 1.15656E-07 |
In other words, at least one convex surface in two convex surfaces of the 5th lens L5 is aspheric surface, to improve solution picture and the imaging performance of this optical lens, thus the optical lens according to the present invention the 7th preferred embodiment is made to be suitable for being miniaturized and having better imaging performance.
In sum, the optical lens according to the present invention the 7th preferred embodiment under the prerequisite of high pixel, little distortion, high resolution imaging, can realize the miniaturization of whole optical lens, is suitable for being used in automotive field to make it.In addition, according to the optimum configurations of each lens of the optical lens of the present invention the 7th preferred embodiment, it can be made to be set up and to adopt the insensitive material of temperature variation, as glass material is made, stablize to make its retention in the environment that temperature variation is larger.In other words, the optical lens of the present invention the 7th preferred embodiment can be set up the lens combination with minimum five lens composition, to realize high pixel, little distortion, high resolution imaging, and this optical lens can be set up miniaturization and can be stable into picture in large-temperature range.
Shown in Figure 29 to Figure 32 of reference accompanying drawing of the present invention, optical lens according to the present invention the 8th preferred embodiment is illustrated, wherein this optical lens comprises at least one first lens L1, at least one second lens L2, the 3rd lens L3, the 4th lens L4 and a 5th lens L5, wherein these first lens L1 has negative power, these second lens L2 has positive light coke, 3rd lens L3 and the 4th lens L4 forms an achromat group, 5th lens L5 is for having positive light coke, and the 5th lens L5 has at least one aspheric surface.In other words, the 5th lens L5 is aspheric mirror.Preferably, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are aspheric mirror, to improve the optical property of the optical lens according to the present invention the 8th preferred embodiment.Alternatively, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are spherical mirror.
As shown in Figure 29 of accompanying drawing, these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 form a front lens group and a rear lens group, wherein this front lens group at least comprises the first lens L1, this rear lens group at least comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5, and wherein this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.In other words, this front lens group can be formed by these first lens L1, also can be formed by these first lens L1 and these second lens L2, wherein when this front lens group is formed by these first lens L1, this rear lens group comprises these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5; When this front lens group is formed by these first lens L1 and these second lens L2, this rear lens group comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5.
As shown in Figure 29 of accompanying drawing, this front lens group can be formed by these first lens L1, and this rear lens group is formed by these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5.Preferably, this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.More preferably, these second lens L2 of these first lens L1 of this front lens group and this rear lens group, this achromat group and the 5th lens L5 are sequentially set along direction from the object side to the image side.
As shown in Figure 29 of accompanying drawing, the photocentre according to these first lens L1 of the optical lens of the present invention the 8th preferred embodiment, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.
As shown in Figure 29 of accompanying drawing, optical lens according to the present invention the 8th preferred embodiment comprises a diaphragm L6 further, wherein front lens group and rear lens group can be set up and lay respectively at diaphragm both sides, and wherein the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.Preferably, this diaphragm L6 is arranged between this first lens L1 and these second lens L2, as shown in Figure 29 of accompanying drawing.More preferably, this diaphragm L6 is arranged between these second lens L2 and L3.
Alternatively, this diaphragm L6 is arranged on this rear lens group, and the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.In certain embodiments, this diaphragm L6 also can be arranged between this achromat group and the 5th lens L5.Further, this diaphragm L6 also can be arranged on this achromat group, as being arranged between the 3rd lens L3 and the 4th lens L4.In further embodiments, this diaphragm L6 is arranged between this front lens group and this rear lens group.
Be understandable that, the concave-concave shape of these first lens L1 makes the optical lens of the present invention the 8th preferred embodiment have a larger aperture, is beneficial to the front end optic diameter reducing this optical lens, thus meets small form factor requirements and reduce costs.Especially, when this diaphragm L6 is arranged on this first lens L1 and these second lens L2, the concave-concave shape of these first lens L1 allows the imaging within the scope of greater angle to enter this first lens L1 and by this diaphragm L6.Meanwhile, these second lens L2 has positive light coke, thus is beneficial to the light (refer to and penetrate from these first lens L1 the light come) converging front and disperse, to be conducive to the rectification of aberration.
Further, the focal length of these first lens L1 is F1, and the focal length according to the optical lens of the present invention the 8th preferred embodiment is F, then-0.5 >=F1/F >=-2, as shown in table 10A and table 11A.
As shown in Figure 29 of accompanying drawing, these first lens L1 according to the optical lens of the present invention the 8th preferred embodiment has two concave surfaces S1, S2, these second lens L2 has two convex surfaces S4, S5, wherein two concave surfaces S1, S2 of these first lens L1 are respectively towards object space and image space, and two convex surfaces S4, S5 of these second lens L2 are respectively towards object space and image space.As shown in Figure 29 of accompanying drawing, these first lens L1 is configured to make its concave surface S1 towards object space, and this concave surface S2 is towards image space, and these second lens L2 is configured to make its convex surface S4 towards object space, and this convex surface S5 is towards image space.
As shown in Figure 29 of accompanying drawing, further, the 3rd lens L3 according to the optical lens of the present invention the 8th preferred embodiment has an a convex surface S6 and concave surface S7,4th lens L4 has two convex surface S7 ', S8, wherein the convex surface S6 of the 3rd lens L3 is towards object space, the concave surface S7 of the 3rd lens L3 is towards image space, this convex surface S7 ' of the 4th lens L4 is towards object space, this convex surface S8 of the 4th lens L4 is towards image space, and wherein the 3rd lens L3 is set up towards the concave surface S7 of image space and the 4th lens L4 towards the convex surface S7 ' of object space opposite of practising physiognomy.In other words, be two-sided lens according to these first lens L1 of the optical lens of the present invention the 8th preferred embodiment, these second lens L2, the 3rd lens L3 and the 4th lens L4, wherein the 3rd lens L3 is falcate.As shown in Figure 29 of accompanying drawing, the 3rd lens L3 is configured to make its convex surface S6 towards object space, and this convex surface S7 is towards image space, and the 4th lens L4 is configured to make its convex surface S7 ' towards object space, and this convex surface S8 is towards image space.Therefore, these first lens L1 is a biconcave lens, and these second lens L2 is a biconvex lens, and the 3rd lens L3 is a meniscus shaped lens, and the 4th lens L4 has a biconvex lens.As shown in Figure 29 of accompanying drawing, the 5th lens L5 according to the optical lens of the present invention the 5th preferred embodiment has two surperficial S9, S10, wherein two surperficial S9, S10 of the 5th lens L5 are respectively towards object space and image space, and at least one in two surperficial S9, S10 of wherein the 5th lens L5 is aspheric surface.In other words, the 5th lens L5 is two-sided lens, and has at least one aspheric surface.Preferably, a surperficial S9 of the 5th lens L5 is towards object space, and another surperficial S10 is towards image space.More preferably, two surperficial S9, S10 of the 5th lens L5 are convex surface.Alternatively, one in two surperficial S9, S10 of the 5th lens L5 is convex surface, and another is plane.
As shown in Figure 29 of accompanying drawing, this achromat group according to the optical lens of the present invention the 8th preferred embodiment is preferably balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Now, because the 3rd lens L3 and the 4th lens L4 is glued together, therefore, together with the concave surface S7 of the 3rd lens L3 coincides with the convex surface S7 ' of the 4th lens L4.Now, the concave surface S7 of the 3rd lens L3 and the convex surface S7 ' of the 4th lens L4 is set up opposite of practising physiognomy.Alternatively, this achromat group also can be two divergence type achromat groups.Be understandable that, when this achromat group is two divergence type achromat group, the 3rd lens L3 and the 4th lens L4 is set up separately, then this diaphragm L6 can be arranged between the 3rd lens L3 and the 4th lens L4.
As shown in Figure 29 of accompanying drawing, this achromat group according to the optical lens of the present invention the 8th preferred embodiment is balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Alternatively, this achromat group also can be two divergence type achromat groups.
It should be noted that these first lens L1 can be made up of glass material, the material that also can have good light permeability energy by other is made.It will be appreciated by those skilled in the art that, when the refractive index of these first lens L1 is too high, then imaging is by after these first lens L1, can be dispersed excessive, so that subsequent lens, as the second lens L2 have to be configured to have a high index of refraction, heavy caliber and/or comparatively heavy thickness to converge light.Therefore, according to the refractive index Nd (1)≤1.85 of these first lens L1 of the optical lens of the present invention the 8th preferred embodiment, to avoid imaging too to disperse, as shown in table 10A and table 11A.In other words, the refractive index making the material of these first lens L1 is not more than 1.85.In addition, in order to avoid imaging is excessive by the aberration after these first lens L1, the Abbe constant Vd (1) >=40 of the material of these first lens L1 is limited, as shown in table 10A and table 11A.In order to converge by the imaging of these first lens L1 and dispersing further of suppression imaging, to make to be transferred to this rear lens group reposefully by the imaging of these first lens L1, then these second lens L2 is set up and has higher refractive index, therefore, the refractive index of these second lens L2 is Nd (2), then Nd (2) >=1.55, preferably, Nd (2) >=1.7, as shown in table 10A and table 11A.In other words, the refractive index making the material of these second lens L2 is not less than 1.55.In addition, these second lens L2 is set up has Abbe constant Vd (2), then 20≤Vd (2)≤65, effectively to correct the axial chromatic aberation of imaging, as shown in table 10A and table 11A.
Simultaneously, due to the refractive index Nd (1)≤1.85 of these first lens L1, Abbe constant Vd (1) >=40, the refractive index Nd (2) >=1.55 of these second lens L2, Abbe constant 20≤Vd (2)≤65, therefore these first lens L1 and these second lens L2 all can be made up of more cheap glass material.
Therefore, be set up according to the front lens group of the optical lens of the present invention the 8th preferred embodiment and rear lens group, thus the ratio of the total length TTL of this optical lens and the focal length F of this optical lens can be met: TTL/F≤7.5, wherein the total length TTL of this optical lens refer to from the first lens L1 towards the concave surface of object space to the distance of imaging surface.
As shown in following table 10A and table 11A, optical lens according to the present invention the 8th preferred embodiment can be set to the radius-of-curvature of the concave surface S1 towards object space of these first lens L1 for-6.255 (from object spaces to image space), the radius-of-curvature of the concave surface S2 towards image space of these first lens L1 is 4.004 (from object spaces to image space), the refractive index of these first lens L1 is 1.70, and the Abbe constant of these first lens L1 is 55.5; The radius-of-curvature of the convex surface S4 towards object space of these second lens L2 is 6.831 (from object spaces to image space), the radius-of-curvature of the convex surface S5 towards image space of these second lens L2 is-12.690 (from object spaces to image space), the refractive index of these second lens L2 is 1.80, the Abbe constant of these second lens L2 is 46.6, MTF then according to the optical lens of the present invention the 8th preferred embodiment separates image curve as shown in figure 30, as shown in figure 31, the distortion curve figure of this optical lens as shown in figure 32 for the astigmatism curve map of this optical lens.Therefore, this optical lens has good optical property, as shown in Figure 30 to Figure 32 of accompanying drawing.
Table 10A: the parameter of each lens of optical lens
| Face sequence number | Radius of curvature R | Center thickness D | Refractive index Nd | Abbe constant Vd |
| S1 | -6.255 | 0.800 | 1.70 | 55.5 |
| S2 | 4.004 | 1.633 | ||
| STO | Infinity | 0.000 | ||
| S4 | 6.831 | 3.800 | 1.80 | 46.6 |
| S5 | -12.690 | 0.300 | ||
| S6 | 5.860 | 0.650 | 1.78 | 25.7 |
| S7 | 3.070 | 2.400 | ||
| S7′ | 3.070 | 2.400 | 1.50 | 81.6 |
| S8 | -8.319 | 0.807 | ||
| S9 | 21.403 | 1.500 | 1.51 | 63.8 |
| S10 | -29.443 | 0.500 | ||
| S11 | Infinity | 0.950 | 1.52 | 64.2 |
| S12 | Infinity | 4.837 | ||
| IMA | Infinity |
Table 11A: the parameter of each lens of optical lens
| Nd(1) | Vd(1) | Nd(2) | Vd(2) | F1 | F | TTL | F1/F | TTL/F |
| 1.7 | 55.5 | 1.8 | 46.6 | -3.38 | 4.40 | 18.18 | -0.77 | 4.13 |
Alternatively, the 5th lens L5 has at least one aspheric surface, and this aspheric surface meets following formula:
Wherein, Z (h) for aspheric surface along optical axis direction when being highly the position of h, apart from the distance rise on this aspheric surface summit, c=1/r, r represents the radius-of-curvature of aspherical mirror, k is circular cone coefficient conic, and A, B, C, D, E are high order aspheric surface coefficient, and wherein the parameters that relates to of above-mentioned formula is as following table 12A:
Table 12A
| Surf | K | A | B | C | D | E |
| 9 | -48.00451 | -5.33681E-03 | 8.77024E-05 | -1.02961E-04 | 1.11426E-05 | -5.61961E-07 |
| 10 | -100 | -5.22017E-03 | 2.55546E-05 | -8.01754E-05 | 1.09726E-05 | -6.66770E-07 |
In other words, at least one convex surface in two convex surfaces of the 5th lens L5 is aspheric surface, to improve solution picture and the imaging performance of this optical lens, thus the optical lens according to the present invention the 8th preferred embodiment is made to be suitable for being miniaturized and having better imaging performance.
In sum, the optical lens according to the present invention the 8th preferred embodiment under the prerequisite of high pixel, little distortion, high resolution imaging, can realize the miniaturization of whole optical lens, is suitable for being used in automotive field to make it.In addition, according to the optimum configurations of each lens of the optical lens of the present invention the 8th preferred embodiment, it can be made to be set up and to adopt the insensitive material of temperature variation, as glass material is made, stablize to make its retention in the environment that temperature variation is larger.In other words, the optical lens of the present invention the 8th preferred embodiment can be set up the lens combination with minimum five lens composition, to realize high pixel, little distortion, high resolution imaging, and this optical lens can be set up miniaturization and can be stable into picture in large-temperature range.
Shown in Figure 33 to Figure 36 of reference accompanying drawing of the present invention, optical lens according to the present invention the 9th preferred embodiment is illustrated, wherein this optical lens comprises at least one first lens L1, at least one second lens L2, the 3rd lens L3, the 4th lens L4 and a 5th lens L5, wherein these first lens L1 has negative power, these second lens L2 has positive light coke, 3rd lens L3 and the 4th lens L4 forms an achromat group, 5th lens L5 is for having positive light coke, and the 5th lens L5 has at least one aspheric surface.In other words, the 5th lens L5 is aspheric mirror.Preferably, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are aspheric mirror, to improve the optical property of the optical lens according to the present invention the 9th preferred embodiment.Alternatively, these first lens L1, these second lens L2, the 3rd lens L3 and/or the 4th lens L4 are spherical mirror.
As shown in Figure 33 of accompanying drawing, these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 form a front lens group and a rear lens group, wherein this front lens group at least comprises the first lens L1, this rear lens group at least comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5, and wherein this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.In other words, this front lens group can be formed by these first lens L1, also can be formed by these first lens L1 and these second lens L2, wherein when this front lens group is formed by these first lens L1, this rear lens group comprises these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5; When this front lens group is formed by these first lens L1 and these second lens L2, this rear lens group comprises the 3rd lens L3, the 4th lens L4 and the 5th lens L5.
As shown in Figure 33 of accompanying drawing, this front lens group can be formed by these first lens L1, and this rear lens group is formed by these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5.Preferably, this front lens group and this rear lens group edge are sequentially set in direction from the object side to the image side.More preferably, these second lens L2 of these first lens L1 of this front lens group and this rear lens group, this achromat group and the 5th lens L5 are sequentially set along direction from the object side to the image side.
As shown in Figure 33 of accompanying drawing, the photocentre according to these first lens L1 of the optical lens of the present invention the 9th preferred embodiment, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.
As shown in Figure 33 of accompanying drawing, optical lens according to the present invention the 9th preferred embodiment comprises a diaphragm L6 further, wherein front lens group and rear lens group can be set up and lay respectively at diaphragm both sides, and wherein the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.Preferably, this diaphragm L6 is arranged between this first lens L1 and these second lens L2, as shown in Figure 33 of accompanying drawing.Alternatively, this diaphragm L6 is arranged between this second lens L2 and the 3rd lens L3.
Alternatively, this diaphragm L6 is arranged on this rear lens group, and the photocentre of the photocentre of this diaphragm L6 and these first lens L1, these second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 is coaxial.In certain embodiments, this diaphragm L6 also can be arranged between this achromat group and the 5th lens L5.Alternatively, this diaphragm L6 also can be arranged on this achromat group, as being arranged between the 3rd lens L3 and the 4th lens L4.In further embodiments, this diaphragm L6 is arranged between this front lens group and this rear lens group.
Be understandable that, the concave-concave shape of these first lens L1 makes the optical lens of the present invention the 9th preferred embodiment have a larger aperture, is beneficial to the front end optic diameter reducing this optical lens, thus meets small form factor requirements and reduce costs.Especially, when this diaphragm L6 is arranged on this first lens L1 and these second lens L2, the concave-concave shape of these first lens L1 allows the imaging within the scope of greater angle to enter this first lens L1 and by this diaphragm L6.Meanwhile, these second lens L2 has positive light coke, thus is beneficial to the light (refer to and penetrate from these first lens L1 the light come) converging front and disperse, to be conducive to the rectification of aberration.
Further, the focal length of these first lens L1 is F1, and the focal length according to the optical lens of the present invention the 9th preferred embodiment is F, then-0.5 >=F1/F >=-2, as shown in table 13A and table 14A.
As shown in Figure 33 of accompanying drawing, these first lens L1 according to the optical lens of the present invention the 9th preferred embodiment has two concave surfaces S1, S2, these second lens L2 has two convex surfaces S4, S5, wherein two concave surfaces S1, S2 of these first lens L1 are respectively towards object space and image space, and two convex surfaces S4, S5 of these second lens L2 are respectively towards object space and image space.As shown in Figure 33 of accompanying drawing, these first lens L1 is configured to make its concave surface S1 towards object space, and this concave surface S2 is towards image space, and these second lens L2 is configured to make its convex surface S4 towards object space, and this convex surface S5 is towards image space.As shown in Figure 33 of accompanying drawing, further, the 3rd lens L3 according to the optical lens of the present invention the 9th preferred embodiment has two convex surfaces S6, S7,4th lens L4 has two concave surface S7 ', S8, wherein two convex surfaces S6, S7 of the 3rd lens L3 are respectively towards object space and image space, this concave surface S7 ' of the 4th lens L4 is towards object space, this concave surface S8 of the 4th lens L4 is towards image space, and wherein the 3rd lens L3 is set up towards the convex surface S7 of image space and the 4th lens L4 towards the concave surface S7 ' of object space opposite of practising physiognomy.In other words, two-sided lens is according to these first lens L1 of the optical lens of the present invention the 9th preferred embodiment, these second lens L2, the 3rd lens L3 and the 4th lens L4.As shown in Figure 33 of accompanying drawing, the 3rd lens L3 is configured to make its convex surface S6 towards object space, and this convex surface S7 is towards image space, and the 4th lens L4 is configured to make its concave surface S7 ' towards object space, and this convex surface S8 is towards image space.Therefore, these first lens L1 is a biconcave lens, and these second lens L2 is a biconvex lens, and the 3rd lens L3 is a biconvex lens, and the 4th lens L4 is a biconcave lens.As shown in Figure 33 of accompanying drawing, the 5th lens L5 according to the optical lens of the present invention the 9th preferred embodiment has two surperficial S9, S10, wherein two surperficial S9, S10 of the 5th lens L5 are respectively towards object space and image space, and at least one in two surperficial S9, S10 of wherein the 5th lens L5 is aspheric surface.In other words, the 5th lens L5 is two-sided lens, and has at least one aspheric surface.Preferably, a surperficial S9 of the 5th lens L5 is towards object space, and another surperficial S10 is towards image space.More preferably, one in two surperficial S9, S10 of the 5th lens L5 is convex surface, and another is concave surface, and wherein this convex surface S9 of the 5th lens L5 is towards object space, and this concave surface S10 of the 5th lens L5 is towards image space.Alternatively, one in two surperficial S9, S10 of the 5th lens L5 is convex surface, and another is plane.
As shown in Figure 33 of accompanying drawing, this achromat group according to the optical lens of the present invention the 9th preferred embodiment is balsaming lens.In other words, the 3rd lens L3 and the 4th lens L4 is glued together, to form this achromat group.Now, because the 3rd lens L3 and the 4th lens L4 is glued together, therefore, together with the convex surface S7 of the 3rd lens L3 coincides with the concave surface S7 ' of the 4th lens L4.Now, the convex surface S7 of the 3rd lens L3 and the concave surface S7 ' of the 4th lens L4 is set up opposite of practising physiognomy.Alternatively, this achromat group also can be two divergence type achromat groups.Be understandable that, when this achromat group is two divergence type achromat group, the 3rd lens L3 and the 4th lens L4 is set up separately, then this diaphragm L6 can be arranged between the 3rd lens L3 and the 4th lens L4.
It should be noted that these first lens L1 can be made up of glass material, the material that also can have good light permeability energy by other is made.It will be appreciated by those skilled in the art that, when the refractive index of these first lens L1 is too high, then imaging is by after these first lens L1, can be dispersed excessive, so that subsequent lens, as the second lens L2 have to be configured to have a high index of refraction, heavy caliber and/or comparatively heavy thickness to converge light.Therefore, according to the refractive index Nd (1)≤1.85 of these first lens L1 of the optical lens of the present invention the 9th preferred embodiment, to avoid imaging too to disperse, as shown in table 13A and table 14A.In other words, the refractive index making the material of these first lens L1 is not more than 1.85.In addition, in order to avoid imaging is excessive by the aberration after these first lens L1, the Abbe constant Vd (1) >=40 of the material of these first lens L1 is limited, as shown in table 13A and table 14A.In order to converge by the imaging of these first lens L1 and dispersing further of suppression imaging, to make to be transferred to this rear lens group reposefully by the imaging of these first lens L1, then these second lens L2 is set up and has higher refractive index, therefore, the refractive index of these second lens L2 is Nd (2), then Nd (2) >=1.55, as shown in table 13A and table 14A.In other words, the refractive index making the material of these second lens L2 is not less than 1.55.In addition, these second lens L2 is set up has Abbe constant Vd (2), then 20≤Vd (2)≤65, effectively to correct the axial chromatic aberation of imaging, as shown in table 13A and table 14A.
Simultaneously, due to the refractive index Nd (1)≤1.85 of these first lens L1, Abbe constant Vd (1) >=40, the refractive index Nd (2) >=1.55 of these second lens L2, Abbe constant 20≤Vd (2)≤65, therefore these first lens L1 and these second lens L2 all can be made up of more cheap glass material.
Therefore, be set up according to the front lens group of the optical lens of the present invention the 9th preferred embodiment and rear lens group, thus the ratio of the total length TTL of this optical lens and the focal length F of this optical lens can be met: TTL/F≤7.5, wherein the total length TTL of this optical lens refer to from the first lens L1 towards the concave surface of object space to the distance of imaging surface.
As shown in following table 13A and table 14A, optical lens according to the present invention the 9th preferred embodiment can be set to the radius-of-curvature of the concave surface S1 towards object space of these first lens L1 for-13.627 (from object spaces to image space), the radius-of-curvature of the concave surface S2 towards image space of these first lens L1 is 3.363 (from object spaces to image space), the refractive index of these first lens L1 is 1.64, and the Abbe constant of these first lens L1 is 55.6; The radius-of-curvature of the convex surface S4 towards object space of these second lens L2 is 6.667 (from object spaces to image space), the radius-of-curvature of the convex surface S5 towards image space of these second lens L2 is-7.310 (from object spaces to image space), the refractive index of these second lens L2 is 1.59, the Abbe constant of these second lens L2 is 60.6, MTF then according to the optical lens of the present invention the 9th preferred embodiment separates image curve as shown in figure 34, as shown in figure 35, the distortion curve figure of this optical lens as shown in figure 36 for the astigmatism curve map of this optical lens.Therefore, this optical lens has good optical property, as shown in Figure 34 to Figure 36 of accompanying drawing.
Table 13A: the parameter of each lens of optical lens
| Face sequence number | Radius of curvature R | Center thickness D | Refractive index Nd | Abbe constant Vd |
| S1 | -13.627 | 0.800 | 1.64 | 55.6 |
| S2 | 3.363 | 2.721 |
| STO | Infinity | 0.000 | ||
| S4 | 6.667 | 4.400 | 1.59 | 60.6 |
| S5 | -7.310 | 0.300 | ||
| S6 | 4.081 | 3.600 | 1.50 | 81.6 |
| S7 | -4.501 | 0.650 | ||
| S7′ | -4.501 | 0.650 | 1.75 | 52.3 |
| S8 | 58.260 | 0.180 | ||
| S9 | 6.983 | 2.000 | 1.51 | 63.8 |
| S10 | 9.823 | 0.500 | ||
| S11 | Infinity | 0.950 | 1.52 | 64.2 |
| S12 | Infinity | 1.763 | ||
| IMA | Infinity |
Table 14A: the parameter of each lens of optical lens
| Nd(1) | Vd(1) | Nd(2) | Vd(2) | F1 | F | TTL | F1/F | TTL/F |
| 1.64 | 55.6 | 1.59 | 60.6 | -4.13 | 3.88 | 17.86 | -1.06 | 4.60 |
Alternatively, the 5th lens L5 has at least one aspheric surface, and this aspheric surface meets following formula:
Wherein, Z (h) for aspheric surface along optical axis direction when being highly the position of h, apart from the distance rise on this aspheric surface summit, c=1/r, r represents the radius-of-curvature of aspherical mirror, k is circular cone coefficient conic, and A, B, C, D, E are high order aspheric surface coefficient, and wherein the parameters that relates to of above-mentioned formula is as following table 15A:
Table 15A
| Surf | K | A | B | C | D | E |
| 9 | -18.79164 | -3.14487E-03 | -3.58652E-04 | -7.76989E-05 | 3.92281E-05 | -1.17564E-06 |
| 10 | -152.6418 | 1.62760E-03 | -2.19156E-03 | 6.79365E-04 | -4.90585E-05 | 1.04592E-06 |
In other words, at least one surface (S9 or S10) in two surperficial S9, S10 of 5th lens L5 is aspheric surface, to improve solution picture and the imaging performance of the 5th lens L5, thus the optical lens according to the present invention the 9th preferred embodiment is made to be suitable for being miniaturized and having better imaging performance.
In sum, the optical lens according to the present invention the 9th preferred embodiment under the prerequisite of high pixel, little distortion, high resolution imaging, can realize the miniaturization of whole optical lens, is suitable for being used in automotive field to make it.In addition, according to the optimum configurations of each lens of the optical lens of the present invention the 9th preferred embodiment, it can be made to be set up and to adopt the insensitive material of temperature variation, as glass material is made, stablize to make its retention in the environment that temperature variation is larger.In other words, the optical lens of the present invention the 9th preferred embodiment can be set up the lens combination with minimum five lens composition, to realize high pixel, little distortion, high resolution imaging, and this optical lens can be set up miniaturization and can be stable into picture in large-temperature range.It shown in accompanying drawing is only to example of the present invention instead of restriction with the embodiment of the present invention described above that those skilled in the art can understand.
Can see that the object of the invention can fully effectively be completed thus.For explaining that this embodiment of function and structure principle of the present invention has been absolutely proved and described, and the present invention is not by the restriction based on the change on these embodiment basis.Therefore, the present invention includes all modifications be encompassed within appended claims book claimed range and spirit.
Claims (48)
1. an optical lens, is characterized in that, comprising:
First lens, wherein said first lens have negative power;
Second lens, wherein said second lens have positive light coke;
3rd lens;
4th lens, wherein said 3rd lens and described 4th lens form an achromat group; With
5th lens, wherein said 5th lens have positive light coke, and wherein said 5th lens have two surfaces, and at least one surface in described two surfaces of described 5th lens is aspheric surface.
2. optical lens according to claim 1, it is characterized in that, described first lens, described second lens, described 3rd lens, described 4th lens and described 5th lens forming front lens group and a rear lens group, wherein said front lens group at least comprises the first lens, described rear lens group at least comprises described 3rd lens, described 4th lens and described 5th lens, and wherein said front lens group and described rear lens group edge are sequentially set in direction from the object side to the image side.
3. optical lens according to claim 1, is characterized in that, the photocentre of described first lens, described second lens, described 3rd lens, described 4th lens and described 5th lens is coaxial.
4. optical lens according to claim 2, is characterized in that, the photocentre of described first lens, described second lens, described 3rd lens, described 4th lens and described 5th lens is coaxial.
5. optical lens according to claim 3, is characterized in that, comprise a diaphragm further, wherein said diaphragm is arranged on described front lens group, and the photocentre of the photocentre of described diaphragm and described first lens and described second lens is coaxial.
6. optical lens according to claim 4, is characterized in that, comprise a diaphragm further, wherein said diaphragm is arranged on described front lens group, and the photocentre of the photocentre of described diaphragm and described first lens and described second lens is coaxial.
7. optical lens according to claim 1, it is characterized in that, described first lens have two concave surfaces, and described second lens have two convex surfaces, two concave surfaces of wherein said first lens are respectively towards object space and image space, and two convex surfaces of described second lens are respectively towards object space and image space.
8. optical lens according to claim 6, it is characterized in that, described first lens have two concave surfaces, and described second lens have two convex surfaces, two concave surfaces of wherein said first lens are respectively towards object space and image space, and two convex surfaces of described second lens are respectively towards object space and image space.
9. optical lens according to claim 1, it is characterized in that, described first lens have two concave surfaces, described second lens have two convex surfaces, described 3rd lens have two convex surfaces, described 4th lens have a concave surface and a convex surface, two concave surfaces of wherein said first lens are respectively towards object space and image space, two convex surfaces of described second lens are respectively towards object space and image space, two convex surfaces of described 3rd lens are respectively towards object space and image space, the described concave surface facing object space of described 4th lens, described 4th lens described convex surface facing image space, described two surfaces of described 5th lens are respectively towards object space and image space, wherein said 3rd lens are set up towards the concave surface of object space opposite of practising physiognomy towards the convex surface of image space and described 4th lens.
10. optical lens according to claim 8, it is characterized in that, described 3rd lens have two convex surfaces, described 4th lens have a concave surface and a convex surface, two convex surfaces of wherein said 3rd lens are respectively towards object space and image space, the described concave surface facing object space of described 4th lens, described 4th lens described convex surface facing image space, described two surfaces of described 5th lens are respectively towards object space and image space, and wherein said 3rd lens are set up towards the concave surface of object space opposite of practising physiognomy towards the convex surface of image space and described 4th lens.
11. optical lens according to claim 1, it is characterized in that, described first lens have two concave surfaces, described second lens have two convex surfaces, described 3rd lens have a convex surface and a concave surface, described 4th lens have two convex surfaces, two concave surfaces of wherein said first lens are respectively towards object space and image space, two convex surfaces of described second lens are respectively towards object space and image space, described 3rd lens convex surface facing object space, the concave surface facing image space of described 3rd lens, two convex surfaces of described 4th lens are respectively towards object space and image space, described two surfaces of described 5th lens are respectively towards object space and image space, wherein said 3rd lens are set up towards the convex surface of image space opposite of practising physiognomy towards the concave surface of image space and described 4th lens.
12. optical lens according to claim 8, it is characterized in that, described 3rd lens have a convex surface and a concave surface, described 4th lens have two convex surfaces, wherein said 3rd lens convex surface facing object space, the concave surface facing image space of described 3rd lens, two convex surfaces of described 4th lens are respectively towards object space and image space, described two surfaces of described 5th lens are respectively towards object space and image space, and wherein said 3rd lens are set up towards the convex surface of image space opposite of practising physiognomy towards the concave surface of image space and described 4th lens.
13. optical lens according to claim 9,10,11 or 12, it is characterized in that, described two surfaces of described 5th lens are convex surface.
14. optical lens according to claim 9,10,11 or 12, it is characterized in that, a surface in described two surfaces of described 5th lens is convex surface, and another surface is plane.
15. optical lens according to claim 1, it is characterized in that, described first lens have two concave surfaces, described second lens have two convex surfaces, described 3rd lens have two convex surfaces, described 4th lens have two concave surfaces, two concave surfaces of wherein said first lens are respectively towards object space and image space, two convex surfaces of described second lens are respectively towards object space and image space, two convex surfaces of described 3rd lens are respectively towards object space and image space, two concave surfaces of described 4th lens are respectively towards object space and image space, described 5th lens convex surface facing object space, described two surfaces of described 5th lens are respectively towards object space and image space, wherein said 3rd lens are set up towards the concave surface of image space opposite of practising physiognomy towards the convex surface of object space and described 4th lens.
16. optical lens according to claim 8, it is characterized in that, described 3rd lens have two convex surfaces, described 4th lens have two concave surfaces, two convex surfaces of wherein said 3rd lens are respectively towards object space and image space, two concave surfaces of described 4th lens are respectively towards object space and image space, described 5th lens convex surface facing object space, described two surfaces of described 5th lens are respectively towards object space and image space, and wherein said 3rd lens are set up towards the concave surface of image space opposite of practising physiognomy towards the convex surface of object space and described 4th lens.
17. optical lens according to claim 15 or 16, it is characterized in that, a surface in described two surfaces of described 5th lens is convex surface, and another surface is concave surface, wherein said 5th lens described convex surface facing object space, the described concave surface facing image space of described 5th lens.
18. optical lens according to claim 15 or 16, it is characterized in that, a surface in described two surfaces of described 5th lens is convex surface, and another surface is plane.
19. optical lens according to claim 2,3 or 4, it is characterized in that, comprise a diaphragm further, wherein said diaphragm is arranged on described rear lens group, and the photocentre of the photocentre of described diaphragm and described 3rd lens, described 4th lens and described 5th lens is coaxial.
20. optical lens according to claim 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17 or 18, it is characterized in that, described first lens, described second lens, described 3rd lens, described 4th lens and described 5th lens edge are sequentially set in direction from the object side to the image side.
21. optical lens according to claim 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17 or 18, it is characterized in that, the refractive index Nd (1)≤1.85 of described first lens, the Abbe constant Vd (1) >=40 of described first lens.
22. optical lens according to claim 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17 or 18, is characterized in that, the focal length F1 of described first lens and the focal length F of described optical lens meets:
-0.5≥F1/F≥-2。
23. optical lens according to claim 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17 or 18, it is characterized in that, the refractive index Nd (2) >=1.55 of described second lens, the Abbe constant Vd (2)≤65 of described second lens.
24. optical lens according to claim 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17 or 18, it is characterized in that, the camera lens overall length TTL of described optical lens and the focal length F of described optical lens meets: TTL/F≤7.5.
25. optical lens according to claim 1, it is characterized in that, described first lens have two concave surfaces, described second lens have two convex surfaces, described 3rd lens have two convex surfaces, described 4th lens have two concave surfaces, described 5th lens have two surfaces, two concave surfaces of wherein said first lens are respectively towards object space and image space, two convex surfaces of described second lens are respectively towards object space and image space, two convex surfaces of described 3rd lens are respectively towards object space and image space, two concave surfaces of described 4th lens are respectively towards object space and image space, two surfaces of described 5th lens are respectively towards object space and image space, wherein said 3rd lens are set up towards the concave surface of object space opposite of practising physiognomy towards the convex surface of image space and described 4th lens.
26. optical lens according to claim 8, it is characterized in that, described 3rd lens have two convex surfaces, described 4th lens have two concave surfaces, described 5th lens have two surfaces, two convex surfaces of wherein said 3rd lens are respectively towards object space and image space, two concave surfaces of described 4th lens are respectively towards object space and image space, two surfaces of described 5th lens are respectively towards object space and image space, and wherein said 3rd lens are set up towards the concave surface of object space opposite of practising physiognomy towards the convex surface of image space and described 4th lens.
27. optical lens according to claim 25 or 26, it is characterized in that, a surface in described two surfaces of described 5th lens is concave surface, and another surface is convex surface.
28. optical lens according to claim 1, it is characterized in that, described first lens have two concave surfaces, described second lens have two convex surfaces, described 3rd lens have two concave surfaces, described 4th lens have two convex surfaces, described 5th lens have two surfaces, two concave surfaces of wherein said first lens are respectively towards object space and image space, two convex surfaces of described second lens are respectively towards object space and image space, two convex surfaces of described 3rd lens are respectively towards object space and image space, two concave surfaces of described 4th lens are respectively towards object space and image space, two surfaces of described 5th lens are respectively towards object space and image space, wherein said 3rd lens are set up towards the convex surface of image space opposite of practising physiognomy towards the concave surface of object space and described 4th lens.
29. optical lens according to claim 8, it is characterized in that, described 3rd lens have two concave surfaces, described 4th lens have two convex surfaces, described 5th lens have two surfaces, two concave surfaces of described 3rd lens are respectively towards object space and image space, two convex surfaces of described 4th lens are respectively towards object space and image space, two surfaces of described 5th lens are respectively towards object space and image space, and wherein said 3rd lens are set up towards the convex surface of image space opposite of practising physiognomy towards the concave surface of object space and described 4th lens.
30. optical lens according to claim 28 or 29, it is characterized in that, a surface in described two surfaces of described 5th lens is concave surface, and another surface is convex surface, and described 5th lens is described convex surface facing object space, the described concave surface facing image space of described lens.
31. optical lens according to claim 25,26,27,28,29 or 30, it is characterized in that, described first lens, described second lens, described 3rd lens, described 4th lens and described 5th lens edge are sequentially set in direction from the object side to the image side.
32. optical lens according to claim 25,26,27,28,29 or 30, is characterized in that, the refractive index Nd (1)≤1.8 of these the first lens, the Abbe constant Vd (1) >=40 of these the first lens.
33. optical lens according to claim 32, is characterized in that, the refractive index Nd (1)≤1.65 of these the first lens, the Abbe constant Vd (1) >=55 of these the first lens.
34. optical lens according to claim 25,26,27,28,29,30,31,32 or 33, is characterized in that, the focal length F1 of these the first lens and the focal length F of this optical lens meets:
-0.9≥F1/F≥-2。
35. the optical lens according to claim 25,26,27,28,29,30,31,32 or 33, is characterized in that, the refractive index Nd (2) >=1.73 of these the second lens, the Abbe constant Vd (2) >=40 of these the second lens.
36. optical lens according to claim 25,26,27,28,29,30,31,32 or 33, is characterized in that, the camera lens overall length TTL of this optical lens and the focal length F of this optical lens meets: TTL/F≤6.5.
37. optical lens according to claim 25,26,27,28,29,30,31,32 or 33, it is characterized in that, the focal length F (afterwards) of the focal length F (front) of the front lens group of this optical lens, the rear lens group of this optical lens and the focal length F of this optical lens meets: 4.5 >=F (front)/F >=1.3 and 5 >=F (afterwards)/F >=1.5.
38. 1 kinds of optical lens, is characterized in that, comprise successively from the object side to the image side: have the front lens group of positive light coke, aperture member, have the rear lens group of positive light coke;
Wherein, described front lens group comprises from the object side to the image side successively: the first lens, the second lens, and described first lens are the biconcave lens with negative power, and described second lens are the biconvex lens with positive light coke; Described rear lens group comprises from the object side to the image side successively: the 3rd lens, the 4th lens and the 5th lens, described 3rd lens and the 4th lens form a balsaming lens, described 5th lens are the aspheric mirror with positive light coke, and the shape of the 5th lens is two concave surface facing identical falcates.
39. according to a kind of optical lens according to claim 38, it is characterized in that, the 3rd lens in described balsaming lens have positive light coke and are biconvex shape, and the 4th lens in described balsaming lens have negative power and are concave-concave shape, two concave surface facing object spaces of described 5th lens.
40. according to a kind of optical lens according to claim 38, it is characterized in that, the 3rd lens in described balsaming lens have negative power and are concave-concave shape, and the 4th lens in described balsaming lens have positive light coke and are biconvex shape, two concave surface facing image spaces of described 5th lens.
41., according to a kind of optical lens according to claim 38, is characterized in that, described first lens meet following formula:
Nd(1)≤1.65，Vd(1)≥55
Wherein, Nd (1) is the refractive index of the material of the first lens, and Vd (1) is the Abbe constant of the material of the first lens.
42., according to a kind of optical lens according to claim 38, is characterized in that, described first lens meet following formula:
-0.9≥F1/F≥-2.0
Wherein, F1 is the focal length value of the first lens, and F represents whole group of focal length value of described optical lens.
43., according to a kind of optical lens according to claim 38, is characterized in that, described second lens meet following formula:
Nd(2)≥1.73，Vd(2)≥40
Wherein, Nd (2) is the refractive index of the material of the second lens, and Vd (2) is the Abbe constant of the material of the second lens.
44., according to a kind of optical lens according to claim 38, is characterized in that, whole group of focal length value of the focal length of described front lens group, the focal length of rear lens group and described optical lens meets following formula:
2.5 >=F (front)/F >=1.3,3 >=F (afterwards)/F >=1.5
Wherein, F (front) is the focal length value of front lens group, and F (afterwards) represents the focal length value of rear lens group, and F represents whole group of focal length value of described optical lens.
45., according to a kind of optical lens according to claim 38, is characterized in that, described 5th lens meet following formula:
| r9-r10| < 2, and F5/F > 2
Wherein, r9 be the 5th lens thing side to radius value, r10 is the radius value in the 5th direction, lens image side, and F5 is the focal length value of the 5th lens, and F represents whole group of focal length value of described optical lens.
46., according to a kind of optical lens according to claim 38, is characterized in that, the optical length of described optical lens meets the following conditions:
TTL/F≤4.5
Wherein, TTL represents the optical length of described optical lens, and namely the object space side outermost point of the first lens of described optical lens is to the distance of imaging focal plane of described optical lens, and F represents whole group of focal length value of described optical lens;
The f-number FNO of described optical lens meets following formula:
FNO≤1.8
Total field angle FOV of described optical lens meets following formula:
80°≥FOV≥40°
The maximum clear aperture of described first lens and the field angle of corresponding imaging image height and described optical lens meet following formula:
D/h/FOV≤0.025
Wherein, FOV represents the maximum field of view angle of described optical lens, and d represents the maximum clear aperture of the first lens corresponding to maximum FOV towards the concave surface of object space, and h represents the imaging image height corresponding to maximum FOV.
47., according to a kind of optical lens according to claim 38, is characterized in that, described first lens, the second lens, the 3rd lens and the 4th lens are spherical glass eyeglass, and described 5th lens are plastic aspherical element eyeglass.
48., according to a kind of optical lens according to claim 38, is characterized in that, described first lens, the second lens are spherical glass eyeglass, and described 3rd lens, the 4th lens and the 5th lens are plastic aspherical element eyeglass.
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| CN105527694B (en) | 2020-12-22 |
| CN206209180U (en) | 2017-05-31 |
| CN104297906A (en) | 2015-01-21 |
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