CN108681052B - High-resolution, large-image-plane, small-volume and infrared confocal zoom optical system - Google Patents
High-resolution, large-image-plane, small-volume and infrared confocal zoom optical system Download PDFInfo
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- CN108681052B CN108681052B CN201810477354.3A CN201810477354A CN108681052B CN 108681052 B CN108681052 B CN 108681052B CN 201810477354 A CN201810477354 A CN 201810477354A CN 108681052 B CN108681052 B CN 108681052B
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- 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 invention relates to the technical field of optical lenses, in particular to a high-resolution, large-image-plane, small-volume and infrared confocal zoom optical system, which comprises the following components in sequence from an object side to an image side: the lens comprises a first lens group with positive focal length, a second lens group with negative focal length, an iris diaphragm, a third lens group with positive focal length, a fourth lens group with positive focal length and a photosensitive chip; the first lens group, the iris diaphragm and the third lens group are fixed relative to the photosensitive chip, the second lens group and the fourth lens group can move back and forth relative to the photosensitive chip, the second lens group gradually moves to the third lens group in the process of changing the optical system from a short focal length to a long focal length, and the fourth lens group achieves focusing effect when moving relative to the photosensitive chip; the third lens group comprises three lenses, wherein one aspheric lens arranged in the third lens group and one aspheric lens arranged in the second lens group can correct aberration; one aspheric lens arranged in the fourth lens group can correct curvature of field.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to a high-resolution, large-image-plane, small-volume and infrared confocal zoom optical system.
Background
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:
the common zoom lens often cannot achieve compatibility of a large image plane and a volume, the volume of the lens is changed sharply when the image plane is increased, 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', is 16.0mm, the volume ratio is large, and the large-picture monitoring lens is mostly a fixed focus lens and is difficult to control when the monitoring distance is changed;
the resolution of the monitoring lens with high image quality on the market of the current mainstream is lower, the number of pixels is usually 1080p, and the number of pixels is 200 ten thousand, however, with the improvement of the data transmission speed, the picture transmission with higher image quality becomes possible, and 200 ten thousand pixels can not meet the requirements; the main current 1080P lens image surface is mainly 1/2.8 ', a 1/2.8' CMOS chip with the 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;
most of monitoring lenses in the current market are non-infrared confocal lenses, so that when the occasions with more optical wavelength bands such as evening or at night have partial lamplight illumination, the shot pictures cannot be wholly clear and can always have partial blurring;
disclosure of Invention
Accordingly, it is necessary to provide a zoom optical system for achieving the effects of high resolution, large image plane, small volume, and infrared confocal, in order to solve the above-mentioned problems.
A high-resolution, large image surface, small volume, infrared confocal zoom optical system, from object side to image side, is provided with:
the lens comprises a first lens group with positive focal length, a second lens group with negative focal length, an iris diaphragm, a third lens group with positive focal length, a fourth lens group with positive focal length and a photosensitive chip;
the first lens group, the iris diaphragm and the third lens group are fixed relative to the photosensitive chip, and the second lens group and the fourth lens group can move back and forth relative to the photosensitive chip; in the process of changing the optical system from the short focal length to the long focal length, the second lens group gradually moves to the third lens group, and the fourth lens group achieves focusing effect when moving relative to the photosensitive chip;
the second lens group is provided with an aspheric lens; the third lens group comprises three lenses, wherein one aspheric lens is arranged in the third lens group; the fourth lens group is provided with an aspheric lens.
In one embodiment, the third lens group is provided with a seventh lens with positive focal length, an eighth lens with positive focal length and a ninth lens with negative focal length in sequence from the object side to the image side; the seventh lens is an aspherical lens.
In one embodiment, the fourth lens group is provided with a tenth lens with positive focal length, an eleventh lens with negative focal length and a twelfth lens with positive focal length in sequence from the object side to the image side; the tenth lens and the eleventh lens are cemented lenses, and the twelfth lens is an aspherical lens.
In one embodiment, the image side surface of the twelfth lens is convex.
In one embodiment, the aspheric lens is a glass aspheric lens.
In one embodiment, the second lens group is provided with a fourth lens with a negative focal length, a fifth lens with a negative focal length and a sixth lens with a positive focal length in sequence from an object side to an image side; the refractive index of the fourth lens is greater than or equal to 1.6, and the Abbe number is less than or equal to 50.
In one embodiment, the first lens group is sequentially provided with a first lens with a negative focal length, a second lens with a positive focal length and a third lens with a positive focal length from an object side surface to an image side surface; the first lens and the second lens are cemented lenses.
In one embodiment, the spacing distance between the first lens group and the third lens group is 36.5mm, the spacing distance between the second lens group and the third lens group is 2.3 mm-18.95 mm, the spacing distance between the third lens group and the fourth lens group is 0.9 mm-9.58 mm, and the spacing distance between the fourth lens group and the photosensitive chip is 18.5 mm-29.2 mm.
Compared with the prior art, the invention has at least the following advantages:
1. the zoom optical system of the invention uses 12 lenses including 3 aspheric glass lenses, obtains higher quality under the condition of less quantity, has smaller volume and higher transmittance of the optical system;
2. lens fno=efl/D, EFL being focal length, D being aperture diameter; for an imaging lens, the larger the aperture diameter is, the larger the light flux is; 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, the exposure of the sensor is limited, so that the lens with small FNO value can better perform; the zoom optical system uses the iris diaphragm, the FNO at the near-focus end reaches 1.5, the FNO at the long-focus end reaches 2.4, the zoom optical system 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 effect of the optical system;
3. the zoom optical system 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 optical system and can be used in various environments;
4. the zoom optical system uses 4 lens groups, the interval between the 4 lens groups is changed, the focal length of the optical system is changed due to the change of the interval between the first 3 lens groups, the 4 th lens group is used for realizing a focusing function, the focal length of the optical system in short focus reaches 12mm, and the length Jiao Jiaoju is more than 40mm;
5. the whole optical system takes the first lens group as the highest point, the distance between the first lens group and the photosensitive chip is unchanged, the length of the whole optical system is smaller than 110mm, and the volume is smaller in a lens using a 1' CCD;
6. the invention can realize the resolution of more than 1400 ten thousand pixels, taking a CCD of 1' of 16.05mm as an example, the invention can achieve the effects that the resolution of the center is higher than 180lp/mm, and the resolution of the periphery is higher than 200lp/mm at 0.7H (70% diagonal position);
7. the zoom optical system realizes an AF automatic focusing function by utilizing the fourth lens group, can form clear images from the farthest infinity to the nearest 1000mm micro-distance, and has good imaging effect;
8. the optical system realizes full-range infrared confocal, and can be clear at the same time in the visible light wavelength band of 430nm-650nm and the infrared lamp wavelength band of 830nm-870nm, so that the whole picture is clear under the condition of existence of various wave bands;
drawings
Fig. 1 is a schematic structural view of an embodiment of the present invention.
Detailed Description
Further description is provided below in connection with fig. 1:
a high-resolution, large image surface, small volume, infrared confocal zoom optical system, from object side to image side, is provided with:
a first lens group 1 with positive focal length, a second lens group 2 with negative focal length, an iris 6, a third lens group 3 with positive focal length, a fourth lens group 4 with positive focal length and a photosensitive chip 5;
the first lens group 1, the iris 6 and the third lens group 3 are fixed relative to the photosensitive chip 5, the second lens group 2 and the fourth lens group 4 can move back and forth relative to the photosensitive chip 5, the second lens group 2 gradually moves towards the third lens group 3 in the process of changing the optical system from a short focal length to a long focal length, and the fourth lens group 4 achieves focusing effect when moving relative to the photosensitive chip 5;
the third lens group 3 includes three lenses, wherein one aspheric lens provided therein and one aspheric lens provided in the second lens group 2 can correct aberration; one aspheric lens arranged on the fourth lens group 4 can correct curvature of field;
wherein, the surface shape of the aspherical lens satisfies the following relation:
wherein, the parameter c is the curvature corresponding to the radius, r is the radial coordinate, the unit is the same as the lens length unit, k is the conic coefficient, the surface shape curve is hyperbolic when the k coefficient is smaller than-1, the parabola is parabolic when the k coefficient is equal to-1, the ellipse is when the k coefficient is between-1 and 0, the circle is when the k coefficient is equal to 0, the oblate is when the k coefficient is greater than 0, and alpha 1 to alpha 8 respectively represent the coefficients corresponding to the radial coordinates, and the shape and the size of the aspherical lens can be accurately set through the parameters.
In one embodiment, the third lens group 3 is provided with a seventh lens 301 with a positive focal length, an eighth lens 302 with a positive focal length, and a ninth lens 303 with a negative focal length in order from the object side to the image side; the seventh lens 301 is an aspherical lens, and can correct most of aberrations; under the combined action of the three lenses, the spherical aberration can be effectively reduced, the chromatic aberration is corrected, and the confocal effect of infrared light and visible light is achieved.
In one embodiment, the fourth lens group 4 is provided with a tenth lens 401 having a positive focal length, an eleventh lens 402 having a negative focal length, and a twelfth lens 403 having a positive focal length in order from the object side to the image side; the tenth lens 401 and the eleventh lens 402 are cemented lenses, which can play a focusing role, and the twelfth lens 403 is an aspheric lens, which can greatly reduce field curvature, and the positive and negative combination structure of the focal length of each lens of the fourth lens group can effectively reduce aberration variation of the optical system in the zooming process.
In one embodiment, the image side surface of the twelfth lens 403 is convex, so that the possibility of stray light in the optical system can be eliminated, and the imaging effect is greatly improved.
In one embodiment, the aspheric lens is a glass aspheric lens, and no plastic aspheric lens is used, so that the temperature change has little influence on the performance of the optical system, and the lens can be used in various environments.
In one embodiment, the second lens group 2 is provided with a fourth lens 201 with a negative focal length, a fifth lens 202 with a negative focal length, and a sixth lens 203 with a positive focal length in order from the object side to the image side; the fourth lens 201 is a lens made of a high-refractive-index and high-dispersion material, and has a refractive index of 1.6 or more and an abbe number of 50 or less, so that the distortion of the optical system at the short focal end can be effectively corrected, and the resolution in the short focal state can be greatly improved.
In one embodiment, the focal length of the first lens 101 is negative, the focal length of the second lens 102 is positive, and the focal length of the third lens 103 is positive; the first lens 101 and the second lens 102 are cemented lenses.
In one embodiment, the distance between the first lens group 1 and the third lens group 3 is 36.5mm, the distance between the second lens group 2 and the third lens group 3 is 2.3mm to 18.95mm, the distance between the third lens group 3 and the fourth lens group 4 is 0.9mm to 9.58mm, and the distance between the fourth lens group 4 and the photosensitive chip 5 is 18.5mm to 29.2mm.
As shown in table 1, a practical design case of the present invention:
TABLE 1
As shown in table 2, the aspherical coefficients of each aspherical lens in one practical design case of the present invention are:
TABLE 2
Claims (4)
1. A high-resolution, large-image-plane, small-volume and infrared confocal zooming optical system is characterized in that: the image sensor comprises a first lens group (1) with positive focal length, a second lens group (2) with negative focal length, an iris diaphragm (6), a third lens group (3) with positive focal length, a fourth lens group (4) with positive focal length and a photosensitive chip (5) which are sequentially arranged from an object side to an image side;
the first lens group (1), the iris diaphragm (6) and the third lens group (3) are fixed relative to the photosensitive chip (5), and the second lens group (2) and the fourth lens group (4) can move back and forth relative to the photosensitive chip (5); in the process of changing the optical system from a short focal length to a long focal length, the second lens group (2) gradually moves to the third lens group (3), and the fourth lens group (4) achieves focusing effect when moving relative to the photosensitive chip (5);
the second lens group (2) is provided with an aspheric lens; the third lens group (3) comprises three lenses, wherein one aspheric lens is arranged; the fourth lens group (4) is provided with an aspheric lens, and the third lens group (3) consists of a seventh lens (301) with positive focal length, an eighth lens (302) with positive focal length and a ninth lens (303) with negative focal length, which are sequentially arranged from the object side to the image side; the seventh lens (301) is an aspherical lens, and the fourth lens group (4) is composed of a tenth lens (401) with positive focal length, an eleventh lens (402) with negative focal length and a twelfth lens (403) with positive focal length, which are sequentially arranged from the object side to the image side; the tenth lens (401) and the eleventh lens (402) are cemented lenses; the twelfth lens (403) is an aspherical lens, and the second lens group (2) is composed of a fourth lens (201) with a negative focal length, a fifth lens (202) with a negative focal length and a sixth lens (203) with a positive focal length, which are sequentially arranged from the object side to the image side; the refractive index of the fourth lens (201) is larger than or equal to 1.6, the Abbe number is smaller than or equal to 50, and the first lens group (1) consists of a first lens (101) with a negative focal length, a second lens (102) with a positive focal length and a third lens (103) with a positive focal length, which are sequentially arranged from the object side to the image side; the first lens (101) and the second lens (102) are cemented lenses.
2. The high resolution, large image plane, small volume, infrared confocal zoom optical system of claim 1, wherein: the twelfth lens (403) has a convex image-side surface.
3. The high resolution, large image plane, small volume, infrared confocal zoom optical system of claim 1, wherein: the aspheric lens is a glass aspheric lens.
4. The high resolution, large image plane, small volume, infrared confocal zoom optical system of claim 1, wherein: the distance between the first lens group (1) and the third lens group (3) is 36.5mm, the distance between the second lens group (2) and the third lens group (3) is 2.3-18.95 mm, the distance between the third lens group (3) and the fourth lens group (4) is 0.9-9.58 mm, and the distance between the fourth lens group (4) and the photosensitive chip (5) is 18.5-29.2 mm.
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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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| CN108681052B true CN108681052B (en) | 2023-07-21 |
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| CN111638588B (en) * | 2019-03-01 | 2023-02-24 | 杭州海康威视数字技术股份有限公司 | Optical zoom system, lens and camera |
| 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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| 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 |
| 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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- 2018-05-18 CN CN201810477354.3A patent/CN108681052B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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