CN109358412A - A kind of confocal camera lens of high definition - Google Patents
A kind of confocal camera lens of high definition Download PDFInfo
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- CN109358412A CN109358412A CN201811542807.2A CN201811542807A CN109358412A CN 109358412 A CN109358412 A CN 109358412A CN 201811542807 A CN201811542807 A CN 201811542807A CN 109358412 A CN109358412 A CN 109358412A
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- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 239000011521 glass Substances 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 3
- 238000009738 saturating Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 abstract description 3
- 238000003384 imaging method Methods 0.000 description 10
- 238000005286 illumination Methods 0.000 description 9
- 230000004075 alteration Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004438 eyesight Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000004304 visual acuity Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000002834 transmittance 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
- G02B13/0015—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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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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 invention discloses a kind of confocal camera lenses of high definition, are successively arranged from object side to image side: the first lens；Second lens；Diaphragm；The third lens；4th lens；5th lens；Optical filter；Protect glass；Sensitive chip.The concave, convex composite structure that each lens of the present invention use, by selecting the material of appropriate index and reasonably distributing focal power, can it is visible with realize fine definition simultaneously under infrared mode.The present invention selects the structure of three pieces glass spheric glass and two panels plastic cement aspherical lens, by rationally controlling each lens thickness and airspace distance, makes to compensate mutually between each eyeglass, drift about under realization high/low temperature condition very small.
Description
[technical field]
The present invention relates to optical lens technology fields, more particularly to a kind of confocal camera lens of high definition.
[background technique]
Infrared confocal camera lens can day and night share same optical system imaging, no replacement is required optical device, be vehicle-mounted at present, peace
The development trend of lens technology specification and future market that anti-industry proposes.However existing it is mostly used in vehicle-mounted, security protection
Infrared confocal camera lens, generally existing clarity is not high enough, and infrared visible defocusing amount is big, is difficult to realize night even on daytime simultaneously
Clarity requirement, clarity degradation under high and low temperature environment, temperature drift is big, is not able to satisfy many vehicle-mounted, security protection occasions
Requirement for camera lens shape, the periphery brightness of lens imaging picture is inadequate, and relative illumination is low.
Therefore, the present invention is based on above deficiency and generates.
[summary of the invention]
The technical problem to be solved by the present invention is at present infrared confocal lens articulation is low, defocusing amount is big, temperature drift is big,
The low problem of relative illumination provides a kind of confocal camera lens of high definition.
In order to solve the above technical problems, present invention employs following technical proposals:
A kind of confocal camera lens of high definition, it is characterised in that it is successively arranged from object side to image side:
First lens, the first lens towards object side and towards image side while be concave surface；First lens
Focal length be negative；
Second lens, the second lens towards object side and towards image side while be convex surface；Second lens
Focal length be positive；
Diaphragm；
The third lens, the one side of the third lens towards object side are concave surface, and the one side towards image side is convex surface；The third is saturating
The focal length of mirror is positive；
4th lens, the 4th lens towards object side and towards image side while be convex surface；4th lens
Focal length be positive；
5th lens, the one side of the 5th lens towards object side are concave surface, and the one side towards image side is convex surface；Described 5th thoroughly
The focal length of mirror is negative；
Optical filter；
Protect glass；
Sensitive chip.
A kind of confocal camera lens of high definition as described above, it is characterised in that the confocal camera lens of high definition meets following
Relational expression:
- 1.5 < f1/ f < -0.5；
0.5 < f2/ f < 1.5；
5 < f3/ f < 15；
2 < f4-5/ f < 6；
3 < TTL/f < 6；
Wherein, f is the focal length of camera lens, f1For the focal length of the first lens, f2For the focal length of the second lens, f3For the third lens
Focal length, f4-5For the combined focal length of the 4th lens and the 5th lens, TTL is the overall length of infrared confocal camera lens.
A kind of confocal camera lens of high definition as described above, it is characterised in that the confocal camera lens of high definition meets following
Relational expression:
Nd1≤1.7；
Nd2≥1.6；
Nd3≥1.6；
|Nd2- Nd3|≤0.3；
|Nd4- Nd5|≥0.1；
Wherein, Nd1For the refractive index of the first lens, Nd2For the refractive index of the second lens, Nd3For the refraction of the third lens
Rate, Nd4For the refractive index of the 4th lens, Nd5For the refractive index of the 5th lens.
A kind of confocal camera lens of high definition as described above, it is characterised in that first lens, the second lens, third
Lens are glass spherical lens, and the 4th lens, the 5th lens are plastic aspheric lenes.
A kind of confocal camera lens of high definition as described above, it is characterised in that the confocal camera lens of high definition meets following
Relational expression:
lens1> 50, lens2< 50, lens3< 50；
|lens4- lens5|≥25；
1≤lens1/lens2≤2；
Wherein, lens1For the abbe number of the first lens, lens2For the abbe number of the second lens, lens3It is saturating for third
The abbe number of mirror, lens4For the abbe number of the 4th lens, lens5For the abbe number of the 5th lens.
A kind of confocal camera lens of high definition as described above, it is characterised in that the confocal camera lens of high definition meets following
Relational expression:
(A12+A23+A34)/TTL < 0.2；
0.4 < (T1+T2+T3+T4+T5)/TTL < 0.7；
0.1 < BF/TTL < 0.5；
Wherein, A12Airspace distance between the first lens and the second lens, A23For the second lens and the third lens
Between airspace distance, A34For the airspace distance between the third lens and the 4th lens, BF is the 5th lens and sense
Airspace distance between optical chip, T1For the center thickness of the first lens, T2For the center thickness of the second lens, T3It is
The center thickness of three lens, T4For the center thickness of the 4th lens, T5For the center thickness of the 5th lens, TTL is the total of camera lens
It is long.
Compared with prior art, the confocal camera lens of a kind of high definition of the invention achieving the following effects:
1, the concave, convex composite structure that each lens of the invention use, by the material and reasonably for selecting appropriate index
Focal power is distributed, can realize fine definition simultaneously under visible and infrared mode.
2, the structure of the present invention selection three pieces glass spheric glass and two panels plastic cement aspherical lens, it is each by rationally controlling
Lens thickness and airspace distance make to compensate mutually between each eyeglass, drift about under realization high/low temperature condition very small.
3, the present invention realizes high relative illumination, reaches by being not provided with vignetting in control eyeglass face type and optimization process
88%, far beyond general illumination level 40%.
4, the present invention has clarity height, and the feature that infrared defocusing amount is small, temperature drift is small, illumination is high is suitble to promote and apply.
[Detailed description of the invention]
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the MTF curve of visible mode under room temperature in the embodiment of the present invention；
Fig. 3 is the MTF curve of infrared mode under room temperature in the embodiment of the present invention；
Fig. 4 is the overfocus curve graph of visible waveband under room temperature in the embodiment of the present invention；
Fig. 5 is the overfocus curve graph of infrared band under room temperature in the embodiment of the present invention；
Fig. 6 is the overfocus curve graph of -40 DEG C of visible wavebands of low temperature in the embodiment of the present invention；
Fig. 7 is the overfocus curve graph of+85 DEG C of visible wavebands of high temperature of the embodiment of the present invention；
Fig. 8 is the relative illumination curve in the embodiment of the present invention.
[specific embodiment]
It elaborates with reference to the accompanying drawing to embodiments of the present invention.
As shown in Figure 1, a kind of confocal camera lens of high definition, is successively arranged from object side to image side:
First lens 1, object side and image side surface are concave surface；The focal length of first lens 1 is negative；
Second lens 2, object side and image side surface are convex surface；The focal length of second lens 2 is positive；
Diaphragm 3；
The third lens 4, object side are concave surface, and image side surface is convex surface；The focal length of the third lens 4 is positive；
4th lens 5, object side and image side surface are convex surface；The focal length of 4th lens 5 is positive；
5th lens 6, object side are concave surface, and image side surface is convex surface；5th lens, 6 focal length is negative；
Optical filter 7；Optical filter is set, to improve imaging effect；
Protect glass 8；To protect sensitive chip 9, prevent outer bound pair sensitive chip from damaging；
Sensitive chip 9.
Each lens are using the combination of concave, convex face type and positive and minus focal composite structure in the present invention, by reasonably distributing light
Focal power can preferably reduce infrared visible defocusing amount, thus realize it is infrared confocal, while realize reduce temperature drift amount, protect
The clarity that card camera lens is imaged in high and low temperature environment is unaffected, in addition, eyeglass is finally set as convex surface on one side, is conducive to
Increase the ratio for being incident on outer visual field light cone solid angle and central vision light cone solid angle when practising physiognomy, reduces outer field rays energy
With the difference of central vision light ray energy, relative illumination is improved.
As shown in Figure 1, in the present embodiment, the confocal camera lens of high definition meets following relationship:
- 1.5 < f1/ f < -0.5；
0.5 < f2/ f < 1.5；
5 < f3/ f < 15；
2 < f4-5/ f < 6；
3 < TTL/f < 6；
Wherein, f is the focal length of camera lens, f1For the focal length of the first lens 1, f2For the focal length of the second lens 2, f3It is saturating for third
The focal length of mirror 4, f4-5For the combined focal length of the 4th lens 5 and the 5th lens 6, TTL is the overall length of infrared confocal camera lens.
In the present embodiment, meet the lens combination structure of above-mentioned each focal length of lens relationship, can reasonable distribution it is each
The focal power of mirror improves imaging definition, and fine definition is realized under visible and infrared both of which, reduces under both of which most
The offset of good image planes achievees the purpose that confocal.
As shown in Figure 1, in the present embodiment, the confocal camera lens of high definition meets following relationship:
Nd1≤1.7；
Nd2≥1.6；
Nd3≥1.6；
|Nd2- Nd3|≤0.3；
|Nd4- Nd5|≥0.1；
Wherein, Nd1For the refractive index of the first lens 1, Nd2For the refractive index of the second lens 2, Nd3For the folding of the third lens 4
Penetrate rate, Nd4For the refractive index of the 4th lens 5, Nd5For the refractive index of the 5th lens 6.
In the present embodiment, meet the lens combination structure of above-mentioned index of refraction relationship, can relatively easily realize light focus
Reasonable distribution, the aberrations such as preferable spherical aberration corrector, the curvature of field, coma are spent, so that visible and infrared band imaging definition is improved, it is full
The infrared confocal requirement of foot.
As shown in Figure 1, in the present embodiment, first lens 1, the second lens 2, the third lens 4 are glass marble
Face lens, the 4th lens 5, the 5th lens 6 are plastic aspheric lenes.
In the present embodiment, using two panels aspherical mirror and the fit system of 3 spherical mirrors, by optimizing lens curvature
With face type, the aberrations such as energy preferable spherical aberration corrector, the curvature of field, astigmatism can improve lens imaging resolution ratio, realize fine definition.It adopts
With the spherical mirror of glass material, thermal refractive index coefficient is small, and thermal expansion coefficient is small under high/low temperature, can easily realize temperature drift amount
Small requirement, in addition, optical transmittance is high using the spherical lens of glass material, and hardness is higher than common plastic lens, more suitable
It closes eyeglass and needs exposed environment, be able to satisfy vehicle-mounted industry to the high request of camera lens patience.
As shown in Figure 1, in the present embodiment, the confocal camera lens of the high definition, which is characterized in that the high definition
Confocal camera lens meets following relationship:
lens1> 50, lens2< 50, lens3< 50；
|lens4- lens5|≥25；
1≤lens1/lens2≤2；
Wherein, lens1For the abbe number of the first lens 1, lens2For the abbe number of the second lens 2, lens3For third
The abbe number of lens 4, lens4For the abbe number of the 4th lens 5, lens5For the abbe number of the 5th lens 6.
In the present embodiment, the lens combination structure for meeting above-mentioned each lens achromatic Relationship of Coefficients may be implemented preferably
Chromatic aberration correction ability realize infrared confocal requirement to improve visible with infrared band imaging definition.
As shown in Figure 1, in the present embodiment, the confocal camera lens of high definition meets following relationship:
(A12+A23+A34)/TTL < 0.2；
0.4 < (T1+T2+T3+T4+T5)/TTL < 0.7；
0.1 < BF/TTL < 0.5；
Wherein, A12For the airspace distance between the first lens 1 and the second lens 2, A23For the second lens 2 and third
Airspace distance between lens 4, A34For the airspace distance between the third lens 4 and the 4th lens 5, BF is the 5th saturating
Airspace distance between mirror 6 and sensitive chip 9, T1For the center thickness of the first lens 1, T2It is thick for the center of the second lens 2
Degree, T3For the center thickness of the third lens 4, T4For the center thickness of the 4th lens 5, T5For the center thickness of the 5th lens 6, TTL
For the overall length of camera lens.
In the present embodiment, the lens combination structure for meeting above-mentioned size relationship, in the premise for guaranteeing lens optical performance
Under, by rationally controlling lens thickness and interval, the lens materials that simultaneous selection appropriate index varies with temperature make each lens
Focal power high/low temperature change when compensate mutually, realize lesser temperature drift amount, at different temperatures can steady operation, clearly
Imaging.
In the present embodiment, the focal length f=3.494mm of the confocal camera lens of high definition, relative aperture FNO=2.5, field angle
FOV=94 °, camera lens overall length be TTL=15.418mm, visible waveband used be 435~656nm, infrared band be 900~
980nm, each lens items design parameter are as shown in the table:
| Face number | Radius R | Thickness | Refractive index Nd | Abbe number Vd |
| Object side | Infinity | 500 | ||
| S1 | -15.544 | 0.6 | 1.583 | 59.416 |
| S2 | 2.497 | 2.06 | ||
| S3 | 5.841 | 2 | 1.774 | 49.604 |
| S4 | -4.768 | -0.104 | ||
| Diaphragm | Infinity | 0.384 | ||
| S6 | -3.763 | 2.502 | 1.883 | 40.807 |
| S7 | -4.503 | 0.1 | ||
| *S8 | 11.240 | 1.573 | 1.535 | 56.072 |
| *S9 | -2.483 | 1.201 | 1.661 | 20.373 |
| *S10 | -10.015 | 0.5 | ||
| S11 (optical filter) | Infinity | 0.3 | 1.517 | 64.212 |
| S12 (optical filter) | Infinity | 3.802 | ||
| S13 (protection glass) | Infinity | 0.40 | 1.517 | 64.212 |
| S14 (protection glass) | Infinity | 0.1 | ||
| Image side | Infinity | - |
In upper table, the unit of radius R and thickness is millimeter；Marking the face of " * " indicates aspherical, aspherical lens
Face type meet following relationship:
In formula, parameter c is curvature corresponding to lens radius, and y is radial coordinate, the unit and length of lens of radial coordinate
Unit is identical, and k is circular cone whose conic coefficient；When k-factor is less than -1, the face shape curve of lens is hyperbola, when k-factor etc.
When -1, the face shape curve of lens is parabola；When k-factor is between -1 to 0, the face shape curve of lens is ellipse, works as k
When coefficient is equal to 0, the face shape curve of lens is circle, and when k-factor is greater than 0, the face shape curve of lens is oblateness；a1To a8
Coefficient corresponding to each radial coordinate is respectively indicated, detailed aspherical relevant parameter is as shown in the table:
| k | a1 | a2 | a3 | a4 | |
| *S8 | -74.64784 | 0 | 0.0049444102 | -0.00095320341 | -0.00015792315 |
| *S9 | -0.1621267 | 0 | 0.0078060901 | -0.0042213306 | 0.0012596561 |
| *S10 | -38.63106 | 0 | -0.0030140012 | 0.00010313957 | 8.376606e-005 |
Continued:
| a5 | a6 | a7 | a8 | |
| *S8 | 6.3871644e-005 | 4.742665e-006 | -9.1702474e-007 | -4.9577249e-007 |
| *S9 | 0.00038339585 | -0.00021940575 | 7.6693848e-006 | 4.813244e-006 |
| *S10 | -2.1886897e-005 | 4.2220406e-007 | 2.3082344e-007 | -2.7982633e-009 |
The optical property of the present embodiment is as shown in Figures 2 to 7, and wherein Fig. 2, Fig. 3 are that the high definition in this programme is confocal
The MTF curve of camera lens at normal temperature, for evaluating optical system resolving power, Fig. 2 is the design result of visible mode, and Fig. 3 is
The design result of infrared mode, under both of which, the mtf value of had visual field can be easier to full 0.55 or more at 83lp/mm
The high definition demand of foot 2,000,000；Fig. 4 to Fig. 7 is the overfocus curve graph of the confocal camera lens of high definition in this programme, for evaluating
The resolving power situation of change of different location before and after optimum image plane position of optical system, Fig. 4 curve indicate visible under room temperature
The design result of wave band, Fig. 5 curve indicate the design result of infrared band under room temperature, comparison diagram 4 and Fig. 5 curve, the two peak value
Corresponding abscissa offset is only 5um, and central vision mtf value is all larger than 0.65 at same image planes, is illustrated infrared visible confocal
Degree is preferable, and defocusing amount is very small, is switched to infrared optical mode from visible mode, without re-starting focusing, can be obtained
Extraordinary image quality；Fig. 6 is the overfocus curve graph of -40 DEG C of visible wavebands of low temperature, and Fig. 7 is+85 DEG C of visible wavebands of high temperature
Overfocus curve graph, comparison diagram 4, Fig. 6 and Fig. 7, it can be seen that under high/low temperature condition, back focus offset amount is very small, with room temperature
It compares, low temperature shift amount is only -4um, high temperature drift amount only+3um, at this point, mtf value variable quantity is less than 3%, it is hardly right
Imaging effect impacts, therefore under high and low temperature environment, is still able to maintain extraordinary imaging effect；Fig. 8 is this programme
Relative illumination curve, for evaluating the uniformity of image planes luminous intensity, it can be seen from the figure that the high definition in this programme is confocal
The relative illumination of camera lens is very high, reaches 88%, and with respect to the luminance difference very little at center, overall brightness is uniform on image planes periphery.
Claims (6)
1. a kind of confocal camera lens of high definition, it is characterised in that it is successively arranged from object side to image side:
First lens (1), the first lens (1) towards object side and towards image side while be concave surface；Described first thoroughly
The focal length of mirror (1) is negative；
Second lens (2), the second lens (2) towards object side and towards image side while be convex surface；Described second thoroughly
The focal length of mirror (2) is positive；
Diaphragm (3)；
The third lens (4), the one side of the third lens (4) towards object side are concave surface, and the one side towards image side is convex surface；The third
The focal length of lens (4) is positive；
4th lens (5), the 4th lens (5) towards object side and towards image side while be convex surface；Described 4th thoroughly
The focal length of mirror (5) is positive；
5th lens (6), the one side of the 5th lens (6) towards object side are concave surface, and the one side towards image side is convex surface；Described 5th
The focal length of lens (6) is negative；
Optical filter (7)；
It protects glass (8)；
Sensitive chip (9).
2. the confocal camera lens of a kind of high definition according to claim 1, it is characterised in that the confocal camera lens of high definition
Meet following relationship:
- 1.5 < f1/ f < -0.5；
0.5 < f2/ f < 1.5；
5 < f3/ f < 15；
2 < f4-5/ f < 6；
3 < TTL/f < 6；
Wherein, f is the focal length of camera lens, f1For the focal length of the first lens (1), f2For the focal length of the second lens (2), f3It is saturating for third
The focal length of mirror (4), f4-5For the combined focal length of the 4th lens (5) and the 5th lens (6), TTL is the overall length of infrared confocal camera lens.
3. the confocal camera lens of a kind of high definition according to claim 1, it is characterised in that the confocal camera lens of high definition
Meet following relationship:
Nd1≤1.7；
Nd2≥1.6；
Nd3≥1.6；
|Nd2- Nd3|≤0.3；
|Nd4- Nd5|≥0.1；
Wherein, Nd1For the refractive index of the first lens (1), Nd2For the refractive index of the second lens (2), Nd3For the third lens (4)
Refractive index, Nd4For the refractive index of the 4th lens (5), Nd5For the refractive index of the 5th lens (6).
4. the confocal camera lens of a kind of high definition according to claim 1, it is characterised in that first lens (1),
Two lens (2), the third lens (4) are glass spherical lens, and the 4th lens (5), the 5th lens (6) are that plastic cement is aspherical
Mirror.
5. the confocal camera lens of a kind of high definition according to claim 1, it is characterised in that the confocal camera lens of high definition
Meet following relationship:
lens1> 50, lens2< 50, lens3< 50；
|lens4- lens5|≥25；
1≤lens1/lens2≤2；
Wherein, lens1For the abbe number of the first lens (1), lens2For the abbe number of the second lens (2), lens3For third
The abbe number of lens (4), lens4For the abbe number of the 4th lens (5), lens5For the abbe number of the 5th lens (6).
6. the confocal camera lens of a kind of high definition according to claim 1, it is characterised in that the confocal camera lens of high definition
Meet following relationship:
(A12+A23+A34)/TTL < 0.2；
0.4 < (T1+T2+T3+T4+T5)/TTL < 0.7；
0.1 < BF/TTL < 0.5；
Wherein, A12For the airspace distance between the first lens (1) and the second lens (2), A23For the second lens (2) and third
Airspace distance between lens (4), A34For the airspace distance between the third lens (4) and the 4th lens (5), BF is
Airspace distance between 5th lens (6) and sensitive chip (9), T1For the center thickness of the first lens (1), T2It is second
The center thickness of lens (2), T3For the center thickness of the third lens (4), T4For the center thickness of the 4th lens (5), T5It is the 5th
The center thickness of lens (6), TTL are the overall length of camera lens.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111538138A (en) * | 2020-07-09 | 2020-08-14 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
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