CN108563005B - High-resolution, small-volume and large-image-surface zoom optical system - Google Patents
High-resolution, small-volume and large-image-surface zoom optical system Download PDFInfo
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- CN108563005B CN108563005B CN201810263126.6A CN201810263126A CN108563005B CN 108563005 B CN108563005 B CN 108563005B CN 201810263126 A CN201810263126 A CN 201810263126A CN 108563005 B CN108563005 B CN 108563005B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 20
- 239000011521 glass Substances 0.000 claims abstract description 12
- 238000003384 imaging method Methods 0.000 claims description 9
- 230000004075 alteration Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 206010034972 Photosensitivity reaction Diseases 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000036211 photosensitivity Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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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 +-+
Abstract
The invention discloses a high-resolution, small-volume and large-image-surface zooming optical system, which comprises a photosensitive chip for converting light into electric signals, wherein a first lens group and a third lens group which can be fixed relative to the photosensitive chip are arranged on one side of the photosensitive chip, a fourth lens group which can move relative to the photosensitive chip is arranged between the third lens group and the photosensitive chip, a second lens group is arranged between the first lens group and the third lens group, the focal length of the first lens group is positive, the focal length of the third lens group is positive, the focal length of the fourth lens group is positive, the focal length of the second lens group is negative, and a diaphragm for controlling the quantity of light beams entering the lens is arranged between the second lens group and the third lens group. The zoom lens provided by the invention uses 13 lenses including 3 aspheric glass lenses, obtains higher quality under the condition of a smaller number, and has smaller volume and higher transmittance.
Description
[ field of technology ]
The present invention relates to a zoom optical system, and more particularly, to a high-resolution, small-volume, large-image-surface zoom optical system for use in a monitoring system.
[ background Art ]
Currently, the zoom lens is widely applied to daily life of people, the current market is developed in the directions of high resolution and high image quality, in order to obtain better imaging quality, the use of larger pixels and more chips of the pixels are one of the fundamental ways of solving the problems, but the current security monitoring and road condition monitoring devices have the following defects:
1. the common zoom lens often cannot achieve compatibility of a large image plane and a volume, the increase of the image plane can cause abrupt change of the volume of the lens, and the size of the image plane of a large-picture monitoring lens in the current market, such as a lens with the size of about 1', reaches 16.0mm, is large in volume, is a fixed focus lens in many cases, and is difficult to control when the monitoring distance is changed. The method comprises the steps of carrying out a first treatment on the surface of the
2. The resolution is low, and the resolution is 1080p, and the number of pixels is 200 ten thousand, however, with the improvement of the data transmission speed, the higher image quality image transmission is possible, and 200 ten thousand pixels cannot meet the requirement. The main current 1080P lens image surface is mainly 1/2.8 ', a 1/2.8' CMOS chip with an effective imaging surface diagonal of 6.2mm is used, the pixel point size is only 2.8 mu m, and the resolution is not very high. Moreover, as the pixel points are very small, the performances of photosensitivity, color reduction and the like are not ideal, and the improvement of the performances is urgently needed;
3. the monitoring lens in the current market is a plurality of non-infrared confocal lenses, so that when the occasion with more optical wavelength bands such as evening or at night has partial lamplight illumination, the shot picture cannot be wholly clear and always has partial blurring.
[ invention ]
The invention aims to overcome the defects in the prior art and provide the infrared confocal zoom optical system with high resolution, small volume and large image plane.
In order to solve the technical problems, the invention adopts the following technical scheme:
the zoom optical system with high resolution, small volume and large image surface is characterized by comprising a photosensitive chip 5 for converting light into electric signals, wherein one side of the photosensitive chip 5 is provided with a first lens group 1 and a third lens group 3 which can be fixed relative to the photosensitive chip 5, a fourth lens group 4 which can move relative to the photosensitive chip 5 is arranged between the third lens group 3 and the photosensitive chip 5, a second lens group 2 which can move relative to the photosensitive chip 5 and gradually move towards the third lens group 3 in the changing process of an optical system from a short focal length to a long focal length is arranged between the first lens group 1 and the third lens group 3, the focal length of the first lens group 1 is positive, the focal length of the third lens group 3 is positive, the focal length of the fourth lens group 4 is positive, a diaphragm 6 for controlling the quantity of entering light beams is arranged between the second lens group 2 and the third lens group 3, the second lens group 2 is provided with a first lens group for correcting aberration, the second lens group 202 for obtaining high quality imaging lens groups is arranged between the second lens group 2 and the third lens group 3, and a first lens group 301 for obtaining high quality imaging lens group is arranged at the front end of the first lens group and the third lens group is provided with a third lens group for obtaining high quality imaging lens 304.
The zoom optical system with high resolution, small volume and large image surface is characterized in that the focal length of the whole first lens group 1 is positive, and the first lens group 1 consists of three lenses and comprises a first lens group first lens 101; a first lens group second lens 102 and a first lens group third lens 103; wherein the focal length of the first lens group 101 is negative, the focal length of the first lens group 102 is positive, and the focal length of the first lens group 103 is positive.
The zoom optical system with high resolution, small volume and large image surface is characterized in that the focal length of the whole second lens group 2 is negative, and the second lens group 2 further comprises a second lens group first lens 201 and a second lens group third lens 203; wherein the focal length of the first lens 201 of the second lens group is negative, the focal length of the second lens 202 of the second lens group is negative, the second lens 202 of the second lens group is an aspherical glass lens, and the focal length of the third lens 203 of the second lens group is positive.
The zoom optical system with high resolution, small volume and large image surface is characterized in that the overall focal length of the third lens group 3 is positive, and the third lens group 3 further comprises a third lens group second lens 302 and a third lens group third lens 303; wherein the focal length of the first lens group 301 is negative, the focal length of the second lens group 302 is positive, the focal length of the third lens group 303 is positive, the focal length of the fourth lens group 304 is negative, the first lens group 301 is a glass aspheric lens, and the fourth lens group 304 is a glass aspheric lens; the four lenses are distributed symmetrically as a whole.
The zoom optical system with high resolution, small volume and large image surface as described above is characterized in that the focal length of the whole fourth lens group 4 is positive, and the fourth lens group 4 may be composed of three lenses, including a fourth lens group first lens 401, a fourth lens group second lens 402 and a fourth lens group third lens 403; the focal length of the first lens group 401 of the fourth lens group is negative, the focal length of the second lens group 402 of the fourth lens group is positive, the first lens group 401 of the fourth lens group and the second lens group 402 of the fourth lens group are glued together, the third lens group 403 of the fourth lens group is negative in focal length, and the second face is convex.
A high-resolution, small-volume, large-image-surface zoom optical system as described above, wherein the aspheric surface shapes of the second lens group second lens 202, the third lens group first lens 301 and the third lens group fourth lens 304 satisfy the following equations:
in the formula, the parameter c is the curvature corresponding to the radius, r is the radial coordinate, the unit of the radius is the same as the unit of the lens length, k is a conic coefficient, when the k coefficient is smaller than-1, the surface shape curve of the lens is a hyperbola, and when the k coefficient is equal to-1, the surface shape curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface shape curve of the lens is elliptical, when the k coefficient is equal to 0, the surface shape curve of the lens is circular, when the k coefficient is greater than 0, the surface shape curve of the lens is oblate, and alpha 1 To alpha 8 The coefficients corresponding to the radial coordinates are respectively represented.
The beneficial effects of the invention are as follows:
1. the zoom lens provided by the invention uses 13 lenses including 3 aspheric glass lenses, obtains higher quality under the condition of a smaller number, and has smaller volume and higher transmittance.
2. The zoom lens provided by the invention uses the iris diaphragm, and the near-focus end FNO reaches 1.6, and the long-focus end FNO reaches 2.4, so that the zoom lens has extremely high photosensitivity, is suitable for being used under various illumination conditions under the condition of adjusting aperture change, and can also adjust definition and improve the lens effect.
3. The zoom lens of the invention uses the glass aspheric lens and does not use the plastic aspheric lens, so the temperature change has little influence on the performance of the lens, and the zoom lens can be used in various environments.
4. The zoom lens provided by the invention uses 4 lens groups, the interval between the first 4 lens groups is changed, the focal length of the lens is changed due to the change of the interval between the first 3 lens groups, the 4 th lens group is used for focusing, the focal length of the lens reaches 12mm in short focus, and the length Jiao Jiaoju is more than 40mm.
5. The whole lens of the invention takes a group as the highest point, the distance position between the group and the image plane is unchanged, the height is less than 110mm, and the volume is smaller in the lens using 1' CCD.
6. The invention can reach resolution higher than 12M (1200 ten thousand pixels of pixels), taking a CCD of 1' of 16.05mm as an example, the invention can reach resolution higher than 180lp/mm in the center and higher than 1800tvline in the periphery of 0.7H (70% diagonal position), and the resolution is high.
7. The zoom lens provided by the invention realizes an AF automatic focusing function by utilizing the fourth lens group 4, and can form clear images from the farthest infinity to the nearest 1500mm micro-distance, so that the imaging effect is good.
8. The lens realizes full-range infrared confocal, and can achieve definition at the same time in the visible light wavelength range of 430nm-650nm and the infrared lamp wavelength range of 830nm-870nm, so that the whole picture is clear under the condition of existence of various wave bands.
[ description of the drawings ]
Fig. 1 is an optical diagram of a system of the present invention.
[ detailed description ] of the invention
The invention is described in detail below with reference to the attached drawing figures:
as shown in fig. 1, a high-resolution, small-volume, large-image-surface zoom optical system includes a first lens group 1, a second lens group 2, a third lens group 3, a fourth lens group 4, and a photosensitive chip 5. A diaphragm 6 is arranged between the second lens group 2 and the third lens group 3, and the diaphragm can adjust the quantity of light beams entering the lens. The positions of the second lens group 2 and the fourth lens group 4 relative to the photosensitive chip in the zooming process are changed, the relative positions of the first lens group 1 and the third lens group 3 are fixed, and the relative positions of the second lens group 2 and the fourth lens group 4 are changed. The distance between the first lens group 1 and the third lens group 3 is fixed, and the second lens group moves between the first lens group 1 and the third lens group 3. The second lens group 2 gradually approaches the third lens group 3 during the change from the short focal length to the long focal length.
The optical system consists of 13 lenses, the focal length of the whole first lens group 1 is positive, and the first lens group 1 consists of three lenses and comprises a first lens group first lens 101; a first lens group second lens 102, a first lens group third lens 103; wherein the focal length of the first lens group 101 is negative, the focal length of the first lens group 102 is positive, and the focal length of the first lens group 103 is positive.
The focal length of the whole second lens group 2 is negative, and the second lens group 2 consists of three lenses, including a second lens group first lens 201, a second lens group second lens 202 and a second lens group third lens 203; wherein the focal length of the first lens group 201 is negative, the focal length of the second lens group 202 is negative, and the focal length of the third lens group 203 is positive. Wherein the second lens group first lens 201 is made of high refractive index and high dispersion material, and can effectively correct distortion of the lens in short focus; meanwhile, the resolution in the short focal state can be greatly improved, and the lens distortion can be further reduced by using an aspherical lens for the second lens group 202.
The overall focal length of the third lens group 3 is positive, the third lens group 3 is composed of four lenses, a third lens group first lens 301, a third lens group second lens 302, a third lens group third lens 303 and a third lens group fourth lens 304; wherein the focal length of the first lens group 301 is negative, the focal length of the second lens group 302 is positive, the focal length of the third lens group 303 is positive, and the focal length of the fourth lens group 304 is negative. The third lens group first lens 301 is a glass aspheric lens, the third lens group fourth lens 304 is a glass aspheric lens, the third lens group uses two glass aspheric lenses at the front end and the rear end, and the third lens group third lens 303 and the third lens group fourth lens 304 are used for correcting most of aberration, so that the lens obtains higher imaging quality, meanwhile, the distance between the third lens group and the first lens group and the distance between the third lens group and the photosensitive chip are reduced, the lens volume is shortened, the aperture of the third lens group lens is minimum, and the cost of the lens can be reduced by using the aspheric lens. The intermediate third lens group second lens 302 and the third lens group third lens 303 are made of materials with higher abbe numbers, so that chromatic aberration can be effectively corrected, the confocal effect of infrared light and visible light can be obtained, and the color of a shot picture is better reduced.
The focal length of the whole fourth lens group 4 is positive, and the fourth lens group 4 can be composed of three lenses, including a fourth lens group first lens 401, a fourth lens group second lens 402 and a fourth lens group third lens 403; the focal length of the first lens group 401 of the fourth lens group is negative, the focal length of the second lens group 402 of the fourth lens group is positive, the first lens group 401 of the fourth lens group and the second lens group 402 of the fourth lens group are glued together to mainly play a focusing function, the positive and negative combination can effectively reduce aberration variation of the lens in the zooming process, the third lens group 403 of the fourth lens group is negative in focal length, and the second surface is convex, so that stray light and ghost images are effectively reduced. The aspherical lenses 202, 301 and 304 in the second and third groups have aspherical surface shapes satisfying the following equations
In the formula, the parameter c is the curvature corresponding to the radius, r is the radial coordinate, the unit of the radius is the same as the unit of the lens length, k is a conic coefficient, when the k coefficient is smaller than-1, the surface shape curve of the lens is a hyperbola, and when the k coefficient is equal to-1, the surface shape curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface shape curve of the lens is elliptical, when the k coefficient is equal to 0, the surface shape curve of the lens is circular, when the k coefficient is greater than 0, the surface shape curve of the lens is oblate, and alpha 1 To alpha 8 The coefficients corresponding to the radial coordinates are respectively represented.
Lens fno=efl (focal length)/D (aperture diameter), with an imaging lens, the larger the aperture diameter, the larger the light flux; under the general environment, the sensor can automatically adjust the exposure value, so that the quality of lenses with different FNO values can not be improved, but under the low-illumination environment condition, the exposure of the sensor is limited, so that the lens with small FNO value can better perform.
The following is a practical design case of a high power zoom lens:
group zoom, focus movement range:
the interval between the first lens group and the third lens group is 36mm;
the interval between the second lens group and the third lens group is 22 mm-2.2 mm;
the distance between the third lens group and the fourth lens group is 0.6 mm-7 mm;
the distance between the fourth lens group and the image plane is 22mm-28.6mm.
Claims (2)
1. A high-resolution, small-volume and large-image-surface zooming optical system is characterized by comprising a photosensitive chip (5) for converting light into an electric signal, a first lens group (1) and a third lens group (3) which can be fixed relative to the photosensitive chip (5) are arranged on one side of the photosensitive chip (5), a fourth lens group (4) which can move relative to the photosensitive chip (5) is arranged between the third lens group (3) and the photosensitive chip (5), a second lens group (2) which can move relative to the photosensitive chip (3) and gradually move towards the third lens group (3) in the process of changing the optical system from a short focal length to a long focal length is arranged between the first lens group (1) and the third lens group (3), the focal length of the first lens group (1) is positive, the focal length of the third lens group (3) is positive, the focal length of the second lens group (2) is negative, a diaphragm (6) which controls the entering into the second lens group (2) is arranged between the second lens group (2) and the third lens group (3), and a first lens (3) is used for correcting aberration of high quality is arranged at the front end of each lens (3), a third lens group first lens (301) and a third lens group fourth lens (304) for making the lens obtain high imaging quality; the focal length of the whole first lens group (1) is positive, and the first lens group (1) consists of three lenses and comprises a first lens group first lens (101); a first lens group second lens (102) and a first lens group third lens (103); wherein the focal length of the first lens group first lens (101) is negative, the first lens group second lens (102), the first lens group third lens (103) is positive; the focal length of the whole second lens group (2) is negative, and the second lens group (2) further comprises a second lens group first lens (201) and a second lens group third lens (203); wherein the focal length of the first lens group (201) is negative, the focal length of the second lens group (202) is negative, the second lens group (202) is an aspherical glass lens, and the focal length of the third lens group (203) is positive; the overall focal length of the third lens group (3) is positive, and the third lens group (3) further comprises a third lens group second lens (302) and a third lens group third lens (303); wherein the focal length of the first lens group (301) is negative, the focal length of the second lens group (302) is positive, the focal length of the third lens group (303) is positive, the focal length of the fourth lens group (304) is negative, the first lens group (301) is a glass aspheric lens, and the fourth lens group (304) is a glass aspheric lens; the focal length of the whole fourth lens group (4) is positive, and the fourth lens group (4) can be composed of three lenses, and comprises a fourth lens group first lens (401), a fourth lens group second lens (402) and a fourth lens group third lens (403); the focal length of the first lens group (401) of the fourth lens group is negative, the focal length of the second lens group (402) of the fourth lens group is positive, the first lens group (401) of the fourth lens group and the second lens group (402) of the fourth lens group are glued together, the third lens group (403) of the fourth lens group is negative in focal length, and the image side surface of the third lens group (403) of the fourth lens group is convex; the interval between the first lens group and the third lens group is 36mm.
2. A high resolution, small volume, large image plane zoom optical system as claimed in claim 1, wherein the second lens group second lens (202), third lens group first lens (301) and third lens group fourth lens (304) have aspherical surface shapes satisfying the following equation:
in the formula, the parameter c is the curvature corresponding to the radius, r is the radial coordinate, the unit of the radius is the same as the unit of the lens length, k is a conic coefficient, when the k coefficient is smaller than-1, the surface shape curve of the lens is a hyperbola, and when the k coefficient is equal to-1, the surface shape curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface shape curve of the lens is elliptical, when the k coefficient is equal to 0, the surface shape curve of the lens is circular, when the k coefficient is greater than 0, the surface shape curve of the lens is oblate, and alpha 1 To alpha 8 The coefficients corresponding to the radial coordinates are respectively represented.
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| CN201810263126.6A CN108563005B (en) | 2018-03-28 | 2018-03-28 | High-resolution, small-volume and large-image-surface zoom optical system |
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| CN201810263126.6A CN108563005B (en) | 2018-03-28 | 2018-03-28 | High-resolution, small-volume and large-image-surface zoom optical system |
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| CN108563005B true CN108563005B (en) | 2023-11-10 |
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| CN112067020B (en) * | 2020-09-17 | 2022-09-20 | 西安中科微星光电科技有限公司 | Optical system of star simulator with ultra-large field of view and high resolution |
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| JP2004029765A (en) * | 2002-05-10 | 2004-01-29 | Pentax Corp | Zoom lens system |
| CN101051113A (en) * | 2006-04-05 | 2007-10-10 | 扬明光学股份有限公司 | Zoom lens |
| JP2009122620A (en) * | 2007-10-26 | 2009-06-04 | Panasonic Corp | Zoom lens system and camera system |
| JP2010152145A (en) * | 2008-12-25 | 2010-07-08 | Panasonic Corp | Zoom lens system, imaging apparatus, and camera |
| 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 |
| CN107045186A (en) * | 2017-05-05 | 2017-08-15 | 嘉兴中润光学科技有限公司 | Zoom lens and its camera device |
-
2018
- 2018-03-28 CN CN201810263126.6A patent/CN108563005B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004029765A (en) * | 2002-05-10 | 2004-01-29 | Pentax Corp | Zoom lens system |
| CN101051113A (en) * | 2006-04-05 | 2007-10-10 | 扬明光学股份有限公司 | Zoom lens |
| JP2009122620A (en) * | 2007-10-26 | 2009-06-04 | Panasonic Corp | Zoom lens system and camera system |
| JP2010152145A (en) * | 2008-12-25 | 2010-07-08 | Panasonic Corp | Zoom lens system, imaging apparatus, and camera |
| 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 |
| CN107045186A (en) * | 2017-05-05 | 2017-08-15 | 嘉兴中润光学科技有限公司 | Zoom lens and its camera device |
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