CN108681052A - High-resolution, big image planes, small size, infrared confocal varifocal optical system - Google Patents
High-resolution, big image planes, small size, infrared confocal varifocal optical system Download PDFInfo
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- CN108681052A CN108681052A CN201810477354.3A CN201810477354A CN108681052A CN 108681052 A CN108681052 A CN 108681052A CN 201810477354 A CN201810477354 A CN 201810477354A CN 108681052 A CN108681052 A CN 108681052A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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Abstract
The present invention relates to optical lens technical fields to be equipped with more particularly to a kind of high-resolution, big image planes, small size, infrared confocal varifocal optical system from object side to image side successively：Focal length is positive the first lens group, focal length is minus second lens group, iris diaphgram, focal length are positive the third lens group, focal length is positive the 4th lens group and sensitive chip；First lens group, iris diaphgram and the third lens faciation fix sensitive chip, second lens group and the 4th lens group can be moved forward and backward with respect to sensitive chip, optical system is from short focus into long-focus change procedure, second lens group is gradually moved to the third lens group, and the effect of focusing is realized when the 4th lens group is moved relative to sensitive chip；The third lens group includes three pieces of lens, and one piece of non-spherical lens that one piece of non-spherical lens being provided with and the second lens group are equipped with can carry out the correction of aberration；One piece of non-spherical lens that 4th lens group is equipped with can carry out the correction of the curvature of field.
Description
Technical field
The present invention relates to optical lens technical field, more particularly to a kind of high-resolution, big image planes, small size, infrared
Confocal varifocal optical system.
Background technology
Zoom lens is widely applied in daily life at present, and Vehicles Collected from Market is toward the side of high-resolution and high image quality
To development, in order to obtain better image quality, using pixel bigger, the more chips of pixel be solve the problems, such as it is basic
One of approach, but current safety monitoring, monitoring road conditions device have the disadvantage that：
Common zoom lens can not often accomplish that big image planes are compatible with volume, and image planes increase can cause camera lens volume simultaneously
Change dramatically, the monitoring camera of big picture currently on the market, such as 1 " camera lens of left and right, image planes size reaches 16.0mm,
Its volume is bigger, and is mostly tight shot, is difficult to control when monitoring distance and changing；
The monitoring camera resolution ratio of the high image quality on the market of mainstream is relatively low at present, mostly 1080p, pixel number 2,000,000
, however as the promotion of data transmission bauds, the picture transmission of higher image quality is possibly realized, and 2,000,000 pixels cannot expire
Sufficient demand；The camera lens image planes of the 1080P of mainstream are mainly 1/2.8 at present ", use the 1/ of effective imaging face diagonal 6.2mm
2.8 " chip of CMOS, pixel size only have 2.8 μm, and resolution ratio is not very high；And due to pixel very little, sense
The performances such as photosensitiveness and color rendition are all less desirable, are badly in need of performance improvement；
Monitoring camera currently on the market, mostly non-infrared confocal camera lens, therefore the more occasion of optical wavelength section such as
When at dusk, or at night having part lighting, the picture of shooting can not be integrally clear, always has obscure portions；
Invention content
Based on this, it is necessary in view of the above technical problems, a kind of varifocal optical system is provided, to reach high-resolution, big
Image planes, small size, infrared confocal effect.
A kind of high-resolution, big image planes, small size, infrared confocal varifocal optical system, set successively from object side to image side
Have：
Focal length is positive the first lens group, focal length is minus second lens group, iris diaphgram, focal length are positive the third lens
Group, focal length are positive the 4th lens group and sensitive chip；
First lens group, iris diaphgram and the third lens faciation fix sensitive chip, the second lens group and the 4th lens
Group can be moved forward and backward with respect to sensitive chip；Optical system from short focus into long-focus change procedure, the second lens group gradually to
The third lens group moves, and the effect of focusing is realized when the 4th lens group is moved relative to sensitive chip；
Second lens group is equipped with one piece of non-spherical lens；The third lens group includes three pieces of lens, is provided with one piece of aspheric
Face lens；4th lens group is equipped with one piece of non-spherical lens.
In one of the embodiments, the third lens group from object side to image side successively be equipped with focal length be the 7th positive lens,
Focal length is that positive the 8th lens and focal length are negative the 9th lens；7th lens are non-spherical lens.
In one of the embodiments, the 4th lens group from object side to image side successively be equipped with focal length be the tenth positive lens,
Focal length is that negative the 11st lens and focal length are positive the 12nd lens；Tenth lens and the 11st lens are balsaming lens, the
12 lens are non-spherical lens.
The image side surface of the 12nd lens is convex surface in one of the embodiments,.
The non-spherical lens is glass aspheric lenses in one of the embodiments,.
In one of the embodiments, the second lens group from object side to image side successively be equipped with focal length be bear the 4th lens,
Focal length is that negative the 5th lens and focal length are positive the 6th lens；The refractive index of 4th lens is greater than or equal to 1.6, and Abbe number is small
In or equal to 50.
It is negative first saturating that the first lens group is equipped with focal length from object side to image side surface successively in one of the embodiments,
Mirror, focal length are that positive the second lens and focal length are positive the third lens；First lens and the second lens are balsaming lens.
In one of the embodiments, the spacing distance between the first lens group and the third lens group be 36.5mm, second
Spacing distance between lens group and the third lens group is 2.3mm~18.95mm, between the third lens group and the 4th lens group
Spacing distance is 0.9mm~9.58mm, and the distance between the 4th lens group and sensitive chip are 18.5mm~29.2mm.
Compared with prior art, the present invention having at least the following advantages：
1, varifocal optical system of the invention has been used containing 12 pieces of lens including 3 pieces of aspherical glass lens, less
Higher quality, and small volume are obtained in the case of quantity, the transmitance of optical system is also higher；
2, camera lens FNO=EFL/D, EFL are focal length, and D is diaphragm diameter；For imaging lens, diaphragm diameter is bigger, thang-kng
Amount is bigger；Due to sensor meeting adjust automatically exposure value under general environment, at this time just than less going out FNO numerical value difference camera lenses
Quality, but under the environmental condition of low-light (level), exposure sensor has arrived the limit, therefore the small camera lens of FNO numerical value is than preferable
Performance；The varifocal optical system of the present invention uses iris diaphgram, and reaches 1.5 in nearly coke end FNO., and at focal length end, FNO reaches
To 2.4, there is high photosensitive property, in the case where adjusting aperture variation, is suitble to use under a variety of illuminating positions, can also adjust
Clarity is saved, optical system effect is improved；
3, varifocal optical system of the invention uses glass aspheric lenses, and plastic aspheric lens, therefore temperature is not used
Degree variation influences very little to the performance of optical system, can be used in a variety of contexts；
4, varifocal optical system of the invention has used 4 lens groups, and the interval between 4 lens groups is variation,
The variation at the interval between preceding 3 lens groups makes the focal length of optical system change, and the 4th lens group is for realizing focusing work(
Can, optical system reaches 12mm in short focus focal length, and focal length focal length is more than 40mm；
5, entire optical system of the invention is using the first lens group as peak, and between the first lens group and sensitive chip
Distance be it is not changed, length be less than 110mm, use 1 " in the camera lens of CCD, small volume；
6, the present invention can realize the resolution ratio higher than 14,000,000 pixels, by the 1 of 16.05mm " CCD for, the present invention
Center resolution can be reached higher than 180lp/mm, periphery 0.7H (70% diagonal positions) high resolution in the effect of 200lp/mm
Fruit；
7, varifocal optical system of the invention realizes AF automatic focusing functions using the 4th lens group, from farthest infinity
Can be at clearly image to nearest 1000mm microspurs, imaging effect is good；
8, optical system of the invention realizes whole infrared confocal, in visible wavelength section 430nm-650nm and infrared
Lamp wavelength period 830nm-870nm can reach clear simultaneously, therefore existing for a variety of wave bands under the conditions of keeps picture entirety all clear
It is clear；
Description of the drawings
Fig. 1 is the structural schematic diagram of one embodiment of the invention.
Specific implementation mode
It is further described below in conjunction with Fig. 1：
A kind of high-resolution, big image planes, small size, infrared confocal varifocal optical system, set successively from object side to image side
Have：
Focal length is positive the first lens group 1, focal length is minus second lens group 2, iris diaphgram 6, focal length are that positive third is saturating
Lens group 3, focal length are positive the 4th lens group 4 and sensitive chip 5；
First lens group 1, iris diaphgram 6 and the third lens group 3 fix with respect to sensitive chip 5, the second lens group 2 and the 4th
Lens group 4 can be moved forward and backward with respect to sensitive chip 5, optical system from short focus into long-focus change procedure, the second lens group 2
It is gradually moved to the third lens group 3, the effect of focusing is realized when the 4th lens group 4 is moved relative to sensitive chip 5；
The third lens group 3 includes three pieces of lens, what the one piece of non-spherical lens and the second lens group 2 being provided with were equipped with
One piece of non-spherical lens can carry out the correction of aberration；One piece of non-spherical lens that 4th lens group 4 is equipped with can carry out the curvature of field
Correction；
Wherein, the surface shape of above-mentioned non-spherical lens meets following relationship：
In formula, parameter c is the curvature corresponding to radius, and r is radial coordinate, and unit is identical with length of lens unit, and k is
Circular cone whose conic coefficient, when k-factor is less than -1, face shape curve is hyperbola, is parabola when k-factor is equal to -1, works as k
It is ellipse when coefficient is between -1 to 0, is circle when k-factor is equal to 0, is oblateness, α 1 to α 8 when k-factor is more than 0
The coefficient corresponding to each radial coordinate is indicated respectively, and the geomery of non-spherical lens can be accurately set by the above parameter.
It is the 7th positive lens that the third lens group 3 is equipped with focal length successively from object side to image side in one of the embodiments,
301, it is negative the 9th lens 303 that focal length, which is positive the 8th lens 302 and focal length,；7th lens 301 are non-spherical lens, can school
Positive major part aberration；Under the collective effect of three pieces of lens, spherical aberration can be effectively reduced, correcting chromatic aberration, reach infrared light with can
It is light-exposed have the effect of it is confocal.
It is the tenth positive lens that the 4th lens group 4 is equipped with focal length successively from object side to image side in one of the embodiments,
401, it is positive the 12nd lens 403 that focal length, which is negative the 11st lens 402 and focal length,；Tenth lens 401 and the 11st lens
402 be balsaming lens, can play the effect of focusing, and the 12nd lens 403 are non-spherical lens, can greatly reduce the curvature of field,
The positive and negative composite structure of 4th each piece of the lens group focal length of lens, the aberration that can effectively reduce optical system in zooming procedure become
Change.
The image side surface of the 12nd lens 403 is convex surface in one of the embodiments, can eliminate optical system appearance
The possibility of veiling glare, significant increase imaging effect.
The non-spherical lens is glass aspheric lenses in one of the embodiments, and it is saturating that plastic aspherical element is not used
Mirror, therefore temperature change influences very little to the performance of optical system, can be used in a variety of contexts.
The second lens group 2 is equipped with the 4th lens that focal length is negative from object side to image side successively in one of the embodiments,
201, it is positive the 6th lens 203 that focal length, which is negative the 5th lens 202 and focal length,；4th lens 201 are high refractive index, high dispersion
Lens made of material, refractive index are greater than or equal to 1.6, and Abbe number is less than or equal to 50, can effectively correct optical system
It unites in the distortion at short focus end, while the resolution ratio under short focus state can be greatly improved.
The focal length of the first lens 101 is negative in one of the embodiments, and the focal length of the second lens 102 is just that third is saturating
The focal length of mirror 103 is just；First lens 101 and the second lens 102 are balsaming lens.
The spacing distance between the first lens group 1 and the third lens group 3 is 36.5mm in one of the embodiments, the
Spacing distance between two lens groups 2 and the third lens group 3 is 2.3mm~18.95mm, the third lens group 3 and the 4th lens group 4
Between spacing distance be 0.9mm~9.58mm, the distance between the 4th lens group 4 and sensitive chip 5 for 18.5mm~
29.2mm。
As shown in table 1, it is the actual design case of the present invention：
Table 1
As shown in table 2, it is the asphericity coefficient of each non-spherical lens in an actual design case of the invention：
Table 2.
Claims (8)
1. a kind of high-resolution, big image planes, small size, infrared confocal varifocal optical system, it is characterised in that：From object side to picture
Side is equipped with successively：
Focal length is positive the first lens group (1), focal length is minus second lens group (2), iris diaphgram (6), focal length are positive third
Lens group (3), focal length are positive the 4th lens group (4) and sensitive chip (5)；
First lens group (1), iris diaphgram (6) and the third lens group (3) are fixed with respect to sensitive chip (5), the second lens group (2)
It can opposite sensitive chip (5) back-and-forth motion with the 4th lens group (4)；Optical system from short focus into long-focus change procedure,
Second lens group (2) is gradually mobile to the third lens group (3), realization pair when the 4th lens group (4) is mobile relative to sensitive chip (5)
Burnt effect；
Second lens group (2) is equipped with one piece of non-spherical lens；The third lens group (3) include three pieces of lens, be provided with one piece it is non-
Spherical lens；4th lens group (4) is equipped with one piece of non-spherical lens.
2. high-resolution according to claim 1, big image planes, small size, infrared confocal varifocal optical system, feature
It is：It is the positive the 8th that the third lens group (3) is equipped with focal length as the 7th positive lens (301), focal length successively from object side to image side
Lens (302) and focal length are the 9th lens (303) born；7th lens (301) are non-spherical lens.
3. high-resolution according to claim 1, big image planes, small size, infrared confocal varifocal optical system, feature
It is：It is the tenth born that 4th lens group (4) is equipped with focal length as the tenth positive lens (401), focal length successively from object side to image side
One lens (402) and focal length are the 12nd positive lens (403)；Tenth lens (401) and the 11st lens (402) are glued saturating
Mirror；12nd lens (403) are non-spherical lens.
4. high-resolution according to claim 3, big image planes, small size, infrared confocal varifocal optical system, feature
It is：The image side surface of 12nd lens (403) is convex surface.
5. high-resolution according to claim 1, big image planes, small size, infrared confocal varifocal optical system, feature
It is：The non-spherical lens is glass aspheric lenses.
6. high-resolution according to claim 1, big image planes, small size, infrared confocal varifocal optical system, feature
It is：Second lens group (2) is equipped with the 5th that the 4th lens (201), focal length that focal length is negative are negative from object side to image side successively
Lens (202) and focal length are the 6th positive lens (203)；The refractive index of 4th lens (201) is greater than or equal to 1.6, Abbe number
Less than or equal to 50.
7. high-resolution according to claim 1, big image planes, small size, infrared confocal varifocal optical system, feature
It is：It is positive second that first lens group (1) is equipped with the first lens (101), focal length that focal length is negative from object side to image side successively
Lens (102) and focal length are positive the third lens (103)；First lens (101) and the second lens (102) are balsaming lens.
8. high-resolution according to claim 1, big image planes, small size, infrared confocal varifocal optical system, feature
It is：Spacing distance between first lens group (1) and the third lens group (3) is 36.5mm, and the second lens group (2) and third are saturating
Spacing distance between lens group (3) is 2.3mm~18.95mm, the interval between the third lens group (3) and the 4th lens group (4)
Distance is 0.9mm~9.58mm, and the distance between the 4th lens group (4) and sensitive chip (5) are 18.5mm~29.2mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810477354.3A CN108681052B (en) | 2018-05-18 | 2018-05-18 | High-resolution, large-image-plane, small-volume and infrared confocal zoom optical system |
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|---|---|---|---|
| CN201810477354.3A CN108681052B (en) | 2018-05-18 | 2018-05-18 | High-resolution, large-image-plane, small-volume and infrared confocal zoom optical system |
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| CN108681052A true CN108681052A (en) | 2018-10-19 |
| CN108681052B CN108681052B (en) | 2023-07-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638588A (en) * | 2019-03-01 | 2020-09-08 | 杭州海康威视数字技术股份有限公司 | Optical zoom system, lens and camera |
| CN115079388A (en) * | 2022-06-17 | 2022-09-20 | 湖南长步道光学科技有限公司 | Full-frame optical system and film lens |
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| CN104101990A (en) * | 2013-04-04 | 2014-10-15 | 三星泰科威株式会社 | Zoom lens system |
| CN106772965A (en) * | 2017-01-22 | 2017-05-31 | 嘉兴中润光学科技有限公司 | A kind of zoom lens |
| CN208297821U (en) * | 2018-05-18 | 2018-12-28 | 中山联合光电科技股份有限公司 | High-resolution, big image planes, small size, infrared confocal zoom lens |
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| CN101261356A (en) * | 2007-03-09 | 2008-09-10 | 富士能株式会社 | Zoom lens with shock proof function and imaging apparatus |
| CN201662647U (en) * | 2009-05-08 | 2010-12-01 | 富士能株式会社 | Zooming lens and camera device |
| CN104101990A (en) * | 2013-04-04 | 2014-10-15 | 三星泰科威株式会社 | Zoom lens system |
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|---|---|---|---|---|
| CN111638588A (en) * | 2019-03-01 | 2020-09-08 | 杭州海康威视数字技术股份有限公司 | Optical zoom system, lens and camera |
| CN115079388A (en) * | 2022-06-17 | 2022-09-20 | 湖南长步道光学科技有限公司 | Full-frame optical system and film lens |
| CN115079388B (en) * | 2022-06-17 | 2023-07-04 | 湖南长步道光学科技有限公司 | Full-frame optical system and movie lens |
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| CN108681052B (en) | 2023-07-21 |
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