CN117518431A - Large aperture day and night confocal An Fangbian focus lens and imaging method thereof - Google Patents
Large aperture day and night confocal An Fangbian focus lens and imaging method thereof Download PDFInfo
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- CN117518431A CN117518431A CN202311297484.6A CN202311297484A CN117518431A CN 117518431 A CN117518431 A CN 117518431A CN 202311297484 A CN202311297484 A CN 202311297484A CN 117518431 A CN117518431 A CN 117518431A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 238000012634 optical imaging Methods 0.000 claims abstract description 11
- 239000011521 glass Substances 0.000 claims description 8
- 230000005499 meniscus Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000004075 alteration Effects 0.000 abstract description 11
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000001228 spectrum Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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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
- G02B15/142—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 having two groups only
- G02B15/1425—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 having two groups only the first group being negative
-
- 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
-
- 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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- 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
- G02B15/177—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 negative front lens or group of lenses
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- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
The invention relates to a large aperture day-night confocal An Fangbian focal lens which comprises a zoom optical imaging system, wherein the zoom optical imaging system comprises a compensation group and a magnification-varying group which are sequentially arranged from left to right along a light incidence light path, the compensation group has negative focal power, the magnification-varying group has positive focal power, the compensation group comprises a first lens, a second lens and a third lens which are sequentially arranged from left to right along the light incidence light path, and the magnification-varying group comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along the light incidence light path. The invention realizes the optical characteristics of wide spectrum, large relative aperture, miniaturization, high image quality, day-night confocal monitoring and the like of the optical system through reasonable lens collocation, simultaneously well corrects the on-axis and off-axis aberration, and has better imaging quality.
Description
Technical Field
The invention relates to a large aperture day-night confocal An Fangbian focus lens and an imaging method thereof.
Background
At present, the working wavelength of many common security monitoring lenses in the market is visible light and near infrared light, however, the type of lenses only consider the chromatic aberration of the visible light wave band, only correct the chromatic aberration of the visible light wave band, and not correct the chromatic aberration of the visible light and infrared light, thus leading to the separation of the visible light image plane and the infrared light image plane. The working principle of the system is that all-weather monitoring in the daytime and at night is realized through the switching of the optical filters, color images are obtained in the daytime, black-and-white images are obtained at night, the effect of shooting images in a low-illumination environment is poorer, and images which contain detail and have color effects are difficult to obtain.
Because the aperture has a direct connection with the light entering amount of the system, the size of the imaging light beam can be limited by controlling the size of the aperture, and the larger the aperture is, the larger the imaging light beam is, the more the light entering amount of the system is, and vice versa. So to enhance the recognition of image effects in low-light and night environments, this can be achieved by large aperture techniques.
Disclosure of Invention
The invention improves the problems, namely the technical problem to be solved by the invention is to provide a large aperture day-night confocal An Fangbian focal lens and an imaging method thereof, which have the optical characteristics of wide spectrum, large relative aperture, miniaturization, high image quality, day-night confocal monitoring and the like.
The invention is constituted by comprising a zoom optical imaging system which comprises a compensation group and a magnification-varying group which are sequentially arranged from left to right along a light incidence light path, wherein the compensation group has negative focal power, the magnification-varying group has positive focal power, the compensation group comprises a first lens, a second lens and a third lens which are sequentially arranged from left to right along the light incidence light path, and the magnification-varying group comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along the light incidence light path.
Further, the air space between the first lens and the second lens is: 4.5-5.0 mm; the air interval between the second lens and the third lens is as follows: 0.1 to 0.5mm; the air space between the fourth lens and the fifth lens is: 0.1 to 0.5mm; the air interval between the fifth lens and the sixth lens is as follows: 0.1 to 0.5mm; the air interval between the sixth lens and the seventh lens is as follows: 0.5 to 1.0mm.
Further, the focal length of the zoom optical imaging system isThe focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are respectively +.>Wherein->And->The following proportions are satisfied:。
further, the first lens satisfies the relation: n is more than or equal to 1.7 d ≤2.0，V d Less than or equal to 50.0; the second lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d More than or equal to 50.0; the third lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d Less than or equal to 50.0; the fourth lens satisfies the relation: n is more than or equal to 1.2 d ≤1.5，V d More than or equal to 50.0; the fifth lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d More than or equal to 50.0; the sixth lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d Less than or equal to 50.0; the seventh lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d More than or equal to 50.0; wherein N is d Is of refractive index, V d Is an abbe constant.
Further, the first lens and the fourth lens are glass spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are plastic aspherical lenses.
Further, the second, third, fifth, sixth and seventh lenses are all aspheric lenses. The aspherical curve equation expression is:
；
wherein Z is the altitude of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant;are all high order term coefficients.
Further, a diaphragm is arranged between the compensation group and the zoom group, and an optical filter is arranged at the rear side of the zoom group.
Further, in the imaging method of the large aperture day-night confocal An Fangbian focus lens, light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens from left to right and then are imaged.
Compared with the prior art, the invention has the following beneficial effects:
1. the imaging angle of the wide-angle end of the lens to an object is larger than 130 degrees, and the wide-angle end and the telescopic end have the advantages of higher imaging definition, large aperture, lower tolerance sensitivity, better high-low temperature stability and the like, and can monitor more comprehensively;
2. by reasonably matching each optical lens, the system has compact and reasonable structure, easy assembly and low tolerance sensitivity, and is more suitable for large-scale high-yield production;
3. the two glass lenses are matched with five plastic lenses for use, so that the system has lighter system quality compared with a full glass system, has stronger optical performance stability compared with the full plastic system, and reduces the cost while adapting to the environment;
4. the zoom design is adopted, and the zoom type wide-angle high-image quality monitoring capability is realized at the same time;
5. the F number at the wide-angle end is smaller, the light transmission caliber is larger, the sufficient light quantity of the system is ensured, and the system can adapt to various complex environments;
6. the displacement of the focusing surface can be well compensated at high temperature and low temperature, and the complex environment adaptability is realized;
7. the axial chromatic aberration, vertical chromatic aberration and high-order chromatic aberration are corrected, and the imaging system can have higher imaging quality at a large angle.
Drawings
FIG. 1 is a schematic view of an optical structure of a wide-angle end according to an embodiment of the present invention;
FIG. 2 is an axial chromatic aberration diagram at the wide-angle end of an embodiment of the invention;
FIG. 3 is a vertical chromatic aberration diagram at the wide-angle end of an embodiment of the invention;
FIG. 4 is a graph of field curvature distortion at the wide-angle end of an embodiment of the present invention;
FIG. 5 is an axial chromatic aberration diagram of the telephoto end according to the embodiment of the present invention;
FIG. 6 is a vertical axis color difference chart of the telescope end according to the embodiment of the present invention;
FIG. 7 is a graph of field curvature distortion at the telephoto end in accordance with an embodiment of the present invention;
in the figure: STO-diaphragm; l1-a first lens; l2-a second lens; l3-a third lens; l4-fourth lens; l5-fifth lens; l6-sixth lens; l7-seventh lens; l8-equivalent glass plate; IMA-imaging plane.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Example 1: as shown in fig. 1 to 7, in the present embodiment, a large aperture day-night confocal An Fangbian focus lens is provided, which includes a zoom optical imaging system including a compensation group and a magnification-varying group sequentially disposed from left to right along a light incident light path, wherein the compensation group has negative optical power, the magnification-varying group has positive optical power, the compensation group is composed of a first lens L1, a second lens L2, and a third lens L3 sequentially disposed from left to right along the light incident light path, and the magnification-varying group is composed of a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 sequentially disposed from left to right along the light incident light path; the first lens and the second lens are lenses with negative focal power, and adjust large-angle light rays, wherein the plastic aspheric surface also has the function of reducing distortion of an optical system.
An equivalent glass plate L8 is provided behind the seventh lens.
The zoom optical imaging system described above is made of glass and plastic materials.
The first lens is a meniscus concave-convex lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the second lens is a biconcave negative lens, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface;
the third lens is a biconvex positive lens, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
the fourth lens is a biconvex positive lens, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens is a biconvex positive lens, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens is a biconcave negative lens, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface;
the seventh lens is a meniscus positive lens, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface.
In this embodiment, the air space between the first lens and the second lens is: 4.5-5.0 mm; the air interval between the second lens and the third lens is as follows: 0.1 to 0.5mm; the air space between the fourth lens and the fifth lens is: 0.1 to 0.5mm; the air interval between the fifth lens and the sixth lens is as follows: 0.1 to 0.5mm; the air interval between the sixth lens and the seventh lens is as follows: 0.5 to 1.0mm; under the condition that the lens meets the imaging requirement, the distance between the lenses is reduced, and the total optical length of the lens is facilitated.
In the present embodiment, the focal length of the zoom optical imaging system isThe focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are respectively +.>Wherein->And->The following proportions are satisfied:。
in the present embodiment, the first lens satisfies the relation: n is more than or equal to 1.7 d ≤2.0，V d Less than or equal to 50.0; the second lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d More than or equal to 50.0; the third lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d Less than or equal to 50.0; the fourth lens satisfies the relation: n is more than or equal to 1.2 d ≤1.5，V d More than or equal to 50.0; the fifth lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d More than or equal to 50.0; the sixth lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d Less than or equal to 50.0; the seventh lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d More than or equal to 50.0; wherein N is d Is of refractive index, V d Is an abbe constant.
In this embodiment, the first lens element and the fourth lens element are spherical glass lens elements, and the second lens element, the third lens element, the fifth lens element, the sixth lens element and the seventh lens element are aspherical plastic lens elements.
In this embodiment, the second, third, fifth, sixth and seventh lenses are aspheric lenses. The aspherical curve equation expression is:
；
wherein Z is the altitude of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant;are all high order term coefficients.
In this embodiment, a diaphragm is disposed between the compensation group and the zoom group, and an optical filter is disposed at the rear side of the zoom group.
In this embodiment, at the time of imaging: the light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens from left to right and then are imaged.
Example 2: on the basis of embodiment 1, in this embodiment, the technical indexes of the optical system implementation of the zoom optical imaging system are as follows:
(1) Focal length: EFFL is more than or equal to 4.0 and less than or equal to 5.0mm;
(2) F is less than or equal to 1.5;
(3) Angle of view: 2w is more than or equal to 130 degrees;
(4) Working wave band: visible light and 850nm short wave infrared band.
To achieve the above design parameters, in this embodiment, specific design parameters of each lens used in the optical system are shown in table 1 below:
TABLE 1
The aspherical coefficients of the respective aspherical lenses of the optical system of the present embodiment are as follows table 2:
TABLE 2
The values of the air layer thicknesses between the compensation group and the magnification-varying group when the present embodiment is changed from the wide-angle end to the telephoto end are shown in table 3 below:
TABLE 3 Table 3
The embodiment enables the optical system to realize zoom, wide angle, large aperture, day and night confocal and low temperature drift design through reasonable lens collocation, and meanwhile, on-axis and off-axis aberration is well corrected, and good imaging quality is achieved, as shown in fig. 2 to 4.
Any of the above-described embodiments of the present invention disclosed herein, unless otherwise stated, if they disclose a numerical range, then the disclosed numerical range is the preferred numerical range, as will be appreciated by those of skill in the art: the preferred numerical ranges are merely those of the many possible numerical values where technical effects are more pronounced or representative. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the invention, and the numerical values listed above should not limit the protection scope of the invention.
Meanwhile, if the above invention discloses or relates to parts or structural members fixedly connected with each other, the fixed connection may be understood as follows unless otherwise stated: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
If the terms "first," "second," etc. are used herein to define a part, those skilled in the art will recognize that: the use of "first" and "second" is used merely to facilitate distinguishing between components and not otherwise stated, and does not have a special meaning.
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (9)
1. The large aperture day-night confocal security zoom lens is characterized by comprising a zoom optical imaging system, wherein the zoom optical imaging system comprises a compensation group and a zoom group which are sequentially arranged from left to right along a light incidence light path, the compensation group has negative focal power, the zoom group has positive focal power, the compensation group comprises a first lens, a second lens and a third lens which are sequentially arranged from left to right along the light incidence light path, and the zoom group comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along the light incidence light path.
2. The large aperture day and night confocal security zoom lens of claim 1, wherein an air space between the first lens and the second lens is: 4.5-5.0 mm; the air interval between the second lens and the third lens is as follows: 0.1 to 0.5mm; the air space between the fourth lens and the fifth lens is: 0.1 to 0.5mm; the air interval between the fifth lens and the sixth lens is as follows: 0.1 to 0.5mm; the air interval between the sixth lens and the seventh lens is as follows: 0.5 to 1.0mm.
3. The large aperture day and night confocal security zoom lens of claim 1, wherein the focal length of the zoom optical imaging system isThe focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are respectively +.>Wherein->And->The following proportions are satisfied: />。
4. The large aperture day-night confocal security zoom lens of claim 1, wherein the first lens satisfies the relationship: n is more than or equal to 1.7 d ≤2.0，V d Less than or equal to 50.0; the second lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d More than or equal to 50.0; the third lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d Less than or equal to 50.0; the fourth lens satisfies the relation: n is more than or equal to 1.2 d ≤1.5，V d More than or equal to 50.0; the fifth lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d More than or equal to 50.0; the sixth lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d Less than or equal to 50.0; the seventh lens satisfies the relation: n is more than or equal to 1.5 d ≤1.8，V d More than or equal to 50.0; wherein N is d Is of refractive index, V d Is AbbeA constant.
5. The large aperture day and night confocal security zoom lens of claim 1, wherein the first lens and the fourth lens are glass spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are plastic aspherical lenses.
6. The large aperture day and night confocal security zoom lens of claim 1, wherein the second, third, fifth, sixth and seventh lenses are aspheric lenses; the aspherical curve equation expression is:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein Z is the altitude of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant; />Are all high order term coefficients.
7. The large aperture day and night confocal security zoom lens of claim 1, wherein a diaphragm is arranged between the compensation group and the zoom group, and a filter is arranged at the rear side of the zoom group.
8. The large aperture day and night confocal security zoom lens of claim 1, wherein the first lens is a meniscus concave-negative lens, the object side surface is a convex surface, and the image side surface is a concave surface; the second lens is a biconcave negative lens, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the third lens is a biconvex positive lens, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens is a biconvex positive lens, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens is a biconvex positive lens, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens is a biconcave negative lens, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the seventh lens is a meniscus positive lens, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface.
9. An imaging method of a large aperture day-night confocal An Fangbian focus lens according to any one of claims 1-8, wherein light rays sequentially pass through a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from left to right and then are imaged.
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