CN114217416A - Optical lens - Google Patents
Optical lens Download PDFInfo
- Publication number
- CN114217416A CN114217416A CN202111626017.4A CN202111626017A CN114217416A CN 114217416 A CN114217416 A CN 114217416A CN 202111626017 A CN202111626017 A CN 202111626017A CN 114217416 A CN114217416 A CN 114217416A
- Authority
- CN
- China
- Prior art keywords
- lens
- optical
- image
- optical lens
- convex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 141
- 210000001747 pupil Anatomy 0.000 claims abstract description 6
- 238000003384 imaging method Methods 0.000 abstract description 29
- 230000004075 alteration Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000004438 eyesight Effects 0.000 description 3
- 235000013312 flour Nutrition 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000004304 visual acuity Effects 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention discloses an optical lens, which comprises six lenses in total, and the six lenses sequentially comprise the following components from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; the image side surface of the second lens is a concave surface; a third lens having a positive refractive power, both the object-side surface and the image-side surface of the third lens being convex; a fourth lens having a positive refractive power, both the object-side surface and the image-side surface of the fourth lens being convex; a fifth lens element having a negative refractive power, both the object-side surface and the image-side surface of the fifth lens element being concave; and the object side surface and the image side surface of the sixth lens with positive focal power are convex surfaces. The optical lens meets the requirements that IH/EPD is more than 3.0 and less than 3.5, TTL/f is more than 10.0 and less than 11.0; where IH denotes a real image height corresponding to a maximum field angle, EPD denotes an entrance pupil diameter, TTL denotes a total optical length, and f denotes an effective focal length. The optical lens has the characteristics of little ghost image and stray light, high definition, super wide angle, large aperture, large CRA and the like.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
In many trends of portable equipment, monitoring and early warning are key links for realizing intellectualization, and a perfect monitoring system can reduce accidents to a great extent.
For measuring moving objects (including animal and human bodies), a stereoscopic vision system is one of key technologies of computer vision, and obtaining distance information of a spatial three-dimensional scene is also the most basic content in computer vision research. The monitoring and early warning are realized by leading the data of the detection result into the early warning module per se and obtaining the warning instruction through the operation of a computer. Under the condition that the algorithms of the early warning system are greatly different, the accuracy of the obtained optical information plays a decisive influence on the early warning effect.
Therefore, the optical information acquired by the optical lens must be accurate, the information contained in the object and the image plane must be consistent, ghost images and stray light with strong energy cannot be allowed to appear, otherwise, the accuracy of calculation is affected, and the misjudgment of the early warning system is caused; meanwhile, the optical lens is required to have a wide field range, and 360 degrees have no dead angle, otherwise, the optical lens has a monitoring dead angle.
Disclosure of Invention
Therefore, the invention aims to provide an optical lens which has the characteristics of few ghost images and stray light, high definition, ultra-wide angle, large aperture, large CRA and the like, and can meet the use requirements of industries such as monitoring and early warning.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention provides an optical lens, which comprises six lenses in total, and the optical lens sequentially comprises the following components from an object side to an imaging surface:
the first lens with negative focal power has a convex object-side surface and a concave image-side surface;
the image side surface of the second lens is a concave surface;
a third lens having a positive refractive power, both the object-side surface and the image-side surface of the third lens being convex;
a fourth lens having a positive refractive power, both the object-side surface and the image-side surface of the fourth lens being convex;
a fifth lens element having a negative refractive power, both the object-side surface and the image-side surface of the fifth lens element being concave;
a sixth lens element having a positive refractive power, wherein both the object-side surface and the image-side surface are convex;
the real image height IH and the entrance pupil diameter EPD corresponding to the maximum field angle of the optical lens meet the following requirements: IH/EPD is more than 3.0 and less than 3.5;
the total optical length TTL and the effective focal length f of the optical lens meet the following requirements: TTL/f is more than 10.0 and less than 11.0.
In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens satisfies the effective focal length f and the maximum field angle FOV:
in some embodiments, the total optical length TTL of the optical lens and the effective focal length f and the maximum field angle FOV satisfy:
in some embodiments, the chief ray incident angle CRA of the optical lens and the effective focal length f satisfy: 25 °/mm < CRA/f < 35 °/mm.
In some embodiments the effective focal length f1 of the first lens and the center thickness CT1 of the first lens satisfy: -5.5 < f1/CT1 < -2.0.
In some embodiments, the central thickness CT5 of the fifth lens and the central thickness CT6 of the sixth lens satisfy: 0.35 < CT5/CT6 < 0.6.
In some embodiments, the maximum field angle FOV of the optical lens and the true image height IH corresponding to the maximum field angle satisfy: 105 °/mm < FOV/IH < 110 °/mm.
In some embodiments, the total optical length TTL of the optical lens element and the distance BFL between the image-side surface of the sixth lens element and the image plane on the optical axis satisfy: BFL/TTL is more than 0.14 and less than 0.15.
In some embodiments, the optical stop of the optical lens is located between the second lens and the third lens, or the optical stop of the optical lens is located between the third lens and the fourth lens.
In some embodiments, the effective focal length f of the optical lens and the combined focal length f of all lenses after the stopRear endSatisfies the following conditions: 2.0 < fRear end/f＜3.2。
Compared with the prior art, the invention has the beneficial effects that: the first lens adopts a glass lens similar to a fisheye shape, and the curvature radius of the object side surface of the first lens is smaller, so that more light rays of a super-wide-angle field can be received, the illumination is improved, the aberration is corrected, and the small caliber of the lens head is facilitated; the second lens is a negative lens, so that light can be better transited, and pupil aberration and spherical aberration can be corrected; the distortion of the system can be controlled by controlling the focal power of the second lens and the third lens, and the imaging deformation caused by the distortion is reduced; the optical lens optimizes high-order aberration, so that the resolution is further improved, and the optical lens has a large aperture, so that strong light and weak light can be satisfied, and even in a dark environment, no difference is monitored and early-warned. The optical lens has the advantages of being few in ghost and stray light, having the characteristics of high definition, super wide angle, large aperture, large CRA and the like, and being capable of meeting the use requirements of industries such as monitoring and early warning.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical lens system according to embodiment 1 of the present invention;
fig. 2 is a MTF graph of the optical lens in embodiment 1 of the present invention;
FIG. 3 is a graph showing F-Theta distortion of an optical lens in example 1 of the present invention;
FIG. 4 is a graph of a chief ray angle of an optical lens in embodiment 1 of the present invention;
fig. 5 is a schematic structural diagram of an optical lens system according to embodiment 2 of the present invention;
fig. 6 is a MTF graph of an optical lens in embodiment 2 of the present invention;
FIG. 7 is a graph showing F-Theta distortion of an optical lens in example 2 of the present invention;
FIG. 8 is a graph of chief ray angles of an optical lens in embodiment 2 of the present invention;
fig. 9 is a schematic structural diagram of an optical lens system according to embodiment 3 of the present invention;
fig. 10 is a MTF graph of an optical lens in embodiment 3 of the present invention;
FIG. 11 is a graph showing F-Theta distortion of an optical lens in example 3 of the present invention;
fig. 12 is a graph of a chief ray incident angle of the optical lens in embodiment 3 of the present invention.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of embodiments of the application and does not limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present invention.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
An optical lens according to an embodiment of the present application includes, in order from an object side to an imaging surface: the lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens and a sixth lens.
Wherein, the toolThe first lens with negative focal power has a convex object-side surface and a concave image-side surface; the first lens is in a meniscus shape with the convex surface facing the object side, can collect large view field light rays as far as possible to enter a rear optical system, increases the light flux, and is beneficial to realizing the whole large view field range. The first lens may use a high refractive index material, for example, the refractive index of the first lens satisfies Nd1Not less than 1.8, which is beneficial to the reduction of the front end caliber and the improvement of the imaging quality.
The image side surface of the second lens is a concave surface; the image side surface of the second lens is provided with a concave surface, so that the deflection angle of light rays is smooth, collected light rays can smoothly enter the rear optical system after being collected, and the miniaturization of the rear end of the lens is facilitated. In addition, the second lens can use a material with high Abbe number, for example, the Abbe number of the second lens satisfies Vd2The lens is more than or equal to 56, which is beneficial to reducing chromatic aberration generated by a front lens and improving the imaging quality of the optical lens.
A third lens having a positive refractive power, both the object-side surface and the image-side surface of the third lens being convex; the third lens is a biconvex lens, which is favorable for converging light rays, so that the diverging light rays smoothly enter a rear optical system after being converged, and the miniaturization is facilitated.
A fourth lens having a positive refractive power, both the object-side surface and the image-side surface of the fourth lens being convex; the fourth lens is a biconvex lens which is favorable for converging the divergent light rays to a rear optical system, and can shorten the optical path of the peripheral light rays reaching an imaging surface, thereby improving the resolution quality.
A fifth lens element having a negative refractive power, both the object-side surface and the image-side surface of the fifth lens element being concave; a sixth lens element having a positive refractive power, wherein both the object-side surface and the image-side surface are convex; and the sixth lens with positive focal power can make the light rays converged by the fifth lens at the front end firstly diverge and transit, and then further correct aberration and converge the light rays to an imaging surface through the sixth lens with positive focal power. In addition, the sixth lens with positive focal power can balance the spherical aberration introduced by the fifth lens and improve the imaging quality of the optical lens.
In some embodiments, the image-side surface of the fifth mirror can be cemented with the object-side surface of the sixth mirror, and the fifth mirror and the sixth mirror can be combined into a cemented lens, which can help to eliminate chromatic aberration influence, reduce field curvature, and correct coma; meanwhile, the cemented lens may also retain a part of chromatic aberration to balance the entire chromatic aberration of the optical system. In the cemented lens, the fifth lens near the object side has negative power, the sixth lens near the image side has positive power, and the positive and negative lenses are cemented to reduce aberration and optical total length. In addition, the gluing of the lens can reduce tolerance sensitivity problems of inclination, core deviation and the like of the lens unit caused in the assembling process.
In some embodiments, the first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspheric lenses. The front end of the optical lens adopts a glass lens, which is beneficial to improving the temperature drift of the lens and ensures that the optical lens has excellent imaging quality at different temperatures.
In some embodiments, the maximum field angle FOV of the optical lens satisfies FOV < 220 °. The range is satisfied, and the view finding range of shooting is widened.
In some embodiments, the optical lens has an F-number of 1.6 ≦ F # ≦ 1.8. Satisfy above-mentioned scope, can have big light ring characteristic, can obviously increase luminous flux, even also can possess good formation of image effect under darker environment, satisfy the monitoring alarm ability at night.
In some embodiments, the real image height IH and the entrance pupil diameter EPD corresponding to the maximum field angle of the optical lens satisfy: IH/EPD is more than 3.0 and less than 3.5. The range is met, so that the number of light rays entering the lens can be influenced by controlling the diameter of the entrance pupil on the basis of large image plane and high-quality imaging, and the lens can meet the requirement of image plane brightness with sufficient marginal field of view.
In some embodiments, the total optical length TTL and the effective focal length f of the optical lens satisfy:
10.0＜TTL/f＜11.0，
the size and the weight of the fixed-focus lens can be further reduced, so that the lens becomes smaller and lighter, and the cost is effectively reduced.
In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens satisfies the effective focal length f and the maximum field angle FOV:
the method meets the range, can control the F-Theta distortion of the lens, reduce the deformation degree of imaging, avoid the adjustment of the image quality at a module or a product end, reduce the redowner of the image quality processing by a host, and reduce the influence of the algorithm and other means after additional distortion correction.
In some embodiments, the total optical length TTL of the optical lens and the effective focal length f and the maximum field angle FOV satisfy:
the optical total length of the lens can be controlled to meet the requirement of miniaturization; meanwhile, the problem that the resolving power is reduced due to the fact that the lens aberration is difficult to correct due to the fact that the focal length of each lens is too large is avoided.
In some embodiments, the chief ray incident angle CRA of the optical lens and the effective focal length f satisfy: 25 °/mm < CRA/f < 35 °/mm. The CRA value of the lens can be matched with the CRA value of the image sensor, so that the edge of the image sensor uniformly receives light, and the interference of lens shadow and color shadow on the imaging quality is reduced.
In some embodiments, the knoop hardness Hk1 of the material of the first lens of the optical lens satisfies: hk1 > 680kg/mm2. Satisfy above-mentioned scope for the material of first lens has higher hardness, has guaranteed that first lens has appropriate central thickness, has reduced on the first lens because the parasitic light influence that appearance defects such as pit, mar brought, thereby promotes optical lens's imaging quality.
In some embodiments, the effective focal length f1 of the first lens and the center thickness CT1 of the first lens satisfy: -5.5 < f1/CT1 < -2.0. Satisfying the above range, it is possible to prevent the sensitivity of the first lens element from being reduced due to an excessively large focal length and an excessively strong refractive power of the first lens element, thereby generating a large aberration; meanwhile, the defect that large-angle light rays cannot enter the lens due to insufficient refractive power of the first lens can be avoided, and the wide angle and the miniaturization of an imaging system are further avoided.
In some embodiments, the central thickness CT5 of the fifth lens and the central thickness CT6 of the sixth lens satisfy: 0.35 < CT5/CT6 < 0.6. Satisfying above-mentioned scope, can reducing the exit angle of light, guarantee that light incides to image sensor with suitable angle on to improve image sensor's sensitivity, reduce the possibility that optical lens produced the vignetting, be favorable to the wide-angle and the miniaturization of camera lens when having improved the optical property of camera lens.
In some embodiments, the maximum field angle FOV of the optical lens and the true image height IH corresponding to the maximum field angle satisfy: 105 °/mm < FOV/IH < 110 °/mm. The method meets the range, can control the F-Theta distortion of the lens in a smaller range, and further better meets the requirements of a module algorithm.
In some embodiments, the temperature coefficient of refractive index dn/dt of the third lens of the optical lens and the effective focal length f satisfy: 3.8 < (dn/dt)/f. The temperature drift of the optical lens can be effectively controlled, and the good imaging performance of the lens under the high-temperature and low-temperature environments is guaranteed.
In some embodiments, the total optical length TTL of the optical lens element and the distance BFL between the image-side surface of the sixth lens element and the image plane on the optical axis satisfy: BFL/TTL is more than 0.14 and less than 0.15. Satisfy above-mentioned scope, on the one hand be favorable to the effective utilization of lens size, on the other hand is favorable to reserving sufficient sixth lens image side face to the image plane on the optical axis apart from, guarantees the image height of camera lens and the matching nature of CRA.
In some embodiments, a stop for limiting the light beam may be disposed between the third lens and the fourth lens to further improve the imaging quality of the lens. When the diaphragm is arranged between the third lens and the fourth lens, the light rays entering the optical system are favorably converged, and the aperture of the optical lens is reduced.
In some embodiments, a diaphragm for limiting the light beam can be further arranged between the second lens and the third lens, so as to further improve the imaging quality of the lens. When the diaphragm is arranged between the second lens and the third lens, the thickness of the third lens is effectively reduced, the F-Theta distortion of the lens is effectively controlled, and the imaging deformation of the lens is reduced.
In some embodiments, the effective focal length f of the optical lens and the combined focal length f of all lenses after the stopRear endSatisfies the following conditions: 2.0 < fRear endThe/f is less than 3.2. The field curvature and the astigmatism of the lens can be corrected, and the overall resolving power of the lens can be improved.
In order to make the system have better optical performance, four aspheric lenses are adopted in the lens, and the shapes of the aspheric surfaces of the optical lens satisfy the following equations:
wherein z is the distance between the curved surface and the vertex of the curved surface in the optical axis direction, h is the distance between the optical axis and the curved surface, c is the curvature of the vertex of the curved surface, K is the coefficient of the quadric surface, and B, C, D, E, F are the coefficients of the fourth order, the sixth order, the eighth order, the tenth order and the twelfth order curved surfaces respectively.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
Example 1
Referring to fig. 1, a schematic structural diagram of an optical lens system according to embodiment 1 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a third lens L3, a stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
The first lens element L1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2;
the second lens L2 has negative power, and both the object-side surface S3 and the image-side surface S4 are concave;
the third lens L3 has positive power, and both the object-side surface S5 and the image-side surface S6 are convex;
a diaphragm ST;
the fourth lens L4 has positive power, and both the object-side surface S7 and the image-side surface S8 are convex;
the fifth lens L5 has negative power, and both the object-side surface S9 and the image-side surface S10 are concave;
the sixth lens L6 has positive power, and both the object-side surface S11 and the image-side surface S12 are convex.
The first lens element L1 and the third lens element L3 are glass spherical lenses, and the second lens element L2, the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 are plastic aspheric lenses.
The relevant parameters of each lens in the optical lens in the present embodiment are shown in table 1-1.
TABLE 1-1
In addition, the surface type parameters of the aspherical lens of the optical lens in this embodiment are shown in table 1-2.
Tables 1 to 2
| Flour mark | K | B | C | D | E | F |
| S3 | 100.15885 | 1.51E-02 | -1.06E-02 | 1.80E-03 | 1.59E-04 | -4.19E-05 |
| S4 | -19.97090 | 2.07E-01 | -1.20E-01 | 7.03E-02 | -2.19E-02 | 6.21E-03 |
| S7 | -37.61979 | 2.66E-01 | -4.01E-01 | 4.87E-01 | -3.34E-01 | 8.62E-02 |
| S8 | -20.30976 | -4.40E-01 | 9.38E-01 | -9.71E-01 | 3.62E-01 | -2.35E-02 |
| S9 | 26.83414 | -3.86E-01 | 5.72E-01 | -2.68E-01 | -2.81E-01 | 2.19E-01 |
| S10 | -8.41542 | 3.38E-02 | -5.39E-02 | 7.54E-02 | -5.01E-02 | 1.05E-02 |
| S11 | 6.84636 | 1.17E-02 | -2.43E-02 | 1.47E-02 | 1.34E-02 | -1.03E-02 |
| S12 | -11.54645 | -2.93E-01 | 3.96E-01 | -3.34E-01 | 1.61E-01 | -2.94E-02 |
In the present embodiment, the MTF graph, the F-Theta distortion graph, and the chief ray incident angle graph of the optical lens 100 are shown in fig. 2, 3, and 4, respectively.
Referring to fig. 2, an MTF graph of the present embodiment is shown, which shows the modulation degree of lens imaging at different spatial frequencies in each field, the horizontal axis shows the spatial frequency (unit: lp/mm), and the vertical axis shows the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.45 in the whole field of view, and in the range of 0-93 (lp/mm), the MTF curve is uniformly and smoothly reduced in the process from the center to the edge field of view, and the MTF curve has good imaging quality and good detail resolution capability under the conditions of low frequency and high frequency.
Referring to FIG. 3, a graph of F-Theta distortion of the present embodiment is shown, wherein the F-Theta distortion is shown for different wavelengths of light under different viewing fields, the horizontal axis represents the F-Theta distortion (unit: percentage), and the vertical axis represents the half field angle (unit:deg.). As can be seen from the figure, the F-Theta distortion value of the embodiment is within 8 percent, and the F-Theta distortion is smaller.
Referring to FIG. 4, a graph of chief ray incidence angles of the present embodiment is shown, which shows CRA values at different image heights, with the horizontal axis showing true image height (unit: mm) and the vertical axis showing CRA values (unit:deg.). As can be seen from the figure, the CRA value of the embodiment is 25.3 ° at the edge of the image sensor, and the error between the CRA value of the image sensor and the CRA value of the image sensor is controlled within a range of ± 3 °, so that not only can the loss of photoelectric conversion be reduced, but also the edge illuminance can be ensured and the color cast problem can be improved.
Example 2
Referring to fig. 5, a schematic structural diagram of an optical lens provided in embodiment 2 of the present invention is shown, where the optical lens in embodiment 2 of the present invention has a structure substantially the same as the optical lens in embodiment 1, except that a fifth lens and a sixth lens form a bonded body, and curvature radii and material choices of the lenses are different, and specific relevant parameters of the lenses are shown in table 2-1.
The parameters related to each lens of the optical lens provided in this embodiment are shown in table 2-1.
TABLE 2-1
In addition, the surface type parameters of the aspherical lens of the optical lens in this embodiment are shown in table 2-2.
Tables 2 to 2
| Flour mark | K | B | C | D | E | F |
| S3 | 57.80468 | 8.02E-04 | -2.82E-03 | 7.32E-04 | -1.16E-04 | 1.07E-05 |
| S4 | -3.24255 | 2.00E-01 | -7.36E-02 | 3.16E-02 | -1.44E-02 | 2.65E-03 |
| S7 | -0.02239 | 4.37E-02 | -6.52E-02 | 2.73E-01 | -3.18E-01 | 1.70E-01 |
| S8 | -275.12629 | -1.35E-01 | 3.06E-01 | -1.64E-01 | -3.19E-01 | 4.26E-01 |
| S9 | -0.33585 | 9.05E-02 | -1.34E-01 | -3.69E-01 | 6.16E-01 | -3.14E-01 |
| S10/S11 | -19.29732 | 1.21E+00 | -1.95E+00 | 1.85E+00 | -1.00E+00 | 2.51E-01 |
| S12 | -28.38979 | -1.86E-01 | 2.59E-01 | -2.29E-01 | 1.34E-01 | -2.88E-02 |
In the present embodiment, the MTF graph, the F-Theta distortion graph, and the chief ray incident angle graph of the optical lens are shown in fig. 6, 7, and 8, respectively.
Referring to fig. 6, an MTF graph of the present embodiment is shown, which shows the modulation degree of lens imaging at different spatial frequencies in each field, the horizontal axis shows the spatial frequency (unit: lp/mm), and the vertical axis shows the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.45 in the whole field of view, and in the range of 0-93 (lp/mm), the MTF curve is uniformly and smoothly reduced in the process from the center to the edge field of view, and the MTF curve has good imaging quality and good detail resolution capability under the conditions of low frequency and high frequency.
Referring to fig. 7, an F-Theta distortion diagram of the optical lens of the present embodiment is shown, wherein the horizontal axis represents F-Theta distortion (unit:%) and the vertical axis represents half field angle (unit:%). As can be seen from the figure, the F-Theta distortion value of the embodiment is within 8 percent, and the F-Theta distortion is smaller.
Referring to FIG. 8, a graph of chief ray incidence angles of the present embodiment is shown, in which the horizontal axis represents CRA values at different image heights, the horizontal axis represents true image height (unit: mm), and the vertical axis represents CRA values (unit:deg.). As can be seen from the figure, the CRA value of the embodiment is 31.3 ° at the edge of the image sensor, and the error between the CRA value of the image sensor and the CRA value of the image sensor is controlled within a range of ± 3 °, so that the loss of photoelectric conversion can be reduced, the edge illuminance can be ensured, and the color cast problem can be improved.
Example 3
Referring to fig. 9, a schematic structural diagram of an optical lens according to a third embodiment of the present invention is shown, and the optical lens according to the third embodiment of the present invention has a structure substantially the same as that of the optical lens according to embodiment 1, except that an object-side surface of the second lens is a convex surface, a stop is disposed between the second lens and the third lens, curvature radii and material selections of the lenses are different, and specific relevant parameters of the lenses are shown in table 3-1.
The parameters related to each lens of the optical lens provided in this embodiment are shown in table 3-1.
TABLE 3-1
Further, the relevant parameters of the aspherical lens of the optical lens in the present embodiment are shown in table 3-2.
TABLE 3-2
| Flour mark | K | B | C | D | E | F |
| S3 | -100.19476 | -1.56E-02 | -6.31E-03 | 3.80E-03 | -6.26E-04 | 2.87E-05 |
| S4 | -0.33568 | -1.55E-01 | 2.28E-01 | -2.67E-01 | 1.58E-01 | -3.46E-02 |
| S7 | -61.14059 | 1.30E-01 | -2.15E-01 | 1.77E-01 | -9.63E-02 | 1.93E-02 |
| S8 | -72.82586 | -3.88E-01 | 4.59E-01 | -3.36E-01 | 8.42E-02 | 5.96E-03 |
| S9 | -95.27928 | -6.00E-01 | 6.82E-01 | -3.30E-01 | -3.81E-02 | 5.72E-02 |
| S10 | -3.56463 | -6.29E-02 | -5.47E-02 | 1.49E-01 | -9.56E-02 | 1.95E-02 |
| S11 | 4.48185 | 8.76E-02 | -1.66E-01 | 4.59E-02 | 3.31E-02 | -1.33E-02 |
| S12 | -19.89033 | -2.42E-01 | 3.96E-01 | -3.12E-01 | 1.14E-01 | -1.05E-02 |
In the present embodiment, the MTF graph, the F-Theta distortion graph, and the chief ray incident angle graph of the optical lens 300 are shown in fig. 10, 11, and 12, respectively.
Referring to fig. 10, an MTF graph of the present embodiment is shown, which shows modulation degrees of lens imaging at different spatial frequencies in each field, where the horizontal axis shows spatial frequency (unit: 1p/mm) and the vertical axis shows MTF values. As can be seen from the figure, the MTF value of the embodiment is above 0.45 in the whole field of view, and in the range of 0-93 (lp/mm), the MTF curve is uniformly and smoothly reduced in the process from the center to the edge field of view, and the MTF curve has good imaging quality and good detail resolution capability under the conditions of low frequency and high frequency.
Referring to fig. 11, an F-Theta distortion diagram of the optical lens of the present embodiment is shown, wherein the horizontal axis represents F-Theta distortion (unit:%) and the vertical axis represents half field angle (unit:%). As can be seen from the figure, the F-Theta distortion value of the embodiment is within 4 percent, and the F-Theta distortion is smaller.
Referring to fig. 12, a graph of chief ray incidence angles of the present embodiment is shown, in which the horizontal axis represents CRA values at different image heights, the horizontal axis represents true image height (unit: mm), and the vertical axis represents CRA values (unit: °). As can be seen from the figure, the CRA value of the embodiment is 27.3 ° at the edge of the image sensor, and the error between the CRA value of the image sensor and the CRA value of the image sensor is controlled within a range of ± 3 °, so that not only can the loss of photoelectric conversion be reduced, but also the edge illuminance can be ensured and the color cast problem can be improved.
Please refer to table 4, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length F, the total optical length TTL, the F-number F #, the real image height TH, and the maximum field angle FOV of the optical lens, and the values corresponding to each conditional expression in the embodiments.
TABLE 4
In conclusion, the optical lens provided by the invention adopts a glass-plastic mixed matching structure, and particularly adopts two glass lenses and four plastic lenses in a specified position sequence, so that the lens has good imaging quality in high and low temperature environments, the weight and the volume of the lens are effectively reduced, and the processing cost is reduced; meanwhile, the lenses are compactly arranged, so that the length of the lens is effectively reduced, and the head of the lens is smaller, so that the lens has smaller volume; and because the diaphragm and each lens structure of camera lens set up rationally, can make the light quantity of wider scope get into the fuselage, satisfy the imaging demand of light and shade environment. The optical lens optimizes high-order aberration, so that the resolution is further improved, and the optical lens has a large aperture, so that strong light and weak light can be satisfied, and even in a dark environment, no difference is monitored and early-warned. The optical lens has the advantages of being few in ghost and stray light, having the characteristics of high definition, super wide angle, large aperture, large CRA and the like, and being capable of meeting the use requirements of industries such as monitoring and early warning.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An optical lens system comprising six lenses, comprising, in order from an object side to an image plane along an optical axis:
the first lens with negative focal power has a convex object-side surface and a concave image-side surface;
the image side surface of the second lens is a concave surface;
a third lens having a positive refractive power, both the object-side surface and the image-side surface of the third lens being convex;
a fourth lens having a positive refractive power, both the object-side surface and the image-side surface of the fourth lens being convex;
a fifth lens element having a negative refractive power, both the object-side surface and the image-side surface of the fifth lens element being concave;
a sixth lens element having a positive refractive power, wherein both the object-side surface and the image-side surface are convex;
the real image height IH and the entrance pupil diameter EPD corresponding to the maximum field angle of the optical lens meet the following requirements: IH/EPD is more than 3.0 and less than 3.5;
the total optical length TTL and the effective focal length f of the optical lens meet the following requirements: TTL/f is more than 10.0 and less than 11.0.
2. The optical lens according to claim 1, wherein a real image height IH corresponding to a maximum field angle of the optical lens satisfies an effective focal length f and a maximum field angle FOV:
3. an optical lens according to claim 1, wherein the total optical length TTL and the effective focal length f and the maximum field angle FOV of the optical lens satisfy:
4. an optical lens according to claim 1, characterized in that the chief ray angle CRA and the effective focal length f of the optical lens satisfy: 25 °/mm < CRA/f < 35 °/mm.
5. An optical lens according to claim 1, characterized in that the effective focal length f1 of the first lens and the central thickness CT1 of the first lens satisfy: -5.5 < f1/CT1 < -2.0.
6. An optical lens according to claim 1, characterized in that the central thickness CT5 of the fifth lens and the central thickness CT6 of the sixth lens satisfy: 0.35 < CT5/CT6 < 0.6.
7. The optical lens according to claim 1, wherein the maximum field angle FOV of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 105 °/mm < FOV/IH < 110 °/mm.
8. An optical lens barrel according to claim 1, wherein the total optical length TTL and an axial distance BFL from the image-side surface of the sixth lens element to the image plane satisfy: BFL/TTL is more than 0.14 and less than 0.15.
9. An optical lens according to claim 1, characterized in that the optical stop of the optical lens is located between the second lens and the third lens or the optical stop of the optical lens is located between the third lens and the fourth lens.
10. An optical lens according to claim 9, characterized in that the effective focal length f of the optical lens and the combined focal length f of all lenses after the diaphragmRear endSatisfies the following conditions: 2.0 < fRear end/f＜3.2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111626017.4A CN114217416B (en) | 2021-12-28 | 2021-12-28 | optical lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111626017.4A CN114217416B (en) | 2021-12-28 | 2021-12-28 | optical lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114217416A true CN114217416A (en) | 2022-03-22 |
| CN114217416B CN114217416B (en) | 2023-11-14 |
Family
ID=80706362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111626017.4A Active CN114217416B (en) | 2021-12-28 | 2021-12-28 | optical lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114217416B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114415347A (en) * | 2022-03-30 | 2022-04-29 | 江西联创电子有限公司 | Optical lens |
| CN115220199A (en) * | 2022-09-20 | 2022-10-21 | 江西联创电子有限公司 | Projection lens |
| TWI819758B (en) * | 2022-08-22 | 2023-10-21 | 新鉅科技股份有限公司 | Imaging lens assembly and photographing module |
| TWI819742B (en) * | 2022-08-10 | 2023-10-21 | 新鉅科技股份有限公司 | Optical lens assembly and photographing module |
| CN117389011A (en) * | 2023-12-12 | 2024-01-12 | 联创电子科技股份有限公司 | Optical lens |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090251801A1 (en) * | 2008-04-04 | 2009-10-08 | Samsung Electro-Mechanics Co., Ltd. | Super wide angle optical system |
| CN209215714U (en) * | 2018-11-27 | 2019-08-06 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN110109233A (en) * | 2019-05-28 | 2019-08-09 | 广东弘景光电科技股份有限公司 | Large aperture optical system and its camera module of application |
| CN111929874A (en) * | 2020-09-22 | 2020-11-13 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
| CN113467046A (en) * | 2020-03-30 | 2021-10-01 | 华为技术有限公司 | Optical lens, camera module and detector |
-
2021
- 2021-12-28 CN CN202111626017.4A patent/CN114217416B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090251801A1 (en) * | 2008-04-04 | 2009-10-08 | Samsung Electro-Mechanics Co., Ltd. | Super wide angle optical system |
| CN209215714U (en) * | 2018-11-27 | 2019-08-06 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN110109233A (en) * | 2019-05-28 | 2019-08-09 | 广东弘景光电科技股份有限公司 | Large aperture optical system and its camera module of application |
| CN113467046A (en) * | 2020-03-30 | 2021-10-01 | 华为技术有限公司 | Optical lens, camera module and detector |
| CN111929874A (en) * | 2020-09-22 | 2020-11-13 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114415347A (en) * | 2022-03-30 | 2022-04-29 | 江西联创电子有限公司 | Optical lens |
| TWI819742B (en) * | 2022-08-10 | 2023-10-21 | 新鉅科技股份有限公司 | Optical lens assembly and photographing module |
| TWI819758B (en) * | 2022-08-22 | 2023-10-21 | 新鉅科技股份有限公司 | Imaging lens assembly and photographing module |
| CN115220199A (en) * | 2022-09-20 | 2022-10-21 | 江西联创电子有限公司 | Projection lens |
| CN115220199B (en) * | 2022-09-20 | 2023-02-28 | 江西联创电子有限公司 | Projection lens |
| CN117389011A (en) * | 2023-12-12 | 2024-01-12 | 联创电子科技股份有限公司 | Optical lens |
| CN117389011B (en) * | 2023-12-12 | 2024-03-19 | 联创电子科技股份有限公司 | Optical lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114217416B (en) | 2023-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114217416B (en) | optical lens | |
| CN109960020B (en) | Optical lens | |
| US7733581B2 (en) | Large aperture imaging optical system | |
| CN108535834A (en) | optical lens and imaging device | |
| CN115128769B (en) | Optical lens | |
| WO2021007930A1 (en) | Micro imaging lens for short-distance imaging | |
| CN115128771B (en) | Optical lens | |
| CN112099205A (en) | Wide-angle lens | |
| CN115079384B (en) | Optical lens | |
| CN114415349B (en) | Optical lens | |
| CN114415347B (en) | Optical lens | |
| CN108681035A (en) | Super large aperture tight shot | |
| CN109143555B (en) | Zoom lens | |
| CN114415350A (en) | Optical lens | |
| CN115508986B (en) | Optical lens | |
| CN114252981B (en) | optical lens | |
| CN114415348B (en) | Optical lens | |
| CN116609927A (en) | Fish-eye lens | |
| CN114415345B (en) | Optical lens | |
| CN109116514A (en) | The iris recognition camera lens of big field of view angle | |
| CN208795915U (en) | The iris recognition camera lens of big field of view angle | |
| CN220526089U (en) | Unmanned aerial vehicle camera lens | |
| CN116990942B (en) | Optical lens | |
| CN115128781B (en) | Optical lens | |
| CN219891477U (en) | Optical lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |