CN108845402B - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN108845402B CN108845402B CN201810649185.7A CN201810649185A CN108845402B CN 108845402 B CN108845402 B CN 108845402B CN 201810649185 A CN201810649185 A CN 201810649185A CN 108845402 B CN108845402 B CN 108845402B
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- lens
- biconvex
- negative meniscus
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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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
Abstract
The invention provides an optical lens, an optical system of which comprises a front lens group, a diaphragm and a rear lens group, wherein the front lens group, the diaphragm and the rear lens group have negative focal power and positive focal power, the front lens group comprises a first negative meniscus lens, a second negative meniscus lens, a first biconcave lens, a first biconvex lens and a third negative meniscus lens, and the first negative meniscus lens, the second negative meniscus lens, the first biconcave lens and the third negative meniscus lens are sequentially arranged from an object side surface to an image side surface; the rear lens group comprises a positive meniscus lens, a second biconvex lens, a second biconcave lens, a third biconvex lens, a third biconcave lens, a fourth biconvex lens, a fifth biconvex lens and a fourth negative meniscus lens which are arranged in sequence from the object side to the image side, and the second biconvex lens, the second biconcave lens and the third biconvex lens are sequentially sealed and cemented to form a second cemented lens group. The optical lens has high resolution and low distortion, is suitable for monitoring a remote target, and effectively improves the imaging definition and authenticity.
Description
Technical Field
The invention relates to the field of imaging lenses, in particular to an optical lens with large relative aperture, high resolution, high transmittance and low distortion.
Background
The television monitoring camera lens has been used for the appearance and popularization of the television monitoring camera lens for nearly 30 years, and the television monitoring camera lens has a plurality of specifications according to the use wave band, the shooting definition and the size of a camera target surface, namely the interface division. The visible light and near infrared monitoring camera lens has high monitoring utilization rate for personnel and environment under day and night, most ultraviolet band monitoring camera lenses used for special attention objects (such as high-voltage arc light monitoring, high-voltage leakage monitoring and high-voltage discharge monitoring) have low performance indexes and low imaging resolution, high-resolution images cannot be obtained under remote monitoring, and the reducibility of actual shooting target details is poor; the image distortion is large, the difference between the image distortion and an actual shooting target is large, and the authenticity is difficult to guarantee.
Under the condition of remote monitoring, various optical lenses in the prior art cannot achieve the performance indexes of high imaging resolution, high detail reducibility, small image distortion and image authenticity guarantee.
Disclosure of Invention
The present invention is directed to solve at least one of the above problems and to provide an optical lens having low distortion and high resolution, which can achieve high detail reducibility and ensure image authenticity.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an optical lens, wherein an optical system of the optical lens comprises a front lens group with negative focal power, a diaphragm and a rear lens group with positive focal power, which are sequentially arranged from an object side surface to an image side surface, the front lens group comprises a first negative meniscus lens, a second negative meniscus lens, a first biconcave lens, a first biconvex lens and a third negative meniscus lens, which are sequentially arranged from the object side surface to the image side surface, and the first biconvex lens and the third negative meniscus lens are closely jointed to form a first cemented lens group; the rear lens group comprises a positive meniscus lens, a second biconvex lens, a second biconcave lens, a third biconvex lens, a third biconcave lens, a fourth biconvex lens, a fifth biconvex lens and a fourth negative meniscus lens which are sequentially arranged from the object side to the image side, and the second biconvex lens, the second biconcave lens and the third biconvex lens are sequentially sealed and cemented to form a second cemented lens group.
In some embodiments, the first negative meniscus lens, the second negative meniscus lens, the first biconcave lens, the first biconvex lens, the third negative meniscus lens, the positive meniscus lens, the second biconvex lens, the second biconcave lens, the third biconvex lens, the third biconcave lens, the fourth biconvex lens, the fifth biconvex lens, and the fourth negative meniscus lens are all spherical lenses.
In some embodiments, the first cemented lens group and the fourth biconvex lens are each a drum lens.
In some embodiments, the front lens group has a focal length of 35.30mm to 52.94mm and the rear lens group has a focal length of 11.83mm to 17.75 mm.
In some embodiments, the air separation between the front lens group and the rear lens group is 14.29mm to 21.43 mm.
In some embodiments, the air separation of the first negative meniscus lens and the second negative meniscus lens is 5.22mm to 7.82mm, the air separation of the second negative meniscus lens and the first biconcave lens is 4.63mm to 6.95mm, and the air separation of the first biconcave lens and the first cemented lens group is 3.18mm to 4.78 mm.
In some embodiments, the positive meniscus lens and the second cemented lens group have an air space of 0.08mm to 0.12mm, the third biconvex lens and the third biconcave lens have an air space of 0.55 to 0.83mm, the third biconcave lens and the fourth biconvex lens have an air space of 0.08mm to 0.12mm, the fourth biconvex lens and the fifth biconvex lens have an air space of 0.08mm to 0.12mm, and the fifth biconvex lens and the fourth negative meniscus lens have an air space of 0.82mm to 1.22 mm.
In some embodiments, the optical transfer function of the optical lens is greater than 0.5 at 1601p/mm at 28 ° of half field of view.
The invention has the beneficial effects that: according to the optical lens provided by the invention, through the arrangement of the first negative meniscus lens, the second negative meniscus lens and the third negative meniscus lens, the light rays with large incident angles are contracted, the aperture of the light beam entering the diaphragm is reduced, the lens is enabled to obtain good aberration correction, the included angle between the chief rays of the marginal field and the optical axis is reduced, and the uniformity of the illumination of the image surface is good; meanwhile, the rear lens group provided by the invention can realize the purposes of low distortion and high resolution, is suitable for monitoring a special target which is far away and is not easy to be touched by people, effectively improves the imaging definition of the monitored target, effectively restores the image authenticity, and overcomes the defect of low performance index of the ultraviolet monitoring camera in the prior art.
Drawings
Fig. 1 is a schematic diagram of an optical system of an optical lens according to an embodiment of the present invention.
FIG. 2 is a diagram of the optical transfer function of the optical system of the optical lens according to an embodiment of the present invention.
Fig. 3 is a field curvature diagram of an optical system of an optical lens in an embodiment of the present invention.
Fig. 4 is a distortion diagram of an optical system of an optical lens according to an embodiment of the present invention.
Reference numerals:
a front lens group 10; a rear lens group 20; a first negative meniscus lens 31; a second negative meniscus lens 32; a third negative meniscus lens 33; a fourth negative meniscus lens 34; a first biconcave lens 41; a second biconcave lens 42; a third biconcave lens 43; a first biconvex lens 51; a second biconvex lens 52; a third biconvex lens 53; a fourth lenticular lens 54; a fifth lenticular lens 55; a positive meniscus lens 60; an image plane 70; an aperture 80.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following describes an optical lens provided by the present invention in detail with reference to fig. 1.
As shown in fig. 1, the present invention provides an optical lens comprising a front lens group 10 having negative optical power, a stop 80 and a rear lens group 20 having positive optical power, which are arranged in order from an object side surface to an image side surface, the front lens group 10 comprising a first negative meniscus lens 31, a second negative meniscus lens 32, a first biconcave lens 41, a first biconvex lens 51 and a third negative meniscus lens 33, which are arranged in order from the object side surface to the image side surface, the first biconvex lens 51 and the third negative meniscus lens 33 being cemented in close contact to form a first cemented lens group; the rear lens group 20 includes a positive meniscus lens 60, a second biconvex lens 52, a second biconcave lens 42, a third biconvex lens 53, a third biconcave lens 43, a fourth biconvex lens 54, a fifth biconvex lens 55, and a fourth negative meniscus lens 34, which are arranged in this order from the object side to the image side, and the second biconvex lens 52, the second biconcave lens 42, and the third biconvex lens 53 are closely cemented in order to form a second cemented lens group.
The optical lens provided by the invention is also provided with an image surface 70 at one side of the rear lens group.
According to the optical lens provided by the invention, through the arrangement of the first negative meniscus lens 31, the second negative meniscus lens 32 and the third negative meniscus lens 33 (especially when the first negative meniscus lens 31, the second negative meniscus lens 32 and the third negative meniscus lens 33 made of high-refractive-index materials are used), the light rays with large incident angles are contracted, the aperture of the light beam entering the diaphragm 80 is reduced, the lens obtains good aberration correction, the included angle between the chief ray of the marginal field and the optical axis is reduced, and the uniformity of the illumination of the image surface 70 is good; meanwhile, the rear lens group 20 provided by the invention can realize the purposes of low distortion and high resolution, so as to be suitable for monitoring a special target which is far away and is not easy to be touched by people, effectively improve the imaging definition of the monitored target, effectively restore the image authenticity and overcome the defect of low performance index of the ultraviolet monitoring camera in the prior art.
The optical lens provided by the invention can be used for preparing a high-resolution and low-distortion ultraviolet monitoring camera lens, such as a full-spherical ultraviolet monitoring camera lens. In the present invention, the direction from the object side to the image side is the incident direction of the light from left to right in fig. 1.
In one embodiment of the present invention, the first negative meniscus lens 31, the second negative meniscus lens 32, the first biconcave lens 41, the first biconvex lens 51, the third negative meniscus lens 33, the positive meniscus lens 60, the second biconvex lens 52, the second biconcave lens 42, the third biconvex lens 53, the third biconcave lens 43, the fourth biconvex lens 54, the fifth biconvex lens 55, and the fourth negative meniscus lens 34 are all spherical lenses; preferably, the spherical lens is a spherical glass lens having a high transmittance. In the invention, no aspheric surface and diffraction surface are adopted, thus the processing and detection cost of parts is well controlled, and the batch production, popularization and application of the optical lens are ensured.
In one embodiment of the present invention, the first cemented lens group and the fourth biconvex lens 54 are each a drum lens. The aberration of the optical system is effectively corrected, and when a pixel size of 3 mu m is used, the resolution of more than 400 ten thousand pixels can be realized.
In one embodiment of the present invention, the focal length of the front lens group 10 is 35.30mm to 52.94mm, and the focal length of the rear lens group 20 is 11.83mm to 17.75 mm. The optical lens provided by the invention adopts a negative and positive focal power separated anti-telephoto imaging objective structure, the focal lengths of the front lens group 10 and the rear lens group 20 are selected, and the rear principal point moves backwards, so that the clear aperture of the rear lens group 20 is reduced and unified, and the optical lens is convenient for batch straight-tube assembly.
In one embodiment of the present invention, the air space between the front lens group 10 and the rear lens group 20 is 14.29mm to 21.43 mm. The air space between the front lens group and the rear lens group is properly increased, so that the assembly and the disassembly between the front lens group and the rear lens group are more convenient.
In one embodiment of the present invention, the air space between the first negative meniscus lens 31 and the second negative meniscus lens 32 is 5.22mm to 7.82mm, the air space between the second negative meniscus lens 32 and the first biconcave lens 41 is 4.63mm to 6.95mm, and the air space between the first biconcave lens 41 and the first cemented lens group is 3.18mm to 4.78 mm. The selection of the range of the air interval is beneficial to the phase difference balance of the optical system and the shortening of the length of the optical system.
In an embodiment of the present invention, an air interval between the positive meniscus lens 60 and the second cemented lens group is 0.08mm to 0.12mm, an air interval between the third biconvex lens 53 and the third biconcave lens 43 is 0.55 to 0.83mm, an air interval between the third biconvex lens 43 and the fourth biconvex lens 54 is 0.08mm to 0.12mm, an air interval between the fourth biconvex lens 54 and the fifth biconvex lens 55 is 0.08mm to 0.12mm, and an air interval between the fifth biconvex lens 55 and the fourth negative meniscus lens 34 is 0.82mm to 1.22 mm.
In one embodiment of the invention, the optical transfer function of the optical lens is more than 0.5 at 1601p/mm under the half field of view of 28 degrees.
In one embodiment of the present invention, as shown in fig. 1, an optical lens is disclosed, comprising a front lens group 10 with negative optical power, a diaphragm 80 and a rear lens group 20 with positive optical power, which are arranged in sequence from an object side surface to an image side surface, wherein the front lens group 10 comprises a first negative meniscus lens 31, a second negative meniscus lens 32, a first biconcave lens 41, a first biconvex lens 51 and a third negative meniscus lens 33, which are arranged in sequence from the object side surface to the image side surface, and the first biconvex lens 51 and the third negative meniscus lens 33 are closely cemented to form a first cemented lens group; the rear lens group 20 includes a positive meniscus lens 60, a second biconvex lens 52, a second biconcave lens 42, a third biconvex lens 53, a third biconcave lens 43, a fourth biconvex lens 54, a fifth biconvex lens 55, and a fourth negative meniscus lens 34, which are arranged in this order from the object side to the image side, and the second biconvex lens 52, the second biconcave lens 42, and the third biconvex lens 53 are closely cemented in order to form a second cemented lens group.
Wherein, the focal length of the front lens group 10 is 44.12mm, and the focal length of the rear lens group 20 is 14.79 mm. The air space of the front lens group 10 and the rear lens group 20 was 17.86 mm.
The air space between the first negative meniscus lens 31 and the second negative meniscus lens 32 is 6.52mm, the air space between the second negative meniscus lens 32 and the first double concave lens 41 is 5.79mm, and the air space between the first double concave lens 41 and the first cemented lens group is 3.98 mm.
The air interval between the positive meniscus lens 60 and the second cemented lens group is 0.1mm, the air interval between the third biconvex lens 53 and the third biconcave lens 43 is 0.69mm, the air interval between the third biconcave lens 43 and the fourth biconvex lens 54 is 0.1mm, the air interval between the fourth biconvex lens 54 and the fifth biconvex lens 55 is 0.1mm, and the air interval between the fifth biconvex lens 55 and the fourth negative meniscus lens 34 is 1.02 mm.
As shown in fig. 2, for the transfer function of the optical lens in the present invention, it can be seen that the MTF of the optical transfer function is greater than 0.5 at 1601p/mm under the half field of view of 28 ° (full field of view of 56 °).
As shown in fig. 3 and 4, the field curvature and the relative distortion value of the optical lens of the present invention are shown, in the field curvature diagram, the vertical axis is the half field angle range, the horizontal axis is the field curvature value, and the field curvature value is less than 0.04 mm; in the relative distortion diagram, the vertical axis is a half-field angle range, the horizontal axis is relative distortion percentage, and the absolute value of the relative distortion does not exceed 2%.
As can be seen from fig. 2, fig. 3 and fig. 4, the aberration of the optical lens is well corrected, the optical transfer function of each field of view is greater than 0.5, and is uniform, the relative distortion is no more than-2%, and the imaging quality requirements of an 1/2-inch detector and 400 ten thousand pixels (2048 × 2048 pixels, 3 μm pixel imaging) can be achieved under the full field angle. The global surface lens element also provides convenience for mass production and reduces the cost.
The optical system in the optical lens provided by the invention achieves the following optical indexes:
1. focal length: f ═ 8 mm;
2. f number of image F is 2;
3. the working wave band is as follows: 240 nm-300 nm;
4. the field angle is 2W more than or equal to 56 degrees (the image space field angle is 2 η more than or equal to 8.8 mm);
5. relative distortion: less than-2 percent;
6. optical transfer function MTF:＞0.5@160lp/mm。
in the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (8)
1. An optical lens is characterized in that an optical system of the optical lens comprises a front lens group with negative focal power, a diaphragm and a rear lens group with positive focal power, which are sequentially arranged from an object side surface to an image side surface, wherein the front lens group comprises a first negative meniscus lens, a second negative meniscus lens, a first biconcave lens, a first biconvex lens and a third negative meniscus lens, which are sequentially arranged from the object side surface to the image side surface, and the first biconvex lens and the third negative meniscus lens are closely jointed to form a first cemented lens group; the rear lens group comprises a positive meniscus lens, a second biconvex lens, a second biconcave lens, a third biconvex lens, a third biconcave lens, a fourth biconvex lens, a fifth biconvex lens and a fourth negative meniscus lens which are sequentially arranged from the object side to the image side, and the second biconvex lens, the second biconcave lens and the third biconvex lens are sequentially sealed and cemented to form a second cemented lens group.
2. The optical lens of claim 1, wherein the first negative meniscus lens, the second negative meniscus lens, the first biconcave lens, the first biconvex lens, the third negative meniscus lens, the positive meniscus lens, the second biconvex lens, the second biconcave lens, the third biconvex lens, the third biconcave lens, the fourth biconvex lens, the fifth biconvex lens, and the fourth negative meniscus lens are all spherical lenses.
3. An optical lens according to claim 1, wherein the first cemented lens group and the fourth biconvex lens are each a drum lens.
4. An optical lens according to claim 1, wherein the focal length of the front lens group is 35.30mm to 52.94mm, and the focal length of the rear lens group is 11.83mm to 17.75 mm.
5. An optical lens barrel according to claim 1, wherein the air space of the front lens group and the rear lens group is 14.29mm-21.43 mm.
6. An optical lens according to claim 1, wherein the air space between the first negative meniscus lens and the second negative meniscus lens is 5.22mm to 7.82mm, the air space between the second negative meniscus lens and the first double concave lens is 4.63mm to 6.95mm, and the air space between the first double concave lens and the first cemented lens group is 3.18mm to 4.78 mm.
7. An optical lens barrel according to claim 1, wherein an air interval of the positive meniscus lens and the second cemented lens group is 0.08mm to 0.12mm, an air interval of the third biconvex lens and the third biconcave lens is 0.55 mm to 0.83mm, an air interval of the third biconvex lens and the fourth biconvex lens is 0.08mm to 0.12mm, an air interval of the fourth biconvex lens and the fifth biconvex lens is 0.08mm to 0.12mm, and an air interval of the fifth biconvex lens and the fourth negative meniscus lens is 0.82mm to 1.22 mm.
8. An optical lens as claimed in claim 1, characterized in that the optical transfer function of the optical lens is greater than 0.5 at 1601p/mm at 28 ° of half field of view.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810649185.7A CN108845402B (en) | 2018-06-22 | 2018-06-22 | Optical lens |
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| CN201810649185.7A CN108845402B (en) | 2018-06-22 | 2018-06-22 | Optical lens |
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| CN108845402A CN108845402A (en) | 2018-11-20 |
| CN108845402B true CN108845402B (en) | 2020-04-10 |
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| JP2014041245A (en) * | 2012-08-22 | 2014-03-06 | Canon Inc | Zoom lens and imaging apparatus having the same |
| JP6303376B2 (en) * | 2012-12-28 | 2018-04-04 | 株式会社リコー | Projection zoom lens and image display device |
| JP6392153B2 (en) * | 2015-03-24 | 2018-09-19 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| WO2016194111A1 (en) * | 2015-06-01 | 2016-12-08 | オリンパス株式会社 | Single-focus optical system and optical device provided with same |
| CN106291887B (en) * | 2016-09-12 | 2021-04-23 | 嘉兴中润光学科技股份有限公司 | Fisheye lens |
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