CN112415720A - Super-large wide-angle high-low temperature resistant optical monitoring system - Google Patents
Super-large wide-angle high-low temperature resistant optical monitoring system Download PDFInfo
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- CN112415720A CN112415720A CN202011433305.3A CN202011433305A CN112415720A CN 112415720 A CN112415720 A CN 112415720A CN 202011433305 A CN202011433305 A CN 202011433305A CN 112415720 A CN112415720 A CN 112415720A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- Optics & Photonics (AREA)
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Abstract
The invention discloses an ultra-large wide-angle high-low temperature resistant optical monitoring system, which comprises: the optical lens system has the advantages that the optical lens system achieves high resolving power, enables spherical aberration, coma aberration, astigmatism, field curvature, chromatic aberration of magnification and positional aberration of the lens system to be well corrected, ensures uniform imaging on the whole image surface, meets the use requirement of high pixels, and has a compact structure, a small outline size, an increased field angle and high and low temperature resistance.
Description
Technical Field
The invention relates to an ultra-large wide-angle high-low temperature resistant optical monitoring system.
Background
The wide-angle lens is more and more widely applied to the fields of security monitoring, network camera shooting and automobile auxiliary driving, the performance of the lens directly influences the imaging quality and the imaging visual field, the technical index requirements of the wide-angle lens are continuously improved, the large wide-angle monitoring lens in the market is generally smaller than 190 degrees, the problems that the number of lenses is large, the structure is complex, the cost is high and the like when the angle of view is larger than 190 degrees are generally existed, and therefore the requirements of light weight, total length, high and low temperature resistance and larger angle of view are provided for the monitoring lens by the market requirements.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an ultra-large wide-angle high-temperature and low-temperature resistant optical monitoring system.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an ultra-large wide-angle high-low temperature resistant optical monitoring system, comprising: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a diaphragm, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with positive focal power and an optical filter which are arranged in sequence from the object side to the image side along the optical axis, the first lens with negative focal power is a glass lens, the surface facing the object side is a convex surface, the second lens with negative focal power is a glass lens with a convex surface facing the object side, the third lens with negative focal power is a plastic aspheric lens with a convex surface facing the object side, the fourth lens with positive focal power is a double-convex glass lens, the fifth lens with negative focal power is a double-concave glass lens, the sixth lens with positive focal power is a biconvex glass lens, and the seventh lens with positive focal power is a biconvex plastic aspheric lens.
Preferably, the effective focal length of the first lens with negative optical power is f1, the effective focal length of the second lens with negative optical power is f2, and the ratio of f1 to f2 is 1.5< f1/f2< 1.8.
Preferably, the refractive index of the third lens having negative power is greater than 1.45 and less than 1.65.
Preferably, the effective focal length of the third lens with negative optical power is f3, the effective focal length of the fourth lens with positive optical power is f4, the effective focal length of the fifth lens with negative optical power is f5, the first lens with negative optical power, the second lens with negative optical power, the third lens with negative optical power, the fourth lens with positive optical power, the diaphragm, the fifth lens with negative optical power, the sixth lens with positive optical power, the seventh lens with positive optical power and the optical filter are respectively provided with the effective focal length f, the ratio of f1 to f4 is-4.5 < f1/f4 < -2.5, the ratio of f3 to f2 is 0.5 < f3/f 2<1.8, and the ratio of f5 to f is-2.1 < f 5/f-0.7.
Preferably, the total length of the first lens with negative focal power, the second lens with negative focal power, the third lens with negative focal power, the fourth lens with positive focal power, the diaphragm, the fifth lens with negative focal power, the sixth lens with positive focal power, the seventh lens with positive focal power and the optical filter is less than 20 mm.
Preferably, the refractive index of the fifth lens having negative power is greater than 1.85.
Preferably, the refractive index of the fourth lens having positive power and the refractive index of the sixth lens having positive power are both greater than 1.75.
The invention has the following beneficial effects: the third lens and the seventh lens are plastic lenses, and the other five lenses are glass lenses, so that the optical monitoring system formed by the lenses with specific structural shapes and distributed reasonably in optical power can achieve high resolution under a compact framework; in addition, the number of the lenses is only 7, so that the structure is simple, the cost is reduced, and the research and development period is shortened; the optical lens system provided by the invention has better matching of parameters such as the structural shape, the refractive index of the lens material and the like and imaging conditions, so that the spherical aberration, the coma aberration, the astigmatism, the field curvature, the magnification chromatic aberration and the position chromatic aberration of the lens system are well corrected, the uniform imaging on the whole image surface is ensured, the use requirement of high pixels is met, and the optical lens system has the advantages of compact structure, small appearance size, increased field angle and high and low temperature resistance.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an MTF analytical graph at 25 ℃ of the present invention;
FIG. 3 is an MTF analysis graph at 80 ℃ of high temperature according to the present invention;
FIG. 4 is an MTF analytical graph at a low temperature of-30 ℃ in accordance with the present invention;
FIG. 5 is a field curvature diagram of an embodiment of the present invention;
FIG. 6 is a distortion diagram of an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings of the specification:
as shown in fig. 1, an ultra-large wide-angle high/low temperature resistant optical monitoring system includes: the optical lens assembly comprises a first lens E1 with negative focal power, a second lens E2 with negative focal power, a third lens E3 with negative focal power, a fourth lens E4 with positive focal power, a diaphragm ST, a fifth lens E5 with negative focal power, a sixth lens E6 with positive focal power, a seventh lens E7 with positive focal power and a filter E8, wherein the first lens E1 with negative focal power is a glass lens, the surface facing the object side is a convex surface, the second lens E2 with negative focal power is a glass lens, the convex surface faces the object side, the third lens E3 with negative focal power is a plastic aspheric lens, the convex surface faces the object side, the fourth lens E4 with positive focal power is a double convex glass lens, the fifth lens E5 with negative focal power is a double concave glass lens, and the sixth lens E6 with positive focal power is a double convex glass lens, the seventh lens element E7 with positive refractive power is a biconvex plastic aspheric lens element.
As shown in fig. 1, the effective focal length of the first lens E1 with negative optical power is f1, the effective focal length of the second lens E2 with negative optical power is f2, the ratio of f1 to f2 is in the range of 1.5< f1/f2<1.8, and the refractive index of the third lens E3 with negative optical power is greater than 1.45 and less than 1.65.
As shown in fig. 1, the effective focal length of the third lens E3 with negative power is f3, the effective focal length of the fourth lens E4 with positive power is f4, the effective focal length of the fifth lens E5 with negative power is f5, the first lens E1 with negative power, the second lens E2 with negative power, the third lens E3 with negative power, the fourth lens E4 with positive power, the stop ST, the fifth lens E5 with negative power, the sixth lens E6 with positive power, the seventh lens E7 with positive power, the overall effective focal length of the filter E8 is f, the ratio range of f1 to f4 is-4.5 < f1/f4 < -2.5, the ratio range of f3 to f2 is 0.5 < f 2/f 56 < 1.5< f1/f4 < -2.5, and the ratio range of f3 to f2 is 0.5 < f 2/f 868 < f 6951.7.f 3.7.
As shown in fig. 1, the total length of the whole of the first lens E1 having negative optical power, the second lens E2 having negative optical power, the third lens E3 having negative optical power, the fourth lens E4 having positive optical power, the stop ST, the fifth lens E5 having negative optical power, the sixth lens E6 having positive optical power, the seventh lens E7 having positive optical power, and the filter E8 is less than 20 mm.
As shown in fig. 1, the fifth lens E5 having negative power has a refractive index greater than 1.85.
As shown in fig. 1, the refractive indexes of the fourth lens E4 having positive power and the sixth lens E6 having positive power are both greater than 1.75.
The specific implementation parameters are as follows:
the parameters of an ultra-large wide-angle high-low temperature resistant optical monitoring system are listed in the following table 1 and table 2. It should be noted that the data listed in the following tables I and II are not intended to limit the present invention, and those skilled in the art can make appropriate changes to the parameters or settings of the present invention without departing from the scope of the present invention.
In the first table, the effective focal length of the optical system is 1.75mm, the aperture value is 2.0, the total length of the optical system is 19.9978mm, the full field angle is 220 °, Surf is the surface number, Type is the surface Type, Radius is the Radius of curvature, Thickness is the lens Thickness, Index is the refractive Index, ABB is the ABB, and EFL-E is the focal length.
Watch 1
Surf1, Surf2 correspond to both surfaces of a first lens E1 having negative optical power, Surf3, Surf4 correspond to both surfaces of a second lens E2 having negative optical power, Surf5, Surf6 correspond to both surfaces of a third lens E3 having negative optical power, Surf7, Surf8 correspond to both surfaces of a fourth lens E4 having positive optical power, SurfSTO is a diaphragm device ST surface, Surf10, Surf11 correspond to both surfaces of a fifth lens E5 having negative optical power, Surf12, Surf13 correspond to both surfaces of a sixth lens E6 having positive optical power, Surf13, Surf14 correspond to both surfaces of a seventh lens E7 having positive optical power, and Surf15, Surf16 correspond to both surfaces of an E filter E8.
All the optical lenses used belong to plastic aspheric lenses, and the aspheric data are as follows:
watch two
Fig. 2, 3 and 4 show graphs of Modulation Transfer Function (MTF) at normal temperature of 25 deg.c, high temperature of 80 deg.c and low temperature of-30 deg.c, respectively, representing the integrated resolving power of the optical system, where the horizontal axis shows spatial frequency, unit: the number of turns per millimeter (cycles/mm), the longitudinal axis represents the numerical value of a Modulation Transfer Function (MTF), the numerical value of the MTF is used for evaluating the imaging quality of a lens, the value range is 0-1, particularly, the optical transfer function is used for evaluating the imaging quality of an optical system in a more accurate, visual and common mode, the higher and smoother the curve is, the better the imaging quality of the system is, and the stronger the restoring capability to a real image is; as can be seen from fig. 2, when the spatial frequency of the visible light band at the normal temperature of 25 ℃ is 200lp/mm, the MTF of the imaging area near the center is greater than 0.5, the imaging quality is very good, and the optical lens provided by the specific implementation mode corrects various aberrations, such as spherical aberration, coma aberration, astigmatism, field curvature, chromatic aberration of magnification, chromatic aberration of position, and the like, so that the resolution is improved; as can be seen from fig. 3 and 4, MTF at high and low temperatures satisfies high resolution, and high and low temperature resolution is good; FIG. 5 and FIG. 6 show the field curvature diagram and the distortion diagram, respectively, and it can be seen from FIG. 5 that the field curvature value is controlled between-0.1 mm and 0.1mm, and the smaller the field curvature value is, the better the imaging quality of the lens is; it can be known from fig. 6 that the distortion is controlled within-2% to 3%, and the smaller the distortion value, the better the imaging effect of the lens.
The third lens and the seventh lens are plastic lenses, and the other five lenses are glass lenses, so that the optical monitoring system formed by the lenses with specific structural shapes and distributed reasonably in optical power can achieve high resolution under a compact framework; in addition, the number of the lenses is only 7, so that the structure is simple, the cost is reduced, and the research and development period is shortened; the optical lens system provided by the invention has better matching of parameters such as the structural shape, the refractive index of the lens material and the like and imaging conditions, so that the spherical aberration, the coma aberration, the astigmatism, the field curvature, the magnification chromatic aberration and the position chromatic aberration of the lens system are well corrected, the uniform imaging on the whole image surface is ensured, the use requirement of high pixels is met, and the optical lens system has the advantages of compact structure, small appearance size, increased field angle and high and low temperature resistance.
It should be noted that the above list is only one specific embodiment of the present invention. It is clear that the invention is not limited to the embodiments described above, but that many variations are possible, all of which can be derived or suggested directly from the disclosure of the invention by a person skilled in the art, and are considered to be within the scope of the invention.
Claims (7)
1. The utility model provides a resistant high low temperature optical monitoring system of super large wide angle which characterized in that includes: a first lens (E1) with negative focal power, a second lens (E2) with negative focal power, a third lens (E3) with negative focal power, a fourth lens (E4) with positive focal power, a diaphragm (ST), a fifth lens (E5) with negative focal power, a sixth lens (E6) with positive focal power, a seventh lens (E7) with positive focal power and an optical filter (E8), wherein the first lens (E1) with negative focal power is a glass lens, the surface of the first lens facing the object side is a convex surface, the second lens (E2) with negative focal power is a glass lens, the convex surface of the second lens faces the object side, the third lens (E3) with negative focal power is a plastic lens, the convex surface of the third lens faces the object side, the fourth lens (E4) with positive focal power is a double convex glass lens, and the fifth lens (E5) with negative focal power is a double concave glass lens, the sixth lens (E6) with positive focal power is a biconvex glass lens, and the seventh lens (E7) with positive focal power is a biconvex plastic aspheric lens.
2. An ultra-large wide-angle high and low temperature resistant optical monitoring system as claimed in claim 1, wherein the first lens (E1) with negative power has an effective focal length f1, the second lens (E2) with negative power has an effective focal length f2, and the ratio of f1 to f2 is 1.5< f1/f2< 1.8.
3. An ultra-large wide angle high and low temperature tolerant optical monitoring system as claimed in claim 1, wherein said third lens (E3) with negative power has a refractive index greater than 1.45 and less than 1.65.
4. The ultra-large wide-angle high and low temperature resistant optical monitoring system according to claim 2, wherein the third lens (E3) with negative power has an effective focal length f3, the fourth lens (E4) with positive power has an effective focal length f4, the fifth lens (E5) with negative power has an effective focal length f5, the first lens (E1) with negative power, the second lens (E2) with negative power, the third lens (E3) with negative power, the fourth lens (E4) with positive power, a diaphragm (ST), the fifth lens (E5) with negative power, the sixth lens (E6) with positive power, the seventh lens (E7) with positive power, the total effective focal length of the optical filter (E8) is f, the ratio of f1 to f4 is in the range of-4.5 < f 1/45/f 5< 5 f 465/5 f 5/5 f < 5.465 f 5/5 f 5< 5 f 465/2 f 5/5 f 5/5738, the ratio of f5 to f is in the range of-2.1 < f5/f < -0.7.
5. An ultra-large wide-angle high and low temperature resistant optical monitoring system according to claim 1, characterized in that the total length of the first lens (E1) with negative optical power, the second lens (E2) with negative optical power, the third lens (E3) with negative optical power, the fourth lens (E4) with positive optical power, the diaphragm (ST), the fifth lens (E5) with negative optical power, the sixth lens (E6) with positive optical power, the seventh lens (E7) with positive optical power, and the optical filter (E8) is less than 20 mm.
6. An ultra-large wide angle high and low temperature tolerant optical monitoring system as claimed in claim 1, wherein the refractive index of said negative fifth lens (E5) is greater than 1.85.
7. An ultra-large wide-angle high and low temperature tolerant optical monitoring system as claimed in claim 1, wherein the refractive index of the fourth lens (E4) with positive optical power and the refractive index of the sixth lens (E6) with positive optical power are both greater than 1.75.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011433305.3A CN112415720A (en) | 2020-12-10 | 2020-12-10 | Super-large wide-angle high-low temperature resistant optical monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011433305.3A CN112415720A (en) | 2020-12-10 | 2020-12-10 | Super-large wide-angle high-low temperature resistant optical monitoring system |
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| CN112415720A true CN112415720A (en) | 2021-02-26 |
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| CN202011433305.3A Withdrawn CN112415720A (en) | 2020-12-10 | 2020-12-10 | Super-large wide-angle high-low temperature resistant optical monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114578517A (en) * | 2022-03-14 | 2022-06-03 | 江西特莱斯光学有限公司 | Ultrashort large-target-surface TOF optical lens |
-
2020
- 2020-12-10 CN CN202011433305.3A patent/CN112415720A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114578517A (en) * | 2022-03-14 | 2022-06-03 | 江西特莱斯光学有限公司 | Ultrashort large-target-surface TOF optical lens |
| CN114578517B (en) * | 2022-03-14 | 2024-01-02 | 江西特莱斯光学有限公司 | Ultra-short large target surface TOF optical lens |
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Application publication date: 20210226 |
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