CN104142569B - Small-size, high-resolution and large-image-surface zoom optical system - Google Patents

Small-size, high-resolution and large-image-surface zoom optical system Download PDF

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Publication number
CN104142569B
CN104142569B CN201410409681.7A CN201410409681A CN104142569B CN 104142569 B CN104142569 B CN 104142569B CN 201410409681 A CN201410409681 A CN 201410409681A CN 104142569 B CN104142569 B CN 104142569B
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CN
China
Prior art keywords
lens
piece
eyeglass
focal length
resolution
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CN201410409681.7A
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Chinese (zh)
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CN104142569A (en
Inventor
王晓
李建华
龚俊强
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中山联合光电科技有限公司
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Priority to CN201410409681.7A priority Critical patent/CN104142569B/en
Publication of CN104142569A publication Critical patent/CN104142569A/en
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Abstract

The invention relates to a small-size, high-resolution and large-image-surface zoom optical system. The small size, high-resolution and large-image-surface zoom optical system comprises a light-sensitive chip. A first lens group and a third lens group which can be fixed relative to the light-sensitive chip are arranged on one side of the light-sensitive chip, a fourth lens group capable of moving relative to the light-sensitive chip is arranged between the third lens group and the light-sensitive chip, a second lens is arranged between the first lens group and the third lens group, can move relative to the light-sensitive chip and gradually moves to the third lens group in the process that the optical system changes from a short focal length to a long focal length, the focal length of first lens group, the focal length of the third lens group and the focal length of the four lens group are positive, the focal length of the second lens group is negative, and the front end and the rear end of the third lens group are respectively provided with an aspherical lens used for correcting most of the aberration to make a lens achieve high imaging quality. The small-size, high-resolution and large-image-surface zoom optical system has the advantages of being small in size, high in resolution and large in image surface, the infrared confocal effect can be achieved, and shot images are clear.

Description

A kind of smaller size smaller, high-resolution, the varifocal optical system of big image planes
【Technical field】
The present invention relates to a kind of varifocal optical system, more particularly to a kind of smaller size smaller for being applied to monitoring system, high score The varifocal optical system of resolution, big image planes.
【Background technology】
Currently in order to the demand in monitoring market, starts toward high-resolution and height as the direction of matter is developed, in order to obtain more preferably Image quality, using the bigger chip of pixel, it is basic that the more chips of pixel are often solved, and common monitoring Camera lens cannot often accomplish that big image planes are compatible with volume.
At present as the monitoring camera of matter, resolution is mostly 1080p to the height on the market of main flow, pixel number 2,000,000, so And with the lifting of data transmission bauds, the higher picture transmission as matter is possibly realized, 2,000,000 pixels can not meet need Ask;And the resolution of the camera lens of larger image planes is all not enough.
At present the camera lens image planes of the 1080P of main flow are mainly 1/2.8 ", using effectively the 1/ of imaging face diagonal 6.2mm As a example by the occasion of CMOS 2.8 ", its pixel size only has 2.8 μm, with center as 0 point, 0.8 image planes size and 6.2mm* 0.8/2=2.48 positions, the discernmible black and white line of institute reaches only 850TVline, and resolution is not very high.And due to Pixel very little, the performance such as its photonasty and color rendition is all less desirable, is badly in need of performance improvement;
The monitoring camera of big picture in the market, such as 1 " camera lens of left and right, image planes size reaches 16.0mm, its body Product is tight shot than larger mostly, is difficult to control to monitoring when distance changes.
Monitoring camera in the market, how non-infrared confocal camera lens, therefore be such as close in the more occasion of optical wavelength section Evening, or evening is when having part lighting, the picture of shooting cannot be integrally clear, always have obscure portions.
【The content of the invention】
The present invention seeks to overcome of the prior art not enough and provide a kind of smaller size smaller, high-resolution, big picture The infrared confocal varifocal optical system in face.
In order to solve above-mentioned technical problem, a kind of smaller size smaller, high-resolution, the zoom of big image planes of the present invention Optical system is employed the following technical solutions:
A kind of smaller size smaller, high-resolution, the varifocal optical system of big image planes, it is characterised in that:A kind of smaller size smaller, height The varifocal optical system of resolution, big image planes, it is characterised in that:The sensitive chip 5 that light is changed into the signal of telecommunication is included, The side of described sensitive chip 5 is provided with the first lens group 1 and the 3rd lens group 3 that the relative sensitive chip 5 of energy is fixed, the 3rd Be provided between lens group 3 and sensitive chip 5 can the relative movement of sensitive chip 5 the 4th lens group 4, in the first lens group 1 and Be provided between 3rd lens group 3 to move and the change in optical system from short focus to long-focus relative to sensitive chip 5 Gradually to the second lens group 2 of the movement of the 3rd lens group 3 in journey, the focal length of described the first lens group 1 for just, the 3rd lens group 3 focal length be just, the focal length of the 4th lens group 4 for just, the focal length of the second described lens group 2 be negative, in the second lens group 2 and Control is provided between 3rd lens group 3 into the diaphragm 6 of camera lens amount of beam, the front-end and back-end of the 3rd lens group 3 respectively set There is one piece for correcting most aberration, make camera lens obtain the aspherical lens 301 and 304 of higher image quality.
A kind of smaller size smaller, high-resolution, the varifocal optical system of big image planes as above, it is characterised in that:It is described Aspherical lens 301 and 304 on 3rd lens group 3 are Glass aspheric eyeglass.
A kind of smaller size smaller, high-resolution, the varifocal optical system of big image planes as above, it is characterised in that:Described 3rd The aspherical lens 301 and 304 of lens group 3, its aspherical surface shape meets below equation: + α 1y2+ α 2y4+ α 3y6+ α 4y8+ α 5y10+ α 6y12+ α 7y14+ α 8y16, in this formula, parameter c is the song corresponding to radius Rate, y is radial coordinate, and its unit is identical with length of lens unit, k be circular cone whose conic coefficient, when k-factor be less than -1 when face Sigmoid curves is hyperbola, is parabola when k-factor is equal to -1, is ellipse when k-factor is between -1 to 0, is during equal to 0 Circle, is oblateness during more than 0, and α 1 to α 8 represents respectively the coefficient corresponding to each radial coordinate, can be with essence by above parameter Really set the geomery of both-sided aspherical before and after lens.
A kind of smaller size smaller, high-resolution, the varifocal optical system of big image planes as above, it is characterised in that:It is described It is provided with the middle of 3rd lens group 3 made by the higher material of one piece of higher spherical lens of A Erbei numbers 302 and one piece of refractive index Spherical lenses 303, under their collective effect, can effective correcting chromatic aberration, so as to get infrared light has with luminous ray Confocal effect.
A kind of smaller size smaller, high-resolution, the varifocal optical system of big image planes as above, it is characterised in that:It is described Second lens group 2 include focal length be bear, high index of refraction and first piece of eyeglass 201 made by the material of high dispersion, focal length is negative Second piece of eyeglass 202, focal length is positive the 3rd piece eyeglass 203.
A kind of smaller size smaller, high-resolution, the varifocal optical system of big image planes as above, it is characterised in that:It is described Second piece of eyeglass 202 of the second lens group 2 and the 3rd piece of eyeglass 203 are cemented doublet.
A kind of smaller size smaller, high-resolution, the varifocal optical system of big image planes as above, it is characterised in that:It is described First lens group 1 is made up of three pieces of eyeglasses, wherein the focal length of first piece of eyeglass 101 for negative, second piece of focal length of eyeglass 102 for just, The 3rd piece of focal length of eyeglass 103 is for just.
A kind of smaller size smaller, high-resolution, the varifocal optical system of big image planes as above, it is characterised in that:It is described 4th lens group 4 can be made up of three pieces of eyeglasses, and it is negative first piece eyeglass 401 to include focal length, and focal length is positive second piece mirror Piece 402, focal length is positive the 3rd piece eyeglass 403, and eyeglass 402 is glued together acts primarily as 401, second piece of first piece of eyeglass To focus function, its positive and negative combination can effectively reduce the aberration change of camera lens in zooming procedure.
The invention has the beneficial effects as follows:
1st, zoom lens of the invention have been used containing 2 pieces of non-spherical glass lens in interior 13 pieces of eyeglasses, small number of In the case of obtain higher quality, and small volume, the transmitance of camera lens is also higher;
2nd, zoom lens of the invention use iriss, and reach 1.6 in nearly Jiao end FNO., and at focal length end, FNO. reaches To 2.4, there is high photosensitive property, in the case where aperture change is adjusted, be adapted to be used under various illuminating positions, can also adjust Section definition, improves lens effect;
3rd, zoom lens of the invention use Glass aspheric eyeglass, and plastic aspherical element eyeglass is not used, therefore temperature becomes Change the performance impact very little to camera lens, can use in a variety of contexts.
4th, zoom lens of the invention have used 4 eyeglass groups, and front 4 group intervals are to change, front 3 eyeglass groups The change of interblock space makes the focal length of camera lens change, and the 4th eyeglass group is used for focus function, and camera lens reaches in short focus focal length To 12mm, focal length focal length is more than 40mm;
5th, whole camera lens of the invention is with a group as peak, and a group is not change with the distance and position of image planes , it is highly less than 110mm, using 1 " in the camera lens of CCD, small volume;
6th, the present invention can reach the resolution higher than 10M (pixel of pixel 10,000,000), with the 1 of 16.05mm " CCD be Example, the present invention can reach center resolution higher than 160lp/mm, periphery 0.7H (70% diagonal positions) high resolutions in 1600tvline, high resolution;
7th, zoom lens of the invention realize AF automatic focusing functions using group 4, from farthest infinite as far as nearest 1000mm microspurs can be good into clearly image, imaging effect;
8th, camera lens of the invention realize it is whole infrared confocal, in visible wavelength section 430nm-650nm and infrared lamp ripple Long section 830nm-870nm can reach clearly simultaneously, therefore make picture overall all clear under conditions of various wave bands are present.
【Description of the drawings】
Fig. 1 is the system optics figure of the present invention.
【Specific embodiment】
Describe the present invention below in conjunction with the accompanying drawings:
As shown in figure 1, a kind of smaller size smaller, high-resolution, the varifocal optical system of big image planes, include the first lens group 1st, the second lens group 2, the 3rd lens group 3, the 4th lens group 4 and sensitive chip 5.It is saturating in second lens group 2 and the 3rd Diaphragm 6 is provided between lens group 3, diaphragm scalable enters the number of beams of camera lens.Described the second lens group 2, the 4th lens group 4 Position relative to sensitive chip during zoom is to change, and relative between the first lens group 1, the 3rd lens group 3 Position is fixed, and the relative position between the second lens group 2, the 4th lens group 4 is to change.
The distance between first lens group 1, the 3rd lens group 3 are fixed, and the second lens group is in the first lens group 1 and the Move between three lens groups 3.Second lens group 2 is gradually saturating to the 3rd in from short focus to the change procedure of long-focus Lens group 3 is drawn close.
This optical system is made up of 13 pieces of eyeglasses.
The focal length of the described entirety of the first lens group 1 is for just, first lens group 1 is made up of three pieces of eyeglasses, wherein first The focal length of piece eyeglass 101 is negative, second piece of eyeglass 102, the 3rd piece of focal length of eyeglass 103 for just.
The focal length of the entirety of the second lens group 2 is negative, and second lens group 2 is made up of three pieces of eyeglasses, wherein first piece The focal length of eyeglass 201 be bear, the focal length of second piece of eyeglass 202 be bear, the focal length of the 3rd piece of eyeglass 203 is being for just.Wherein first piece Lens 201 are the material for having used high index of refraction and high dispersion, and distortion of the camera lens in short focus can be effectively corrected herein;Together When can increase substantially resolution under short focus state, second piece of eyeglass 202 and the 3rd piece of eyeglass 203 are cemented doublet, can To reduce the moving range increase that the space in group is 2 groups, to obtain more zooming range.
The whole focal length of 3rd lens group 3 is for just, the 3rd lens group 3 is made up of four pieces of eyeglasses, wherein first piece of mirror The focal length of piece 301 is for just, second piece of focal length of eyeglass 302 is for just, the 3rd piece of eyeglass 303, the focal length of the 4th piece of eyeglass 304 are just. Wherein first piece eyeglass is Glass aspheric eyeglass, and 302 and 303 are bonding eyeglass, and 304 is Glass aspheric eyeglass, and the 3rd is saturating Lens group has used front-end and back-end to use two pieces of Glass aspheric eyeglasses 301 and 304 for correcting most aberration, makes camera lens Higher image quality is obtained, while reducing the distance of the 3rd lens group and the first lens group and sensitive chip, shortens lens body Product, and the 3rd group of camera lens aperture minimums, using aspherical lens camera lens cost can be reduced.Middle 2 pieces of spherical lenses 302 and 303 Resolution has used a piece of material that A Erbei numbers are higher and one piece of refractive index is higher, can effective correcting chromatic aberration, so as to get red Outer light and the confocal effect of luminous ray, and the picture color reduction for shooting is more preferable.
The focal length of the entirety of the 4th lens group 4 is sub in the present embodiment for just, the 4th lens group 4 can be made up of three pieces of eyeglasses In by one piece of focal length of eyeglass 401 be it is negative, second piece of eyeglass 402 for just, 401 and 402 it is glued together primarily serve focus function, Its positive and negative combination can effectively reduce the aberration change of camera lens in zooming procedure, and the 3rd piece of eyeglass 403 is focal length for just, and 2 face R values are closer to, and allow whole camera lens to obtain larger image planes, make maximum image planes reach 16.5mm.
First piece of eyeglass 301 of the 3rd lens group 3 and the 4th piece of eyeglass 304 are aspheric surface, and its aspherical surface shape is expired Sufficient below equation: In formula, parameter c is the curvature corresponding to radius, and y is radial coordinate (its unit and length of lens Unit is identical), k is circular cone whose conic coefficient.When k-factor is less than -1, face sigmoid curves is hyperbola, is parabolic during equal to -1 Line, is ellipse when between -1 to 0, is circle during equal to 0, is oblateness during more than 0.α1To α8Represent that each radial direction is sat respectively The corresponding coefficient of mark, by the above parameter geomery of both-sided aspherical before and after lens can be accurately set.
Camera lens FNO=EFL (focal length)/D (diaphragm diameter), for tight shot, diaphragm diameter is bigger, and thang-kng amount is got over Greatly;Due to sensor meeting adjust automatically exposure value under general environment, now just than less going out the good of FNO numerical value difference camera lens It is bad, but under the environmental condition of low-light (level), exposure sensor has arrived the limit, therefore the little camera lens of FNO numerical value than preferably table Existing, the zoom lens of the present invention use iriss, and reach 1.6 in nearly Jiao end FNO., and at focal length end 2.4 are reached, and have pole High photosensitive property, in the case where aperture change is adjusted, is adapted to be used under various illuminating positions, can also adjust definition.
Name the actual design case of a high-power zoom lens:
Aspheric surface parameter:
Group's zoom, focusing mobile scope:
Interval 22.5mm between 1~3 group
Interval 22.6mm~2.1mm between 2~3 groups
The distance between 3~4 groups 0.75mm~12.1mm
4~image planes are apart from 17.5-34.5mm

Claims (6)

1. a kind of smaller size smaller, high-resolution, the varifocal optical system of big image planes, it is characterised in that:Include and change light For the sensitive chip (5) of the signal of telecommunication, the side of described sensitive chip (5) is provided with can relative the first lens group (1) that it is fixed With the 3rd lens group (3), being provided between the 3rd lens group (3) and sensitive chip (5) can be relative to sensitive chip (5) movement 4th lens group (4), be provided between the first lens group (1) and the 3rd lens group (3) can relative sensitive chip (5) move, And gradually to the second lens group that the 3rd lens group (3) is mobile in optical system is from short focus to the change procedure of long-focus (2) focal length of, described the first lens group (1), the 3rd lens group (3) and the 4th lens group (4) is just the second described lens The focal length of group (2) is negative, and control is provided between the second lens group (2) and the 3rd lens group (3) into the light of camera lens amount of beam Late (6), the front-end and back-end of the 3rd lens group (3) are respectively provided with one piece for correcting most aberration, obtain camera lens The aspherical lens (301,304) of higher image quality, the 4th lens group (4) can be made up of three pieces of eyeglasses, be included Focal length is negative first piece eyeglass (401), and focal length is positive second piece eyeglass (402), and focal length is positive the 3rd piece eyeglass (403), first piece of eyeglass (401), second piece of eyeglass (402) is glued together primarily serves focus function, its is positive and negative Combination can effectively reduce the aberration change of camera lens in zooming procedure, and first lens group (1) is made up of three pieces of eyeglasses, its In the focal length of first piece of eyeglass (101) be negative, second piece of eyeglass (102) and the 3rd piece of eyeglass (103) focal length is all just.
2., according to a kind of smaller size smaller described in claim 1, high-resolution, the varifocal optical system of big image planes, its feature exists In:The aspherical lens (301,304) are Glass aspheric eyeglass.
3., according to a kind of smaller size smaller described in claim 2, high-resolution, the varifocal optical system of big image planes, its feature exists In:Aspherical lens (301,304) its aspherical surface shape of 3rd lens group (3) meets below equation: In formula, parameter c is the curvature corresponding to radius, and y is radial coordinate, and its unit is identical with length of lens unit, and k is circular cone two Secondary curve coefficients, when k-factor is less than -1, face sigmoid curves is hyperbola, is parabola during equal to -1, is when between -1 to 0 Ellipse, is circle during equal to 0, is oblateness, α during more than 01To α8Represent the coefficient corresponding to each radial coordinate respectively, by with Upper parameter can accurately set the geomery of both-sided aspherical before and after lens.
4., according to a kind of smaller size smaller described in claim 3, high-resolution, the varifocal optical system of big image planes, its feature exists In:The one piece of higher spherical lenses of A Erbei number (302) is provided with the middle of 3rd lens group (3) and one piece of refractive index is higher Spherical lenses made by material (303), can effective correcting chromatic aberration, so as to get infrared light has confocal effect with luminous ray Really.
5., according to a kind of smaller size smaller described in claim 4, high-resolution, the varifocal optical system of big image planes, its feature exists In:Second lens group (2) include focal length be bear, made by high index of refraction and the material of high dispersion for effectively correction Distortion of the camera lens in short focus, while first piece of eyeglass (201) of the resolution under short focus state, focal length can be increased substantially For the second piece of eyeglass (202) born, focal length is positive the 3 piece eyeglass (203).
6., according to a kind of smaller size smaller described in claim 5, high-resolution, the varifocal optical system of big image planes, its feature exists In:Second piece of eyeglass (202) and the 3rd piece of eyeglass (203) of second lens group (2) is cemented doublet.
CN201410409681.7A 2014-08-19 2014-08-19 Small-size, high-resolution and large-image-surface zoom optical system CN104142569B (en)

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KR20170133748A (en) * 2016-05-26 2017-12-06 한화테크윈 주식회사 Zoom lens system
CN109445080B (en) * 2018-12-29 2021-02-02 浙江大华技术股份有限公司 Lens
CN111158103A (en) * 2019-12-31 2020-05-15 Oppo广东移动通信有限公司 Zoom lens, camera module and electronic device
CN111175952A (en) * 2019-12-31 2020-05-19 Oppo广东移动通信有限公司 Zoom lens, camera module and electronic device

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