CN104407431A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN104407431A CN104407431A CN201410734104.5A CN201410734104A CN104407431A CN 104407431 A CN104407431 A CN 104407431A CN 201410734104 A CN201410734104 A CN 201410734104A CN 104407431 A CN104407431 A CN 104407431A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 167
- 238000003384 imaging method Methods 0.000 claims abstract description 28
- 239000000571 coke Substances 0.000 claims description 42
- 239000000463 material Substances 0.000 claims description 30
- 239000011521 glass Substances 0.000 claims description 4
- 230000004075 alteration Effects 0.000 abstract description 14
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 201000009310 astigmatism Diseases 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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Abstract
The invention relates to an optimal lens. The optical lens sequentially comprises a front lens group, a diaphragm element and a rear lens group from an object space to an image space, wherein the front lens group has positive focal power; the rear lens group has positive focal power; the front lens group sequentially comprises a crescent first lens and a double-convex second lens from the object space to the image space; the crescent first lens has negative focal power; a concave surface of the crescent first lens faces the image space; the double-convex second lens has positive focal power; the rear lens group sequentially comprises a double-concave third lens, a crescent fourth lens and a balsaming lens; the double-concave third lens has negative focal power; the crescent fourth lens has positive focal power; a concave surface of the crescent fourth lens faces the object space; the balsaming lens consists of a fifth lens and the sixth lens. The requirements of high pixel, small distortion, large aperture, high light transmitting performance and accordance with high definition are met under the conditions of low cost and small miniaturization are realized; various aberrations of an optical system are effectively corrected; meanwhile, perfect imaging definition can be kept in the temperature of -40DEGC to 85DEG C; the optical lens is specially suitable for monitoring or vehicle-mounted camera systems considering daytime and nighttime or poor illuminating conditions.
Description
Technical field
The present invention relates to optical image technology field, particularly relate to a kind of optical lens.
Background technology
Along with the development of auto industry active safety, the requirement of vehicle-mounted front view lens is improved constantly.The particularly restriction of camera assembling space, makes the trend toward miniaturization of camera lens day by day obvious.Under maintenance lens distortion little, mega pixel, wide-aperture prerequisite, require that the overall length of camera lens is more short better.Meanwhile, possess low cost and more perfect imaging definition can be kept in the temperature range of-40 DEG C ~+85 DEG C.
At present wide-angle Indoor Video on the market and in-vehicle camera camera lens can't realize the miniaturization of camera lens under the prerequisite meeting low cost, high pixel, little, the large aperture imaging of distorting.
Summary of the invention
The object of the 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, and perfect imaging is still kept 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.
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 have negative power and the crescent lens of concave surface facing image space, 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, the 5th lens and the 6th lens, described 3rd lens are the biconcave lens with negative power, described 4th lens are have positive light coke and the crescent lens of concave surface facing object space, and described 5th lens and the 6th lens form a balsaming lens;
Wherein, the lens with positive light coke in described balsaming lens meet condition below:
Vd (just) > 72, and dn/dt (just) <-5*10
-6
Wherein, Vd (just) refers to the Abbe constant with the material of the lens of positive light coke in described balsaming lens, and dn/dt (just) refers to the temperature variant variable quantity of the refractive index with the lens of positive light coke in described balsaming lens.
Wherein, the 5th lens in described balsaming lens are have negative power and the crescent lens of concave surface facing image space, and the 6th lens in described balsaming lens are the biconvex lens with positive light coke.
Wherein, the 5th lens in described balsaming lens are the biconvex lens with positive light coke, and the 6th lens in described balsaming lens are have negative power and the crescent lens of concave surface facing object space.
Wherein, whole group of focal length value of the focal length value with the lens of positive light coke in described balsaming lens and described optical lens meets following formula:
1.6 >=F (just)/F >=1.2
Wherein, F (just) refers to the focal length value with the lens of positive light coke in described balsaming lens, and F represents whole group of focal length value of described optical lens.
Wherein, described first lens meet following formula:
Nd(1)≤1.65，Vd(1)≥55，-0.9≥F1/F≥-1.8
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, and F1 is the focal length value of the first lens, and F is whole group of focal length value of described optical lens.
Wherein, described second lens meet following formula:
Nd(2)≥1.8，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:
2.7 >=F (front)/F >=1.8,2.0 >=F (afterwards)/F >=1.2
Wherein, F (front) represents 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, after the optical length of described optical lens and optics, Jiao meets the following conditions:
TTL/F≤3.5，BFL/F≥0.9
Wherein, TTL represents the optical length of described optical lens, 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, BFL is burnt after representing the optics of described optical lens, namely the image side outermost point of the 6th 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.
Wherein, 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≤0.02
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 curved surface of object space, and h represents the imaging image height corresponding to maximum FOV.
Wherein, described first lens all adopt glass material to the 6th lens, and wherein, the lens with negative power in the second lens, the 3rd lens, the 4th lens and balsaming lens all adopt the material of high index of refraction.
Beneficial effect:
A kind of optical lens of the present invention, by adopting 6 lens structures, under the requirement condition meeting low cost, miniaturization, achieve high pixel, little, the large aperture of distorting, high pass optical property and meet high definition requirement, and effectively correct the various aberrations of optical system, simultaneously 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.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of optical lens that the specific embodiment of the invention provides.
Fig. 2 is that the MTF of optical lens in Fig. 1 separates image curve.
Fig. 3 is the astigmatism curve map of optical lens in Fig. 1.
Fig. 4 is the distortion curve figure of optical lens in Fig. 1.
Fig. 5 is the structural representation of the another kind of optical lens that the specific embodiment of the invention provides.
Fig. 6 is that the MTF of optical lens in Fig. 5 separates image curve.
Fig. 7 is the astigmatism curve map of optical lens in Fig. 5.
Fig. 8 is the distortion curve figure of optical lens in Fig. 5.
In figure:
L1-first lens; L2-second lens; L3-the 3rd lens; L4-the 4th lens; L5-the 5th lens; L6-the 6th lens; L7-aperture member; L8-color filter; L9-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; S8, S9-the 4th two sides of lens; S10, S11-the 5th two sides of lens; S11, S12-the 6th two sides of lens; The two sides of S13, S14-color filter.
Embodiment
Technical scheme of the present invention is further illustrated by embodiment below in conjunction with accompanying drawing.
Embodiment 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 L7, the rear lens group with positive light coke, color filter L8 and imaging surface L9;
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 has negative power and the crescent lens of concave surface facing image space, 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, the 5th lens L5 and the 6th lens L6, described 3rd lens L3 is the biconcave lens with negative power, described 4th lens L4 has positive light coke and the crescent lens of concave surface facing object space, and described 5th lens L5 and the 6th lens L6 forms a balsaming lens.
The 5th lens L5 in described balsaming lens has negative power and the crescent lens of concave surface facing image space, and the 6th lens L6 in described balsaming lens is the biconvex lens with positive light coke.
In the present embodiment, described first lens L1 meets following formula:
Nd(1)≤1.65，Vd(1)≥55，-0.9≥F1/F≥-1.8
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.F1 is the focal length value of the first lens L1, and F represents whole group of focal length value of described optical lens.Lower refractive index can avoid the light of being come by object space after the first lens L1 of negative power light disperse excessive, the relatively whole lens combination of first lens L1 carries out focal power reasonable distribution, and the physical dimension of the first lens L1 and the aberration of optical lens whole system can be made to reach a balance preferably.
In the present embodiment, described second lens L2 meets following formula:
Nd(2)≥1.8，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.
In the present embodiment, the aperture member L7 of described optical lens is between the second lens L2 and the 3rd lens L3, the object done so not only can increase the aperture size of optical lens, the relative exposure performance of improving optical camera lens, and the bore of front lens group can be reduced, be conducive to optical lens miniaturization.
In the present embodiment, described 4th lens L4 has positive light coke and the crescent lens of concave surface facing object space.Wherein, the crescent lens arrangement of concave surface facing object space, can reduce the incident angle of Large visual angle light at the 4th lens L4, effectively reduces the senior aberration of optical lens.Meanwhile, the 4th lens L4 is positive power lens, by the reasonable distribution of focal power, can the aberration of balance optical camera lens, and effectively reduce the effective aperture of balsaming lens group.
In the present embodiment, whole group of focal length value of the focal length value with the lens of positive light coke in described balsaming lens and described optical lens meets following formula:
Dn/dt (just) <-5*10
-6/ DEG C, Vd (just) > 72,1.6>=F (just)/F>=1.2
Wherein, dn/dt (just) refers to the temperature variant variable quantity of the refractive index with the lens of positive light coke in described balsaming lens, Vd (just) refers to the Abbe constant with the material of the lens of positive light coke in described balsaming lens, F (just) refers to the focal length value with the lens of positive light coke in described balsaming lens, and F represents whole group of focal length value of described optical lens.Varied with temperature the reasonable distribution of characteristic by focal power and Refractive Index of Material, when realizing temperature rising, whole group of focal length of optical lens increases, burnt increase after the optics of optical lens; When temperature reduces, whole group of focal length of optical lens reduces, burnt reduction after the optics of optical lens.Thus to offset because structural member expands with heat and contract with cold burnt varying effect after the optics that causes, camera lens is in preferably on imaging surface L9 all the time, meets the resolution energy requirement that camera lens keeps mega pixel in the temperature range of-40 DEG C ~+85 DEG C.
In the present embodiment, 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:
2.7 >=F (front)/F >=1.8,2.0 >=F (afterwards)/F >=1.2
Wherein, F (front) represents 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.
After the optical length of described optical lens and optics, Jiao meets the following conditions:
TTL/F≤3.5，BFL/F≥0.9
Wherein, TTL represents the optical length of described optical lens, 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, BFL is burnt after representing the optics of described optical lens, namely the image side outermost point of the 6th lens L6 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≤0.02
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 curved surface of object space, and h represents the imaging image height corresponding to maximum FOV.
In the present embodiment, described first lens L1 all adopts glass material to the 6th lens L6, and wherein, the lens with negative power in the second lens L2, the 3rd lens L3, the 4th lens L4 and balsaming lens all adopt the material of high index of refraction.
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 optical lens and there is preferably optical property.
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=5.3mm, FNO=1.6, FOV=64 °, TTL=15.6mm.
It should be noted that, the two sides of the first lens L1 is S1, S2, the two sides of the second lens L2 is S3, S4, aperture member L7 face is S5, the two sides of the 3rd lens L3 is S6, S7, and the two sides of the 4th lens L4 is S8, S9, and the two sides of the 5th lens L5 is S10, S11, the two sides of the 6th lens L6 is S11, S12, and the two sides of color filter L8 is S13, S14; Face sequence number one_to_one corresponding in described S1-S14 and following table, wherein, IMA is expressed as the image planes of image planes L9.
Following table is the parameter of the system of the described optical lens of embodiment 1:
According to above-mentioned data, the numerical value calculating formula involved in the present embodiment is as follows:
F1/F=-1.35, F (front)/F=2.08, F (afterwards)/F=1.56, TTL/F=2.96, D/h/FOV=0.014.In embodiment 1, as one group of preferred parameter, adopt the optical lens of this parameter, preferably optical property can be reached.
In sum, a kind of optical lens of the present invention, by adopting 6 lens structures, 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 requirement, and effectively correct the various aberrations of optical system, simultaneously 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.
Embodiment 2: it should be noted that, the difference of the present embodiment and embodiment 1 is, the balsaming lens structure in the rear lens group in the present embodiment is different.
Fig. 5 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 L7, the rear lens group with positive light coke, color filter L8 and imaging surface L9;
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 has negative power and the crescent lens of concave surface facing image space, 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, the 5th lens L5 and the 6th lens L6, described 3rd lens L3 is the biconcave lens with negative power, described 4th lens L4 has positive light coke and the crescent lens of concave surface facing object space, and described 5th lens L5 and the 6th lens L6 forms a balsaming lens.
The 5th lens L5 in described balsaming lens is the biconvex lens with positive light coke, and the 6th lens L6 in described balsaming lens has negative power and the crescent lens of concave surface facing object space.
In the present embodiment, described first lens L1 meets following formula:
Nd(1)≤1.65，Vd(1)≥55，-0.9≥F1/F≥-1.8
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.F1 is the focal length value of the first lens L1, and F represents whole group of focal length value of described optical lens.Lower refractive index can avoid the light of being come by object space after the first lens L1 of negative power light disperse excessive.The relatively whole lens combination of first lens L1 carries out focal power reasonable distribution, and the physical dimension of the first lens L1 and the aberration of optical lens whole system can be made to reach a balance preferably.
In the present embodiment, described second lens L2 meets following formula:
Nd(2)≥1.8，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.
In the present embodiment, the aperture member L7 of described optical lens is between the second lens L2 and the 3rd lens L3, the object done so not only can increase the aperture size of optical lens, the relative exposure performance of improving optical camera lens, and the bore of front lens group can be reduced, be conducive to optical lens miniaturization.
In the present embodiment, described 4th lens L4 has positive light coke and the crescent lens of concave surface facing object space.Wherein, the crescent lens arrangement of concave surface facing object space, can reduce the incident angle of Large visual angle light at the 4th lens L4, effectively reduces the senior aberration of optical lens.Meanwhile, the 4th lens L4 is positive power lens, by the reasonable distribution of focal power, can the aberration of balance optical camera lens, and effectively reduce the effective aperture of balsaming lens group.
In the present embodiment, whole group of focal length value of the focal length value with the lens of positive light coke in described balsaming lens and described optical lens meets following formula:
Dn/dt (just) <-5*10
-6/ DEG C, Vd (just) > 72,1.6>=F (just)/F>=1.2
Wherein, dn/dt (just) refers to the temperature variant variable quantity of the refractive index with the lens of positive light coke in described balsaming lens, Vd (just) refers to the Abbe constant with the material of the lens of positive light coke in described balsaming lens, F (just) refers to the focal length value with the lens of positive light coke in described balsaming lens, and F represents whole group of focal length value of described optical lens.Varied with temperature the reasonable distribution of characteristic by focal power and Refractive Index of Material, when realizing temperature rising, whole group of focal length of optical lens increases, burnt increase after the optics of optical lens; When temperature reduces, whole group of focal length of optical lens reduces, burnt reduction after the optics of optical lens.Thus to offset because structural member expands with heat and contract with cold burnt varying effect after the optics that causes, camera lens is in preferably on imaging surface L9 all the time, meets the resolution energy requirement that camera lens keeps mega pixel in the temperature range of-40 DEG C ~+85 DEG C.
In the present embodiment, 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:
2.7 >=F (front)/F >=1.8,2.0 >=F (afterwards)/F >=1.2
Wherein, F (front) represents 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.
After the optical length of described optical lens and optics, Jiao meets the following conditions:
TTL/F≤3.5，BFL/F≥0.9
Wherein, TTL represents the optical length of described optical lens, 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, BFL is burnt after representing the optics of described optical lens, namely the image side outermost point of the 6th lens L6 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≤0.02
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 curved surface of object space, and h represents the imaging image height corresponding to maximum FOV.
In the present embodiment, described first lens L1 all adopts glass material to the 6th lens L6, and wherein, the lens with negative power in the second lens L2, the 3rd lens L3, the 4th lens L4 and balsaming lens all adopt the material of high index of refraction.
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 preferably optical property.
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=5.3mm, FNO=1.6, FOV=64 °, TTL=15.8mm.
It should be noted that, the two sides of the first lens L1 is S1, S2, the two sides of the second lens L2 is S3, S4, aperture member L7 face is S5, the two sides of the 3rd lens L3 is S6, S7, and the two sides of the 4th lens L4 is S8, S9, and the two sides of the 5th lens L5 is S10, S11, the two sides of the 6th lens L6 is S11, S12, and the two sides of color filter L8 is S13, S14; Face sequence number one_to_one corresponding in described S1-S14 and following table, wherein, IMA is expressed as the image planes of image planes L9.
Following table is the parameter of the system of the described optical lens of embodiment 2:
According to above-mentioned data, the numerical value calculating formula involved in the present embodiment is as follows:
F1/F=-1.43, F (front)/F=2.21, F (afterwards)/F=1.48, TTL/F=2.97, D/h/FOV=0.014.In example 2, as one group of preferred parameter, adopt the optical lens of this parameter, preferably optical property can be reached.
In sum, a kind of optical lens of the present invention, by adopting 6 lens structures, 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 requirement, and effectively correct the various aberrations of optical system, simultaneously 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.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (10)
1. an optical lens, is characterized in that, comprises 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 have negative power and the crescent lens of concave surface facing image space, 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, the 5th lens and the 6th lens, described 3rd lens are the biconcave lens with negative power, described 4th lens are have positive light coke and the crescent lens of concave surface facing object space, and described 5th lens and the 6th lens form a balsaming lens;
Wherein, the lens with positive light coke in described balsaming lens meet condition below:
Vd (just) > 72, and dn/dt (just) <-5*10
-6
Wherein, Vd (just) refers to the Abbe constant with the material of the lens of positive light coke in described balsaming lens, and dn/dt (just) refers to the temperature variant variable quantity of the refractive index with the lens of positive light coke in described balsaming lens.
2. a kind of optical lens according to claim 1, it is characterized in that, the 5th lens in described balsaming lens are have negative power and the crescent lens of concave surface facing image space, and the 6th lens in described balsaming lens are the biconvex lens with positive light coke.
3. a kind of optical lens according to claim 1, it is characterized in that, the 5th lens in described balsaming lens are the biconvex lens with positive light coke, and the 6th lens in described balsaming lens are have negative power and the crescent lens of concave surface facing object space.
4. a kind of optical lens according to claim 1, is characterized in that, whole group of focal length value of the focal length value with the lens of positive light coke in described balsaming lens and described optical lens meets following formula:
1.6 >=F (just)/F >=1.2
Wherein, F (just) refers to the focal length value with the lens of positive light coke in described balsaming lens, and F represents whole group of focal length value of described optical lens.
5. a kind of optical lens according to claim 1, is characterized in that, described first lens meet following formula:
Nd(1)≤1.65，Vd(1)≥55，-0.9≥F1/F≥-1.8
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, and F1 is the focal length value of the first lens, and F is whole group of focal length value of described optical lens.
6. a kind of optical lens according to claim 1, is characterized in that, described second lens meet following formula:
Nd(2)≥1.8，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.
7. a kind of optical lens according to claim 1, 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:
2.7 >=F (front)/F >=1.8,2.0 >=F (afterwards)/F >=1.2
Wherein, F (front) represents 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.
8. a kind of optical lens according to claim 1, is characterized in that, after the optical length of described optical lens and optics, Jiao meets the following conditions:
TTL/F≤3.5，BFL/F≥0.9
Wherein, TTL represents the optical length of described optical lens, 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, BFL is burnt after representing the optics of described optical lens, namely the image side outermost point of the 6th 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.
9. a kind of optical lens according to claim 1, is characterized in that, 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≤0.02
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 curved surface of object space, and h represents the imaging image height corresponding to maximum FOV.
10. a kind of optical lens according to claim 1, it is characterized in that, described first lens all adopt glass material to the 6th lens, and wherein, the lens with negative power in the second lens, the 3rd lens, the 4th lens and balsaming lens all adopt the material of high index of refraction.
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