CN107305275B - A kind of optical lens, graph capture device and monitoring system - Google Patents
A kind of optical lens, graph capture device and monitoring system Download PDFInfo
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- CN107305275B CN107305275B CN201610260417.0A CN201610260417A CN107305275B CN 107305275 B CN107305275 B CN 107305275B CN 201610260417 A CN201610260417 A CN 201610260417A CN 107305275 B CN107305275 B CN 107305275B
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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
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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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Abstract
The embodiment of the invention provides a kind of optical lens, image capture device and monitoring systems.The camera lens includes: front lens group, diaphragm, rear lens group and imaging surface, front lens group includes: the first lens and the first lens group with negative power, rear lens group includes: the second lens group and the 7th lens with positive light coke, first and the 7th lens be plastic lens, the first and second lens groups be glass lens group, first and the 7th lens meet following formula: ∣≤0.5 0.2≤∣ F1/F7, Nd1≤1.6, Vd1 >=50, Nd7≤1.6, Vd7 >=50；F1 is the focal length of the first lens, and F7 is the focal length of the 7th lens, and Nd1 is the refractive index of the first lens, and Vd1 is the Abbe number of the first lens, and Nd7 is the refractive index of the 7th lens, and Vd7 is the Abbe number of the 7th lens.As can be seen that the embodiment of the present invention reliably ensure that the resolving power of the optical lens at different ambient temperatures, and then make the optical lens can blur-free imaging under various environment temperatures.
Description
Technical field
The present invention relates to optical image technology fields, more particularly to a kind of optical lens, image capture device and monitoring
System.
Background technique
With the development of science and technology, the utilization of camera becomes increasingly prevalent.For camera, optical lens is it
In an essential element, directly affect the superiority and inferiority of image quality.Existing optical lens is larger there is one
Defect: when the optical lens is under different temperatures environment, when for instance between -30 degrees Celsius to+70 degrees Celsius, light
The variable quantity of (camera lens finally distance of the last face central point of a piece of eyeglass to image planes) burnt after is larger, is especially in high temperature
Or when low temperature environment, rear burnt variable quantity will be big in the extreme, and at this moment the resolving power of camera lens (differentiates the energy of original details shot
Power) it can be substantially reduced, so as to cause the optical lens image blur, it is unable to satisfy the actual demand of user, therefore how to solve temperature
Influence of the degree variation to optical lens resolution is a urgent problem to be solved.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of optical lens, image capture device and monitoring system, with solution
Certainly the variation of environment temperature is easy the problem of impacting to the resolving power of optical lens.
On the one hand, the embodiment of the invention provides a kind of optical lens, it is installed on lens base, along optical axis by object side to picture
The direction of side successively includes: front lens group, diaphragm, rear lens group and imaging surface；Wherein；
The front lens group successively includes: the first lens and the first lens group by the direction of object side to image side along optical axis
Group, the rear lens group successively includes: the second lens group and the 7th lens by the direction of object side to image side along optical axis, described
First lens and first lens group have negative power, and second lens group and the 7th lens have positive light
Focal power, first lens and the 7th lens are plastic lens, first lens group and second lens group
For glass lens group, also, first lens and the 7th lens meet following formula:
0.2 ≤ ∣ F1/F7 ∣≤0.5, Nd1≤1.6, Vd1 >=50, Nd7≤1.6, Vd7 >=50；
Wherein, F1 is the focal length of first lens, and F7 is the focal length of the 7th lens, and Nd1 is first lens
Refractive index, Vd1 be first lens Abbe number, Nd7 be the 7th lens refractive index, Vd7 be the described 7th
The Abbe number of lens.
Further, in above-mentioned optical lens, first lens group includes the first balsaming lens, second lens
Group includes: the second balsaming lens and the 6th lens by the direction of object side to image side along optical axis；Wherein,
First balsaming lens has negative power, and second balsaming lens and the 6th lens have positive light focus
Degree.
Further, in above-mentioned optical lens, first balsaming lens includes: the second lens interconnected and third
Lens, second balsaming lens include: the 4th lens and the 5th lens interconnected；Wherein,
Second lens have negative power, and the third lens have positive light coke, and the 4th lens have just
Focal power, the 5th lens have negative power.
Further, in above-mentioned optical lens, the third lens, the 4th lens and the 5th lens meet with
Lower formula:
Nd3 >=1.75, Vd3≤30, Nd4≤1.7, Vd4 >=60, Nd5 >=1.75, Vd5≤30
Wherein, Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens, and Nd4 is described
The refractive index of 4th lens, Vd4 are the Abbe number of the 4th lens, and Nd5 is the refractive index of the 5th lens, and Vd5 is
The Abbe number of 5th lens.
Further, above-mentioned optical lens meets following formula:
3≤TTL/EFL≤6
Wherein, TTL is the distance between object side and imaging surface of first lens, and EFL is the optical lens
Focal length.
Further, above-mentioned optical lens meets following formula:
BFL/EFL≥1.2
Wherein, BFL is the distance between image side surface and imaging surface of the 7th lens, and EFL is the optical lens
Focal length.
Further, in above-mentioned optical lens, first lens and the 7th lens are plastic aspheric lens.
Further, in above-mentioned optical lens,
The optical lens meets following formula:
-1.5≤f1/f2≤-0.6
Wherein, f1 is the focal length of the front lens group, and f2 is the focal length of the rear lens group；And/or
The F-number FNO of the optical lens meets following formula:
FNO≤2.2。
Another aspect, the embodiment of the invention also provides a kind of graph capture devices, comprising: lens base and above-mentioned optics
Camera lens, wherein the optical lens is installed on the lens base.
Another invention, the embodiment of the invention also provides a kind of monitoring systems, including above-mentioned image capture device.
The embodiment of the invention provides a kind of optical lens, image capture device and monitoring systems.Wherein, the optical frames
Head be installed on lens base, the optical lens along optical axis by the direction of object side to image side successively include: front lens group, diaphragm,
Rear lens group and imaging surface；Wherein, front lens group along optical axis by the direction of object side to image side successively include: the first lens and
First lens group, rear lens group successively include: that the second lens group and the 7th are saturating by the direction of object side to image side along optical axis
Mirror, the first lens and the first lens group have a negative power, and the second lens group and the 7th lens have a positive light coke, and first
Lens and the 7th lens are plastic lens, and the first lens group and the second lens group are glass lens group, also, first is saturating
Mirror and the 7th lens meet following formula: 0.2 ≤ ∣ F1/F7 ∣≤0.5, Nd1≤1.6, Vd1 >=50, Nd7≤1.6, Vd7 >=50；
Wherein, F1 is the focal length of the first lens, and F7 is the focal length of the 7th lens, and Nd1 is the refractive index of the first lens, and Vd1 is first saturating
The Abbe number of mirror, Nd7 are the refractive index of the 7th lens, and Vd7 is the Abbe number of the 7th lens.It can be seen that the present embodiment
Divide by the reasonable selection to lens material each in optical lens and to the first lens and the reasonable of the 7th power of lens
Match, it is ensured that the optical lens at different ambient temperatures, such as temperature be in -30 degrees Celsius to+70 degrees Celsius between when,
The rear burnt variable quantity of the optical lens is smaller, therefore the resolving power of the optical lens at various temperatures is preferable, various
Equal energy blur-free imaging under environment temperature, and then the actual demand of user can be better meet.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of optical lens provided in an embodiment of the present invention；
Fig. 2 is the MTF resolution curve of optical lens provided in an embodiment of the present invention；
Fig. 3 is the spherical aberration curve graph of optical lens provided in an embodiment of the present invention；
Fig. 4 is the field curve figure of optical lens provided in an embodiment of the present invention；
Fig. 5 is the distortion curve of optical lens provided in an embodiment of the present invention；
Fig. 6 is optical lens provided in an embodiment of the present invention when temperature is -30 degrees Celsius, spatial frequency is 120lp/mm
Central vision defocusing curve figure；
Fig. 7 is optical lens provided in an embodiment of the present invention when temperature is+20 degrees Celsius, spatial frequency is 120lp/mm
Central vision defocusing curve figure；
Fig. 8 is optical lens provided in an embodiment of the present invention when temperature is+70 degrees Celsius, spatial frequency is 120lp/mm
Central vision defocusing curve figure；
Fig. 9 is optical lens provided in an embodiment of the present invention under visible light environment, when spatial frequency is 120lp/mm
The defocusing curve figure of central vision；
Figure 10 is optical lens provided in an embodiment of the present invention under infrared luminous environment, when spatial frequency is 120lp/mm
The defocusing curve figure of central vision.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Optical lens embodiment:
Referring to Fig. 1, the structural schematic diagram of optical lens provided in an embodiment of the present invention is shown in figure.The optical lens can
To be installed on lens base.Preferably, can be dismountable connection between the optical lens and lens base, for example, be spirally connected or
Person's clamping.As shown in Figure 1, the optical lens along optical axis by the direction of object side to image side successively include: front lens group, diaphragm 8,
Rear lens group and imaging surface 9.Wherein, front lens group successively includes: the first lens 1 by the direction of object side to image side along optical axis
With the first lens group, rear lens group successively includes: the second lens group and the 7th by the direction of object side to image side along optical axis
Lens 7.Wherein, the image side surface S12 of the object side S11 of the first lens 1 and the first lens 1 all can be concave surface, the 7th lens 7
The image side surface S72 of object side S71 and the 7th lens 7 can be with convex surface.Certainly, the shape of the first lens 1 and the 7th lens 7 is not
It is confined to above situation, can specifically be determined according to the actual situation, the present embodiment does not do any restriction to this.
In the present embodiment, the first lens 1 and the first lens group have negative power, i.e. the first lens 1 and the first lens
Group has disperse function to its incident internal collimated light beam, can reduce entering when light enters the second lens group in this way
Firing angle degree, to reduce peripheral field aberration.Second lens group and the 7th lens 7 have positive light coke, i.e. the second lens group
Its internal collimated light beam has converging action with the 7 pairs of incidences of the 7th lens, can reduce the bore of incident ray, in this way with drop
The bore of low rear lens group.First lens 1 and the 7th lens 7 can be plastic lens, the first lens group and the second lens
Group can be glass lens group, also, the first lens 1 and the 7th lens 7 meet following formula:
0.2 ≤ ∣ F1/F7 ∣≤0.5, Nd1≤1.6, Vd1 >=50, Nd7≤1.6, Vd7 >=50；
Wherein, F1 is the focal length of the first lens 1, and F7 is the focal length of the 7th lens 7, and Nd1 is the refractive index of the first lens 1,
Vd1 is the Abbe number of the first lens 1, and Nd7 is the refractive index of the 7th lens 7, and Vd7 is the Abbe number of the 7th lens 7.
In the present embodiment, the first lens 1 and the 7th lens 7 are plastic lens, the first lens group and the second lens group
For glass lens group, since the order of magnitude of the thermal expansion coefficient of plastics is significantly larger than the order of magnitude of the thermal expansion coefficient of glass,
Therefore, when the temperature of external environment changes, the power variation of the first lens 1 and the 7th lens 7 is significantly larger than first
The power variation of lens group and the second lens group, therefore the rear Jiao Bianhua caused by considering the optical lens because of temperature change
When, it is general only to consider rear Jiao Bianhua caused by the first lens 1 and the 7th lens 7.
For optical lens, under normal temperature state, theoretical imaging position is placed exactly in imaging surface 9
Place.But when significant change occurs for environment temperature, such as optical lens is under high and low temperature environment, due to 1 He of the first lens
The focal power of 7th lens 7, which can generate, to be substantially change, at this point, the theoretical imaging position of the optical lens can be relative to imaging surface 9
It shifts, also, the offset direction and offset distance will receive the influence of temperature and lens design scheme.For example, together
Sample is that under high temperature environment, when camera lens uses a kind of design scheme, theoretical imaging position may be towards the left side of imaging surface 9
(for Fig. 1) offset, and when camera lens is using another design scheme, theoretical imaging position then may be towards imaging surface
9 the right (for Fig. 1) offset.For optical lens provided in an embodiment of the present invention, by the first lens 1
With the reasonable distribution of 7 focal power of the 7th lens, even the absolute value of the focal length ratio of the first lens 1 and the 7th lens 7 be in 0.2
And between 0.5, the refractive index of the first lens 1 and the 7th lens 7 is no more than 1.6, also, the first lens 1 and the 7th lens 7
Abbe number is not less than 50, when environment temperature changes, can just make the light focus of the first lens 1 and the 7th lens 7
Imaging offset caused by degree variation is cancelled out each other with imaging offset caused by lens base deformation.
Principle that above-mentioned offset is cancelled out each other is illustrated with a specific example below.
As shown in Figure 1, when environment temperature apparent increase, lens base will necessarily generate expansion, at this point, due to camera lens base
The bottom end of seat is fixed, and lens base will not be expanded along direction shown in arrow B in Fig. 1, and only can be along arrow C in Fig. 1
Shown in direction expansion, i.e., lens base can be deviated towards direction shown in arrow C, correspondingly, be installed on lens base
Optical lens can also be deviated along direction shown in arrow C therewith, and the theoretical imaging position of the optical lens is towards arrow C at this time
Direction shift；Meanwhile by the reasonable distribution to the first lens 1 and 7 focal power of the 7th lens, at this point, the first lens 1
It shifts with the rear burnt direction that will lead to theoretical imaging position towards arrow B that changes caused by the 7th lens 7.As can be seen that
Caused by the offset direction of imaging position caused by the power variation of first lens 1 and the 7th lens 7 and lens base deformation
The offset direction of imaging position is exactly the opposite, therefore rear coke variation tendency caused by above-mentioned two aspects factor is also exactly the opposite, in this way
Actual imaging position can be made to be positioned as close at imaging surface 9, to guarantee the imaging effect of the optical lens.Environment temperature
The case where when being decreased obviously, is referred to above description, and details are not described herein.
As can be seen that the present embodiment is by the reasonable selection to lens material each in optical lens and to the first lens 1
With the reasonable distribution of the focal power of the 7th lens 7, it is ensured that the optical lens at different ambient temperatures, such as at temperature
When between -30 degrees Celsius to+70 degrees Celsius, the rear burnt variable quantity of the optical lens is smaller, therefore the optical lens is various
At a temperature of resolving power it is preferable, under various environment temperatures can blur-free imaging, and then can better meet user's
Actual demand.
With continued reference to Fig. 1, in above-described embodiment, the first lens group includes the first balsaming lens, the second lens group edge
Optical axis includes: the second balsaming lens and the 6th lens 6 by the direction of object side to image side.Wherein, the first balsaming lens has negative light
Focal power, the second balsaming lens and the 6th lens 6 have positive light coke.When it is implemented, the object side S61 of the 6th lens 6 and
The image side surface S62 of six lens 6 all can be convex surface, certainly, the shape of the 6th lens 6 is not limited to above situation, specifically can be with
It determines according to the actual situation, the present embodiment do not do any restriction to this.
It, can be by gluing due to being respectively provided with a balsaming lens in the first lens group and the second lens group
The material of lens it is reasonably combined, with realize correct the optical lens dispersion purpose, therefore the first lens group and second thoroughly
Lens group group can preferably eliminate the color difference of the optical lens, to improve the imaging performance of the optical lens, thus preferably
Meet the actual demand of user.
In the present embodiment, the first balsaming lens may include: the second lens 2 interconnected and the third lens 3, and second thoroughly
The image side surface S22 of the object side S21 of mirror 2 and the second lens 2 all can be concave surface, the object side S31 and third of the third lens 3 be saturating
The image side surface S32 of mirror 3 all can be convex surface, also, the object side S31 glue of the image side surface S22 of the second lens 2 and the third lens 3
It is combined.
Similarly, the second balsaming lens may include: the 4th lens 4 and the 5th lens 5 interconnected, the 4th lens 4
Object side S41 and the 4th lens 4 image side surface S42 all can be convex surface, the object side S51 and the 5th lens 5 of the 5th lens 5
Image side surface S52 can be concave surface, also, the image side surface S42 of the 4th lens 4 and the object side S51 of the 5th lens 5 are glued at one
It rises.
When it is implemented, the second lens 2 can have negative power, the third lens 3 can have positive light coke, by right
The reasonable distribution of 3 focal power of second lens 2 and the third lens can make first as made of 3 gluing of the second lens 2 and the third lens
Balsaming lens shows negative power.Similarly, the 4th lens 4 can have positive light coke, and the 5th lens 5 can have negative light
Focal power can be made by the reasonable distribution to the 4th lens 4 and 5 focal power of the 5th lens by the 4th lens 4 and 5 glue of the 5th lens
Second balsaming lens made of conjunction shows positive light coke.
In above-described embodiment, the third lens 3, the 4th lens 4 and the 5th lens 5 can satisfy following formula:
Nd3 >=1.75, Vd3≤30, Nd4≤1.7, Vd4 >=60, Nd5 >=1.75, Vd5≤30
Wherein, Nd3 is the refractive index of the third lens 3, and Vd3 is the Abbe number of the third lens 3, and Nd4 is the 4th lens 4
Refractive index, Vd4 are the Abbe number of the 4th lens 4, and Nd5 is the refractive index of the 5th lens 5, and Vd5 is the Abbe system of the 5th lens 5
Number.
As can be seen that the third lens 3 and the 5th lens 5 are high refractive index, high dispersing lens, and the 4th thoroughly in the present embodiment
Mirror 4 is low-refraction, low dispersing lens, in this way, by refractive index to the third lens 3, the 4th lens 4 and the 5th lens 5 and
The reasonable setting of the parameters such as Abbe number, can effectively reduce the dispersion of the optical lens, to make the light of the optical lens
In wider spectral frequency range significant change does not occur for coke after, in this way, the resolving power of the optical lens is wider
Significant change will not occur in spectral frequency range, therefore the image capture device of the optical lens is installed, such as camera is not
Pipe can clearly be imaged on daytime or at night, preferably to meet the actual demand of user.
Preferably, in above-described embodiment, the first lens 1 and the 7th lens 7 all can be plastic aspheric lens.Namely
Say, the radius of curvature of the different location of the first lens 1 and the 7th lens 7 can with its variation with the distance between jackshaft and
Variation, can preferably improve the optical quality of the optical lens, so that the optical lens preferably meets the reality of user in this way
Border demand.
In above-described embodiment, the distance between object side S11 and imaging surface 9 of the first lens 1, i.e. shown in Fig. 1
TTL should be in suitable range.On the one hand, the value of TTL cannot be excessive, can not be real to avoid excessive due to entire length value
The now miniaturization of the optical lens；On the other hand, the value of TTL cannot be too small, so as to can have between the first lens 1 and imaging surface 9
The second lens 2, the third lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6 and the 7th lens are installed in enough spaces
7.When it is implemented, the optical lens can satisfy following formula:
3≤TTL/EFL≤6
Wherein, TTL is the distance between object side S11 and imaging surface 9 of the first lens 1, and EFL is the coke of optical lens
Away from.
As can be seen that when TTL/EFL within the above range when, both can satisfy the small form factor requirements of the optical lens,
It can guarantee have enough spaces that other elements are installed between object side S11 and imaging surface 9 again.
In above-described embodiment, the distance between image side surface S72 and imaging surface 9 of the 7th lens 7, i.e. BFL shown in Fig. 1
Value cannot be too small so that enough spaces can be reserved between the image side surface S72 and imaging surface 9 of the 7th lens 7 come install filter
The auxiliary ones such as color chips.When it is implemented, the optical lens can satisfy following formula:
BFL/EFL≥1.2
Wherein, BFL is the distance between image side surface S72 and imaging surface 9 of the 7th lens 7, and EFL is the coke of optical lens
Away from.
As can be seen that when BFL/EFL within the above range when, which can reserve enough spaces to pacify
Fill auxiliary ones.
In above-described embodiment, which can satisfy following formula:
-1.5≤f1/f2≤-0.6
Wherein, f1 is the focal length of the front lens group, and f2 is the focal length of the rear lens group.
As can be seen that when f1/f2 within the above range when, not only can satisfy the small form factor requirements of the optical lens, but also
It can guarantee have enough spaces that other elements are installed between the image side surface S72 and imaging surface 9 of the 7th lens 7.
In above-described embodiment, the F-number FNO of optical lens can satisfy following formula:
FNO≤2.2。
Since F-number and aperture are inversely proportional, therefore when F-number FNO meets above-mentioned condition, can guarantee in the optical lens
There are enough light-inletting quantities, to preferably ensure that the imaging effect of the optical lens.
To carry out the specific implementation process of optical lens provided in this embodiment with a specific example below detailed
Explanation.
The parameter of each element is as shown in the table in optical lens shown in Fig. 1:
| Face serial number | Radius of curvature r | Center thickness d | Refractive index Nd | Abbe constant Vd | Effective aperture D |
| *S11 | -24.95 | 1 | 1.54 | 56 | 3.27 |
| *S12 | 3.13 | 1.48 | 2.27 | ||
| S21 | -62.60 | 1 | 1.52 | 64 | 2.38 |
| S22 | 3.68 | 0 | 2.17 | ||
| S31 | 3.68 | 1.8 | 1.85 | 24 | 2.17 |
| S32 | -41.12 | 0.5 | 2.01 | ||
| S81 | 0 | 0.1 | 1.98 | ||
| S41 | 6.58 | 2 | 1.50 | 81 | 2.08 |
| S42 | -8.39 | 0 | 2.11 | ||
| S51 | -8.39 | 0.9 | 1.85 | 24 | 2.11 |
| S52 | 8.57 | 0.5 | 2.21 | ||
| S61 | 11.44 | 1.8 | 1.50 | 81 | 2.31 |
| S62 | -6.02 | 0.15 | 2.36 | ||
| *S71 | 9.26 | 2.5 | 1.54 | 56 | 2.27 |
| *S72 | -11.88 | 8.5 | 2.54 | ||
| IMA | Infinity | 3.65 |
Wherein, " * " represents non-spherical lens, aspherical formula are as follows:
In formula: Z be it is aspherical along optical axis direction when being highly the position of h, away from aspheric vertex of surface apart from rise, c=
1/r, r indicate the radius of curvature of mirror surface, and k is circular cone coefficient conic, and A, B, C, D and E are high order aspheric surface coefficient, and in coefficient
E represent scientific notation, as e-05 indicate 10-5。
According to above-mentioned aspherical formula, it is existing to determine that the process apart from rise of non-spherical lens corresponding position belongs to
Technology, in embodiments of the present invention to the process without repeating.
COEFFICIENT K, A, B, C in each non-spherical lens is as shown in the table:
| Face serial number | K | A | B | C |
| S11 | 4.56E+01 | 7.94E-04 | -6.80E-05 | 5.66E-06 |
| S12 | -2.43E-01 | 3.16E-03 | -2.58E-04 | 3.61E-05 |
| S71 | 1.63E+00 | 1.77E-04 | 1.73E-05 | 2.06E-06 |
| S72 | -9.87E+00 | 3.67E-04 | 1.29E-05 | 4.32E-06 |
The optical lens for meeting above-mentioned two surface condition to component parameters is tested for the property, and the available optical lens exists
Rear burnt variation table under different temperatures:
According to upper table it is found that when under normal temperature state, i.e., when environment temperature is+20 degrees Celsius, the optical lens itself
Rear burnt variable quantity caused by the deformation of coke variable quantity and lens base is 0 after due to caused by power variation, therefore the optics
Camera lens at this time being capable of blur-free imaging.Under the low-temperature condition, such as when environment temperature is 0 degree Celsius or -30 degrees Celsius, by
Burnt variable quantity after caused by optical lens deformation of rear coke variable quantity and lens base due to caused by power variation itself
Direction it is exactly the opposite, after the two is cancelled out each other, rear burnt actual change amount is only 0.002mm, and the optical lens also can at this time
It is enough to be imaged relatively clearly.When under the hot environment, such as when environment temperature is+40 degrees Celsius or+70 degrees Celsius, by
The side of burnt variable quantity after caused by optical lens deformation of rear coke variable quantity and lens base due to caused by focal power itself
To exactly the opposite, after the two is cancelled out each other, rear burnt actual change amount is 0 at+40 degrees Celsius, is only at+70 degrees Celsius
0.001mm, the optical lens can also be imaged relatively clearly at this time.
As it can be seen that if each component parameters in the optical lens meet above-mentioned condition, when environment temperature is in -30 degrees Celsius extremely
When between+70 degrees Celsius, the rear burnt variable quantity of the optical lens is within 0.002mm, therefore the optical lens is in the temperature model
Enclose it is interior it is equal can have preferable resolving power, so as to by the imaging effect that ensure that the camera lens.
Referring to fig. 2 to Figure 10, the optical property figure of the optical lens is shown in figure.Wherein, Fig. 2 is the optical lens
MTF resolution curve, horizontal axis are MTF spatial frequencys, and the longitudinal axis is modulating transfer function value.Fig. 3 illustrates different wave length respectively
The spherical aberration curve graph of light, horizontal axis are spherical aberrations, and the longitudinal axis is clear aperture, wherein each curve presses the coordinate with the intersection point of horizontal axis by small
It is arranged to big sequence are as follows: the spherical aberration curve graph for the light that the spherical aberration curve graph for the light that wavelength is 546nm, wavelength are 486nm, wavelength
For the spherical aberration curve graph of the light of 588nm, wavelength be 656nm the spherical aberration curve graph of light, wavelength be 436nm light spherical aberration curve
Figure.Fig. 4 is the field curve figure of the optical lens, and horizontal axis is the curvature of field, and the longitudinal axis is image height.Fig. 5 is that the distortion of the optical lens is bent
Line chart, horizontal axis are distortion percentages, and the longitudinal axis is image height.Fig. 6 is the optical lens temperature is -30 degrees Celsius, spatial frequency is
The defocusing curve figure of central vision when 120lp/mm, horizontal axis are MTF defocus offset amounts, and the longitudinal axis is modulating transfer function value.Fig. 7
It is the optical lens when temperature is+20 degrees Celsius, the defocusing curve for the central vision that spatial frequency is 120lp/mm, horizontal axis is
MTF defocus offset amount, the longitudinal axis are modulating transfer function values.It is+70 degrees Celsius, spatial frequency that Fig. 8, which is the optical lens in temperature,
The defocusing curve of central vision when for 120lp/mm, horizontal axis is MTF defocus offset amount, and the longitudinal axis is modulating transfer function value.Fig. 9
It is the defocusing curve figure of central vision of the optical lens under visible light environment, when spatial frequency is 120lp/mm, horizontal axis is
MTF defocus offset amount, the longitudinal axis are modulating transfer function values.Figure 10 be the optical lens under infrared luminous environment, spatial frequency be
The defocusing curve figure of central vision when 120lp/mm, horizontal axis are MTF defocus offset amounts, and the longitudinal axis is modulating transfer function value.
By Fig. 2 to Fig. 5 it is found that the optical lens has preferable resolving power, various aberrations are played preferably
Calibration result.By Fig. 6 to Fig. 8 it is found that rear burnt change of optical lens within the temperature range of -30 degrees Celsius to+70 degrees Celsius
Change amount is controlled in ± 0.01mm, therefore the optical lens can keep preferable imaging effect under various temperature environments.
By Fig. 9 and Figure 10 it is found that either under visible light or infrared luminous environment, the back focus offset amount of the optical lens is controlled
Within 0.01mm, therefore the optical lens either still can guarantee preferable imaging effect at night on daytime.
To sum up, the optic back focal variable quantity of optical lens provided in this embodiment at different ambient temperatures is all smaller, therefore
The resolving power of the optical lens is preferable, the equal energy blur-free imaging under various environment temperatures, and then can better meet user
Actual demand.
Graph capture device embodiment:
The embodiment of the invention also provides a kind of image capture device, which includes lens base and above-mentioned
Optical lens；The optical lens is installed on lens base.Wherein, the specific implementation process of the optical lens is referring to above description
Can, details are not described herein.
When it is implemented, the image capture device can have for camera or well-known to those skilled in the art other
The concrete type of the equipment of image collecting function, the image capture device can determine according to the actual situation, the present embodiment pair
This does not do any restriction.
Since optical lens has above-mentioned technique effect, therefore the image capture device with the optical lens also has accordingly
Technical effect.
Monitoring system embodiment:
The embodiment of the invention also provides a kind of monitoring system, which includes above-mentioned image capture device.Wherein,
The specific implementation process of the image capture device is referring to above description, and details are not described herein.
Since image capture device has above-mentioned technique effect, therefore the monitoring system with the image capture device also has
Corresponding technical effect.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system reality
For applying example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring to embodiment of the method
Part explanation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of optical lens, is installed on lens base, which is characterized in that successively wrapped along optical axis by the direction of object side to image side
It includes: front lens group, diaphragm (8), rear lens group and imaging surface (9)；Wherein；
The front lens group successively includes: the first lens (1) and the first lens group by the direction of object side to image side along optical axis,
The rear lens group successively includes: the second lens group and the 7th lens (7) by the direction of object side to image side along optical axis, described
First lens (1) and first lens group have negative power, second lens group and the 7th lens (7) tool
There is a positive light coke, first lens (1) and the 7th lens (7) are plastic lens, first lens group and described
Second lens group is glass lens group, also, first lens (1) and the 7th lens (7) meet following formula:
0.2 ≤ ∣ F1/F7 ∣≤0.5, Nd1≤1.6, Vd1 >=50, Nd7≤1.6, Vd7 >=50；
Wherein, F1 is the focal length of first lens (1), and F7 is the focal length of the 7th lens (7), and Nd1 is described first saturating
The refractive index of mirror (1), Vd1 are the Abbe number of first lens (1), and Nd7 is the refractive index of the 7th lens (7), Vd7
For the Abbe number of the 7th lens (7).
2. optical lens as described in claim 1, which is characterized in that first lens group includes the first balsaming lens,
Second lens group includes: the second balsaming lens and the 6th lens (6) by the direction of object side to image side along optical axis；Wherein,
First balsaming lens has negative power, and second balsaming lens and the 6th lens (6) have positive light focus
Degree.
3. optical lens as claimed in claim 2, which is characterized in that first balsaming lens includes: interconnected
Two lens (2) and the third lens (3), second balsaming lens include: the 4th lens (4) interconnected and the 5th lens
(5)；Wherein,
Second lens (2) have negative power, and the third lens (3) have positive light coke, the 4th lens (4) tool
There is positive light coke, the 5th lens (5) have negative power.
4. optical lens as claimed in claim 3, which is characterized in that the third lens (3), the 4th lens (4) and
5th lens (5) meet following formula:
Nd3 >=1.75, Vd3≤30, Nd4≤1.7, Vd4 >=60, Nd5 >=1.75, Vd5≤30
Wherein, Nd3 is the refractive index of the third lens (3), and Vd3 is the Abbe number of the third lens (3), and Nd4 is institute
The refractive index of the 4th lens (4) is stated, Vd4 is the Abbe number of the 4th lens (4), and Nd5 is the folding of the 5th lens (5)
Rate is penetrated, Vd5 is the Abbe number of the 5th lens (5).
5. optical lens as described in claim 1, which is characterized in that the optical lens meets following formula:
3≤TTL/EFL≤6
Wherein, TTL is the distance between object side (S11) and imaging surface (9) of first lens (1), and EFL is the optics
The focal length of camera lens.
6. optical lens as described in claim 1, which is characterized in that the optical lens meets following formula:
BFL/EFL≥1.2
Wherein, BFL is the distance between image side surface (S72) and imaging surface (9) of the 7th lens (7), and EFL is the optics
The focal length of camera lens.
7. optical lens as described in claim 1, which is characterized in that first lens (1) and the 7th lens (7) are
Plastic aspheric lens.
8. optical lens as described in claim 1, which is characterized in that
The optical lens meets following formula:
-1.5≤f1/f2≤-0.6
Wherein, f1 is the focal length of the front lens group, and f2 is the focal length of the rear lens group；And/or
The F-number FNO of the optical lens meets following formula:
FNO≤2.2。
9. a kind of image capture device characterized by comprising lens base and as of any of claims 1-8
Optical lens, wherein the optical lens is installed on the lens base.
10. a kind of monitoring system, which is characterized in that including image capture device as claimed in claim 9.
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| CN109001887B (en) * | 2017-06-07 | 2021-07-30 | 宁波舜宇车载光学技术有限公司 | Optical lens |
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| CN109975950B (en) * | 2017-12-27 | 2021-06-04 | 宁波舜宇车载光学技术有限公司 | Optical lens |
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| CN113376812B (en) * | 2017-12-29 | 2022-10-04 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| TWI644142B (en) * | 2018-01-25 | 2018-12-11 | 大立光電股份有限公司 | Imaging optical lens assembly, imaging apparatus and electronic device |
| CN108318996B (en) * | 2018-03-09 | 2024-02-20 | 江西联益光学有限公司 | Collimation lens |
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| CN110488470B (en) * | 2018-05-14 | 2021-10-26 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN108873270B (en) * | 2018-07-13 | 2024-04-12 | 舜宇光学(中山)有限公司 | Glass-plastic mixed prime lens |
| CN109100856B (en) * | 2018-10-19 | 2023-10-03 | 广东奥普特科技股份有限公司 | High-resolution large-target-surface-magnification-adjustable line-scanning machine vision lens |
| CN109254386B (en) * | 2018-11-22 | 2024-04-19 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
| CN109889722B (en) * | 2019-01-04 | 2021-01-26 | 信利光电股份有限公司 | High-low temperature shooting method and device of camera and camera |
| CN111435191B (en) * | 2019-01-14 | 2022-10-14 | 杭州海康威视数字技术股份有限公司 | Zoom lens, camera and monitoring equipment |
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