CN105204140B - A kind of tight shot - Google Patents
A kind of tight shot Download PDFInfo
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- CN105204140B CN105204140B CN201510719494.3A CN201510719494A CN105204140B CN 105204140 B CN105204140 B CN 105204140B CN 201510719494 A CN201510719494 A CN 201510719494A CN 105204140 B CN105204140 B CN 105204140B
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention belongs to lens technology field, more particularly to a kind of high definition ultra-wide angle tight shot, including the first lens being arranged in order from the object side to the image side, the second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens, 4th lens and the 5th lens use plastic cement aspherical lens, and the first lens, the second lens, the 3rd lens and the 6th lens are glass spherical lens；First lens are convex-concave negative-power lenses, second lens are concave-concave negative-power lenses, and the 3rd lens are biconvex positive power lens, and the 4th lens are biconvex positive power lens, 5th lens are concave-concave negative-power lenses, and the 6th lens are biconvex positive power lens.The present invention can realize large aperture by reasonable combination glass lens and plastic lens, image quality is good, and so that infrared can also reach four mega pixels on the premise of not focusing on again, clearly bright monitored picture can be also realized under night low-light (level), there is temperature compensation function simultaneously, Jiao will not also be run by being used in the environment of 30 DEG C~80 DEG C.
Description
Technical field
The invention belongs to lens technology field, more particularly to a kind of tight shot.
Background technology
2.8mm camera lenses are widely used in needing the occasion of big visual field monitoring, and market demand is very big.Traditional 2.8mm
Camera lens is usually full glass lens, because the angle of visual field is very big (usual maximum field of view angle can reach more than 140 °), causes its side
Edge is difficult to be guaranteed as matter.
The 2.8mm of current high definition is generally configured with more than 6 pieces of glass lens, it is seen that light resolution ratio is red more than 2,000,000
Outer resolution ratio is more than 1,000,000.Requirement more and more higher with the development people of technology to definition, 4,000,000,5,000,000 pictures
The chip of element emerges in an endless stream, it is therefore desirable to which a resolution ratio can reach the 2.8mm camera lenses of five mega pixels.If by traditional think of
, typically there are two kinds of methods on road to improve resolution ratio：One is to reduce clear aperature using less eyeglass, and two be using more
Eyeglass.
The performance of camera lens can be no doubt lifted using more eyeglasses, but the thing followed is the increase of cost.Using diminution
Although clear aperature can reduce cost, lens imaging Quality Down can be caused.Full glass lens are used as can be seen here
During design, it is seen that light can not directly obtain balance with infrared light confocal imaging camera lens on Cost And Performance.
And for 2.8mm tight shots, following technical barrier will be solved by still needing：
First, it is seen that light is identical with infrared light focal length.
Monitoring camera is in working condition in day and night, the mainly natural light that the illumination on daytime is used, therefore
The light that daytime, object was sent mainly visible ray, and night then needs to use infrared light floor light, therefore night quilt
Take the photograph the light that thing sends and be mainly infrared light or the mixing light being made up of infrared light and visible ray.And due to visible ray (ripple
Length is by taking 550nm as an example) and refractive index of the infrared light (wavelength is by taking 850nm as an example) in same optical glass, optics plastic cement is not
Equally, this focal position that frequently can lead to visible ray and the focal position of infrared light are different, that is to say, that by camera lens into
Clearly clearly position is different with infrared imaging for position for visual light imaging as after.It is general which results on the market
Logical monitoring camera is difficult the imaging clearly for taking into account day and night.
Second, camera lens need not be re-focused it is ensured that imaging clearly when variation of ambient temperature.
Monitoring camera is widely used in indoor and outdoor, and daily 24 hours 365 days 1 year in running order, residing for camera lens
Variation of ambient temperature is huge.The typical operating temperature requirements of monitoring camera are -30 DEG C~80 DEG C, and camera lens must assure that in this temperature difference
It is imaged in the range of reaching more than 120 degrees Celsius, in the case of without re-focusing still with clear 20 DEG C (normal temperature).
Because the refractive index of eyeglass material can be affected by temperature and change, lens dimension, lens barrel material, microscope base material
It can be expanded with heat and contract with cold with the change of temperature, it is different that these factors cause common monitoring camera to occur under high and low temperature environment
The temperature drift of burnt (rear cut-off distance), referred to as lens imaging after imaging.
In view of this, it is necessory to provide a kind of tight shot, it can by reasonable combination glass lens and plastic lens
Large aperture (F1.8) is realized, image quality is good, it is seen that light resolution ratio can reach five mega pixels, and so that infrared do not weighing
Four mega pixels can be also reached on the premise of new focusing, clearly bright monitoring picture can be also realized under night low-light (level)
Face, while having temperature compensation function, Jiao will not also be run by being used in the environment of -30 DEG C~80 DEG C.
The content of the invention
It is an object of the invention to：In view of the shortcomings of the prior art, a kind of tight shot is provided, it passes through reasonable combination
Glass lens and plastic lens can realize large aperture (F1.8), and image quality is good, it is seen that light resolution ratio can reach 5,000,000
Pixel, and cause it is infrared not again focus on the premise of can also reach four mega pixels, also can under night low-light (level)
Clearly bright monitored picture is realized, while having temperature compensation function, being used in the environment of -30 DEG C~80 DEG C will not also run
It is burnt.
In order to achieve the above object, the present invention is adopted the following technical scheme that：
A kind of tight shot, including be arranged in order from the object side to the image side the first lens, the second lens, the 3rd lens,
Four lens, the 5th lens and the 6th lens, the 4th lens and the 5th lens use plastic cement aspherical lens, described
First lens, second lens, the 3rd lens and the 6th lens are glass spherical lens；
First lens are convex-concave negative-power lenses, and second lens are concave-concave negative-power lenses, described the
Three lens are biconvex positive power lens, and the 4th lens are biconvex positive power lens, and the 5th lens are negative for concave-concave
Power lenses, the 6th lens are biconvex positive power lens；
The ratio of the focal length of 4th lens and the 5th lens and the focal length of whole camera lens meets following condition：
1.55<|f4/f|<1.71；
1.29<|f5/f|<1.49；
Wherein, f is the focal length of whole camera lens；F4 is the focal length of the 4th lens, and f5 is the focal length of the 5th lens.
The cost of plastic lens is far below glass spheric glass, so reduce cost；The 4th again due to the present invention is saturating
Mirror and the 5th lens employ aspherical lens, and performance is improved compared to traditional spheric glass；Importantly, of the invention
In the case where employing plastic cement aspherical lens, it is ensured that the very low temperature drift of camera lens optimum resolution image space.
Relative to prior art, the present invention uses reasonable group of four sheet glass spherical lenses and two panels plastic aspheric lenes
Close and form six chip optical textures, it is possible to achieve large aperture (F1.8), good imaging quality so that visible ray resolution ratio can reach
Five mega pixels, and so that infrared light can reach the resolution ratio of four mega pixels on the premise of not focusing on again, even in night
Also clearly bright monitored picture can be realized under conditions of late low-light (level), and possesses temperature compensation function, at -30 DEG C~80 DEG C
In the environment of using will not also run Jiao, that is to say, that the present invention possesses day and night with burnt function, i.e., visible ray into sharply defined image feelings
Can be to infrared light blur-free imaging without focusing under condition.And cost of the present invention is low, compact conformation, so as in cost and property
Acquirement balance can be gone up, market prospects are extensive.
Improved as one kind of tight shot of the present invention, focal length of first lens to the 6th lens, refractive index
Following condition is met with radius of curvature：
| -7.385≤f1≤-6.412 | 1.55≤n1≤1.8 | 16≤R1≤24 | 3.3≤R2≤4.2 |
| -6.11≤f2≤-5.043 | 1.5≤n2≤1.75 | -15≤R3≤-12.2 | 3.5≤R4≤6.1 |
| 6.081≤f3≤7.252 | 1.7≤n3≤1.9 | 6≤R5≤10.5 | -13.85≤R6≤-9.75 |
| 4.031≤f4≤5.332 | 1.5≤n4≤1.65 | 4≤R7≤6.5 | -5.11≤R8≤-3.05 |
| -4.225≤f5≤-3.551 | 1.5≤n5≤1.65 | -11.28≤R9≤-8.22 | 3.12≤R10≤4.35 |
| 5.362≤f6≤6.503 | 1.5≤n5≤1.7 | 9.14≤R11≤11.92 | -5.92≤R12≤-3.87 |
In upper table, " f " is focal length, and " n " is refractive index, and " R " is radius of curvature, and "-" number represents that direction is negative；
Wherein, f1 to f6 corresponds respectively to the first lens to the focal length of the 6th lens；It is saturating that n1 to n6 corresponds respectively to first
Mirror to the 6th lens refractive index；R1, R3, R5, R7, R9, R11 correspond respectively to the first lens to the close object space of the 6th lens
One side radius of curvature, R2, R4, R6, R8, R10, R12 correspond respectively to the remote object space of the first lens to the 6th lens
Radius of curvature simultaneously.
Improved as one kind of tight shot of the present invention, first lens and second lens are described against assembling
Second lens and the 3rd lens pass through the first spacer ring close-fitting.
Improved as one kind of tight shot of the present invention, the 3rd lens and the 4th lens are tight by the second spacer ring
Match somebody with somebody, the 4th lens and the 5th lens are by the 3rd spacer ring close-fitting, and the 5th lens and the 6th lens pass through
4th spacer ring close-fitting.
Improved as one kind of tight shot of the present invention, light is provided between the 3rd lens and the 4th lens
Door screen.
Improved as one kind of tight shot of the present invention, according to aspherical equation formula：
4th lens meet following relation：
In a word, the present invention has the following advantages compared with prior art：
First, the present invention has accomplished that visible ray is confocal with infrared light, according to lens combination proposed by the invention, material
On the premise of combination, position that camera lens of the invention is imaged to visible ray (400nm~650nm) and infrared light (850nm) into
The position of picture reaches coincidence.
Second, the present invention has temperature compensation function, before according to lens combination proposed by the invention, combination of materials
Put, camera lens of the invention ensure that the optimum resolution image space of -30 DEG C~80 DEG C temperature range inner lenses is constant.
3rd, present invention employs plastic lens, accomplish low cost and high-performance, the 4th lens of the invention and the 5th
Lens employ plastic cement aspherical lens, and the cost of plastic lens is far below glass spheric glass, so reduce cost；And by
Aspherical lens are employed in the 4th lens and the 5th lens of the present invention, performance is improved compared to traditional spheric glass.
In a word, the present invention, which makes full use of, has played that glass lens are easy to process and that the high cost of plastic aspherical element lens performance is low is excellent
Point so that camera lens visible ray resolution ratio can reach five mega pixels, infrared resolution rate can reach four mega pixels, while into
Originally substantially reduce, cost performance is excellent, with very high market value.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
Embodiment
The present invention and its advantage are described in further detail below with reference to specific embodiment, still, this hair
Bright embodiment is not limited thereto.
As shown in figure 1, a kind of high definition ultra-wide angle tight shot that the present invention is provided, including be arranged in order from the object side to the image side
The first lens 1, the second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5 and the 6th lens 6, the 4th lens 4 and
Five lens 5 use plastic cement aspherical lens, and the first lens 1, the second lens 2, the 3rd lens 3 and the 6th lens 6 are glass marble
Face lens；
First lens 1 are convex-concave negative-power lenses, and the second lens 2 are concave-concave negative-power lenses, and the 3rd lens 3 are double
Convex positive power lens, the 4th lens 4 are biconvex positive power lens, and the 5th lens 5 are concave-concave negative-power lenses, and the 6th is saturating
Mirror 6 is biconvex positive power lens；
The ratio of the focal length of 4th lens 4 and the 5th lens 5 and the focal length of whole camera lens meets following condition：
1.55<|f4/f|<1.71；
1.29<|f5/f|<1.49；
Wherein, f is the focal length of whole camera lens；F4 is the focal length of the 4th lens, and f5 is the focal length of the 5th lens.
The cost of plastic lens is far below glass spheric glass, so reduce cost；The 4th again due to the present invention is saturating
The lens 5 of mirror 4 and the 5th employ aspherical lens, and performance is improved compared to traditional spheric glass；Importantly, this hair
It is bright in the case where employing plastic cement aspherical lens, it is ensured that the very low temperature drift of camera lens optimum resolution image space.
In a word, the present invention forms six using the reasonable combination of four sheet glass spherical lenses and two panels plastic aspheric lenes
Formula optical texture, it is possible to achieve large aperture (F1.8), good imaging quality so that visible ray resolution ratio can reach 5,000,000 pictures
Element, and so that infrared light can reach the resolution ratio of four mega pixels on the premise of not focusing on again, even in night low-light (level)
Under conditions of can also realize clearly bright monitored picture, and possess temperature compensation function, in the environment of -30 DEG C~80 DEG C
Using will not also run Jiao, that is to say, that the present invention possesses day and night with burnt function, i.e., need not in the case where visible ray is into sharply defined image
Focusing can be to infrared light blur-free imaging.And cost of the present invention is low, so as to obtain balance, market in cost and performance
Prospect is extensive.
Focal length, refractive index and the radius of curvature of the lens 6 of first lens 1 to the 6th meet following condition：
| -7.385≤f1≤-6.412 | 1.55≤n1≤1.8 | 16≤R1≤24 | 3.3≤R2≤4.2 |
| -6.11≤f2≤-5.043 | 1.5≤n2≤1.75 | -15≤R3≤-12.2 | 3.5≤R4≤6.1 |
| 6.081≤f3≤7.252 | 1.7≤n3≤1.9 | 6≤R5≤10.5 | -13.85≤R6≤-9.75 |
| 4.031≤f4≤5.332 | 1.5≤n4≤1.65 | 4≤R7≤6.5 | -5.11≤R8≤-3.05 |
| -4.225≤f5≤-3.551 | 1.5≤n5≤1.65 | -11.28≤R9≤-8.22 | 3.12≤R10≤4.35 |
| 5.362≤f6≤6.503 | 1.5≤n5≤1.7 | 9.14≤R11≤11.92 | -5.92≤R12≤-3.87 |
In upper table, " f " is focal length, and " n " is refractive index, and " R " is radius of curvature, and "-" number represents that direction is negative；
Wherein, f1 to f6 corresponds respectively to the focal length of the lens 6 of the first lens 1 to the 6th；N1 to n6 corresponds respectively to first
The refractive index of the lens 6 of lens 1 to the 6th；R1, R3, R5, R7, R9, R11 correspond respectively to leaning on for the lens 6 of the first lens 1 to the 6th
The radius of curvature of the one side of nearly object space, R2, R4, R6, R8, R10, R12 correspond respectively to the remote of the lens 6 of the first lens 1 to the 6th
From the radius of curvature of the one side of object space.
First lens 1 and the second lens 2 are against assembling, and the second lens 2 and the 3rd lens 3 pass through the first spacer ring close-fitting.
3rd lens 3 and the 4th lens 4 are by the second spacer ring close-fitting, and the 4th lens 4 and the 5th lens 5 pass through the 3rd spacer ring
Close-fitting, the 5th lens 5 and the 6th lens 6 pass through the 4th spacer ring close-fitting.
Diaphragm 7 is provided between 3rd lens 3 and the 4th lens 4.
According to aspherical equation formula：
4th lens 4 meet following relation：
Embodiment 1
The face type in totally ten two faces, radius of curvature, lens thickness, eyeglass spacing, the eyeglass refraction of the six-element lens of the camera lens
Rate and K values meet following condition respectively：
Table 1：The physical parameter of six-element lens.
| Face sequence number | Face type | R | D | nd | K values |
| 1 | Sphere | 22.356 | 0.6 | 1.65 | |
| 2 | Sphere | 3.512 | 2.39 | ||
| 3 | Sphere | -14.588 | 0.6 | 1.55 | |
| 4 | Sphere | 4.192 | 1.55 | ||
| 5 | Sphere | 6.998 | 3.5 | 1.77 | |
| 6 | Sphere | -13.011 | 2.01 | ||
| Diaphragm | Plane | PL | 1.01 | ||
| 7 | It is aspherical | 4.852 | 2 | 1.5 | 1.5 |
| 8 | It is aspherical | -4.216 | 0.2 | -3.8 | |
| 9 | It is aspherical | -10.011 | 0.45 | 1.6 | -2.2 |
| 10 | It is aspherical | 3.221 | 5.5 | -6.1 | |
| 11 | Sphere | 11.231 | 2.5 | 1.6 | |
| 12 | Sphere | -4.315 |
In upper table, " R " is radius of curvature, and "-" number represents that direction is negative, and " PL " represents plane, and upper table the same face sequence number was both
Have refractive index data n, there is data D, data D to represent the thickness at the lens axial line again, the same face sequence number there was only data D and
There is no refractive index data n, data D to represent the lens to the spacing of next lens face.1-12 is to arrange successively from the object side to the image side
The face sequence number of row.
Wherein with non-spherical structure the 7th, 8,9, the shape on 10 surfaces can state with following equation：
Wherein C=1/R
Table 2：7th, 8,9, the aspherical parameter on 10 surfaces.
| Face sequence number：7 | Face sequence number：8 | Face sequence number：9 | Face sequence number：10 | |
| The parameters of α 1 | -1.201807E-004 | 0.015 | -4.384651E-003 | -3.58021745E-004 |
| The parameters of α 2 | -1.131690E-004 | -2.883452E-004 | -7.314720E-004 | -1.187014E-003 |
| The parameters of α 3 | 2.036421E-005 | 6.891472E-005 | 1.953214E-004 | 1.031472E-004 |
| The parameters of α 4 | -3.328164E-006 | -7.354671E-006 | -1.264723E-005 | 8.713241E-006 |
| The parameters of α 5 | -6.610247E-008 | 1.517432E-007 | 1.697412E-007 | -1.337121E-006 |
| The parameters of α 6 | 0 | 0 | 0 | 0 |
| The parameters of α 7 | 0 | 0 | 0 | 0 |
| The parameters of α 8 | 0 | 0 | 0 | 0 |
The present invention can realize large aperture (F1.8) by reasonable combination glass lens and plastic lens, and image quality is good,
And cause it is infrared can also reach four mega pixels on the premise of not focusing on again, can also be realized under night low-light (level) clear
Clear bright monitored picture, while having temperature compensation function, Jiao will not also be run by being used in the environment of -30 DEG C~80 DEG C.
In a word, the present invention has the following advantages compared with prior art：
First, the present invention has accomplished that visible ray is confocal with infrared light, according to lens combination proposed by the invention, material
On the premise of combination, position that camera lens of the invention is imaged to visible ray (400nm~650nm) and infrared light (850nm) into
The position of picture reaches coincidence.
Second, the present invention has temperature compensation function, before according to lens combination proposed by the invention, combination of materials
Put, camera lens of the invention ensure that the optimum resolution image space of -30 DEG C~80 DEG C temperature range inner lenses is constant.
3rd, present invention employs plastic lens, accomplish low cost and high-performance, the 4th lens 4 of the invention and the
Five lens 5 employ plastic cement aspherical lens, and the cost of plastic lens is far below glass spheric glass, so reduce cost；
Again because the 4th lens 4 and the 5th lens 5 of the present invention employ aspherical lens, improved compared to traditional spheric glass
Performance.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula carries out appropriate change and modification.Therefore, the invention is not limited in embodiment disclosed and described above, to this
Some modifications and changes of invention should also be as falling into the scope of the claims of the present invention.Although in addition, this specification
In used some specific terms, but these terms are merely for convenience of description, do not constitute any limitation to the present invention.
Claims (6)
1. a kind of tight shot, including be arranged in order from the object side to the image side the first lens, the second lens, the 3rd lens, the 4th
Lens, the 5th lens and the 6th lens, it is characterised in that：4th lens and the 5th lens are aspherical using plastic cement
Eyeglass, first lens, second lens, the 3rd lens and the 6th lens are glass spherical lens；
First lens are convex-concave negative-power lenses, and second lens are concave-concave negative-power lenses, and the described 3rd is saturating
Mirror is biconvex positive power lens, and the 4th lens are biconvex positive power lens, and the 5th lens are that concave-concave bears light focus
Lens are spent, the 6th lens are biconvex positive power lens；
The ratio of the focal length of 4th lens and the 5th lens and the focal length of whole camera lens meets following condition：
1.55<|f4/f|<1.71；
1.29<|f5/f|<1.49；
Wherein, f is the focal length of whole camera lens；F4 is the focal length of the 4th lens, and f5 is the focal length of the 5th lens.
2. tight shot according to claim 1, it is characterised in that：First lens to the 6th lens Jiao
Following condition is met away from, refractive index and radius of curvature：
In upper table, " f " is focal length, and " n " is refractive index, and " R " is radius of curvature, and "-" number represents that direction is negative；
Wherein, f1 to f6 corresponds respectively to the first lens to the focal length of the 6th lens；N1 to n6 corresponds respectively to the first lens extremely
The refractive index of 6th lens；R1, R3, R5, R7, R9, R11 correspond respectively to the one of the close object space of the first lens to the 6th lens
The radius of curvature in face, R2, R4, R6, R8, R10, R12 correspond respectively to the first lens to the one side of the remote object space of the 6th lens
Radius of curvature.
3. tight shot according to claim 1, it is characterised in that：First lens and second lens are against dress
Match somebody with somebody, second lens and the 3rd lens pass through the first spacer ring close-fitting.
4. tight shot according to claim 3, it is characterised in that：3rd lens and the 4th lens pass through
Two spacer ring close-fittings, the 4th lens and the 5th lens are by the 3rd spacer ring close-fitting, the 5th lens and the described 6th
Lens pass through the 4th spacer ring close-fitting.
5. tight shot according to claim 1, it is characterised in that：Set between 3rd lens and the 4th lens
It is equipped with diaphragm.
6. tight shot according to claim 1, it is characterised in that：According to aspherical equation formula：
4th lens meet following relation：
Wherein, Z is the non-spherical lens along optical axis direction at the position that height is Y, away from the non-spherical lens summit
Apart from rise, R represents the radius of curvature at the non-spherical lens Mian Xing centers, and K represents circular cone coefficient, and parameter A, B, C, D, E are
High order aspheric surface coefficient.
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| CN201510719494.3A CN105204140B (en) | 2015-10-28 | 2015-10-28 | A kind of tight shot |
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| CN105204140B true CN105204140B (en) | 2017-07-28 |
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