CN106990512B - Iris lens - Google Patents
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- CN106990512B CN106990512B CN201710386419.9A CN201710386419A CN106990512B CN 106990512 B CN106990512 B CN 106990512B CN 201710386419 A CN201710386419 A CN 201710386419A CN 106990512 B CN106990512 B CN 106990512B
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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
- G02B13/0035—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 three lenses
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/18—Eye characteristics, e.g. of the iris
- G06V40/19—Sensors therefor
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Abstract
The application discloses iris lens has total effective focal length f, and this iris lens includes according to the preface from the thing side to the imaging surface along the optical axis: a first lens, a second lens, and a third lens. The first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens and the third lens both have positive optical power or negative optical power. The distance TTL from the object side surface of the first lens to the imaging surface on the optical axis and the total effective focal length f meet 0.7< TTL/f < 1.1.
Description
Technical Field
The present invention relates to an iris lens, and more particularly, to an iris lens including three lenses.
Background
In recent years, with the development of science and technology, portable electronic products have been gradually raised, and more people enjoy portable electronic products having an image capturing function, so that the demand of the market for an image capturing lens suitable for portable electronic products has been gradually increased. The photosensitive element of the currently used camera lens is typically a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor). With the advancement of semiconductor process technology, the optical system tends to have higher pixels, and the pixel size of the chip becomes smaller and smaller, which puts higher demands on the high imaging quality and miniaturization of the lens used in cooperation.
Particularly in the field of biometric identification, with the development of biometric identification technology, the requirements on the iris lens are higher and higher to meet the application requirements on different products. The iris lens applied to the technology needs to ensure compact structure and have higher brightness and image resolving power so as to improve the identification precision of the lens.
Therefore, it is desirable to provide an iris lens having a compact structure, high imaging quality, and high recognition accuracy.
Disclosure of Invention
The technical solution provided by the present application at least partially solves the technical problems described above.
According to an aspect of the present application, there is provided an iris lens having a total effective focal length f and including, in order from an object side to an image plane along an optical axis: a first lens, a second lens, and a third lens. The first lens has positive focal power, and the object side surface of the first lens can be a convex surface; the second lens and the third lens both have positive optical power or negative optical power. The distance TTL between the object side surface of the first lens and the imaging surface on the optical axis and the total effective focal length f can satisfy 0.7< TTL/f < 1.1.
According to another aspect of the present application, there is provided an iris lens, in order from an object side to an image plane along an optical axis, comprising: a first lens, a second lens, and a third lens. The first lens has positive focal power, and the object side surface of the first lens can be a convex surface; the second lens and the third lens both have positive power or negative power. Wherein, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis can satisfy 1.7< CT1/CT2< 3.
According to another aspect of the present application, there is provided an iris lens, in order from an object side to an image plane along an optical axis, comprising: a first lens, a second lens, and a third lens. The first lens has positive focal power, and the object side surface of the first lens can be a convex surface; the second lens and the third lens both have positive optical power or negative optical power. And the distance SAG32 between the intersection point of the image side surface of the third lens and the optical axis and the effective radius vertex of the image side surface of the third lens on the optical axis and the central thickness CT3 of the third lens on the optical axis can meet 0.1< | SAG32/CT3| < 0.8.
In one embodiment, the iris lens may further include an aperture stop disposed between the object side and the first lens, and a distance SL between the aperture stop and the imaging surface on the optical axis and a distance TTL between an object side surface of the first lens and the imaging surface on the optical axis may satisfy 0.70< SL/TTL < 1.25.
In one embodiment, a center thickness CT1 of the first lens element on the optical axis, a center thickness CT2 of the second lens element on the optical axis, and a center thickness CT3 of the third lens element on the optical axis may satisfy 0.8< CT1/(CT2+ CT3) < 1.3.
In one embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half of the diagonal length ImgH of the effective pixel area of the electronic photosensitive element on the imaging surface can satisfy TTL/ImgH ≦ 2.65.
In one embodiment, a distance TTL between an object side surface of the first lens element and an image plane on the optical axis and a total effective focal length f of the iris lens may satisfy 0.7< TTL/f < 1.1.
In one embodiment, a sum Σ CT of center thicknesses on the optical axis of the first lens to the third lens and a distance TTL on the optical axis from an object side surface of the first lens to the image forming surface may satisfy Σ CT/TTL <0.4, respectively.
In one embodiment, a distance SAG32 on the optical axis between an intersection of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens and a central thickness CT3 of the third lens on the optical axis may satisfy 0.1< | SAG32/CT3| < 0.8.
In one embodiment, the image-side surface of the first lens may be concave, and a radius of curvature R2 of the image-side surface of the first lens and an effective focal length f1 of the first lens may satisfy 1.2< R2/f1< 1.7.
In one embodiment, the second lens may have a negative optical power, and-0.9 < f1/f2< -0.2 may be satisfied between the effective focal length f1 of the first lens and the effective focal length f2 of the second lens.
In one embodiment, an effective radius DT11 of the object side surface of the first lens and an effective radius DT22 of the image side surface of the second lens may satisfy 1.2< DT11/DT22< 1.8.
In one embodiment, the iris lens further includes an IR infrared filter having a band pass band of 750nm to 900nm disposed between the third lens and the imaging surface. More specifically, the band pass band of the IR infrared filter may be 790 to 830 nm.
The iris lens has the beneficial effects of compact structure, miniaturization, high brightness, high identification precision, high imaging quality and the like by reasonably distributing the focal power and the surface type of each lens of the optical lens.
Drawings
Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments thereof, when taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a schematic structural diagram of an iris lens according to embodiment 1 of the present application;
fig. 2A to 2D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the iris lens of embodiment 1;
fig. 3 is a schematic view showing a structure of an iris lens according to embodiment 2 of the present application;
fig. 4A to 4D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the iris lens of embodiment 2, respectively;
fig. 5 is a schematic view showing a structure of an iris lens according to embodiment 3 of the present application;
fig. 6A to 6D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the iris lens of embodiment 3, respectively;
fig. 7 is a schematic structural diagram of an iris lens according to embodiment 4 of the present application;
fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the iris lens of embodiment 4;
fig. 9 is a schematic view showing a structure of an iris lens according to embodiment 5 of the present application;
fig. 10A to 10D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the iris lens of embodiment 5;
fig. 11 is a schematic view showing a structure of an iris lens according to embodiment 6 of the present application;
fig. 12A to 12D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the iris lens of embodiment 6, respectively;
fig. 13 is a schematic view showing a structure of an iris lens according to embodiment 7 of the present application;
fig. 14A to 14D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of an iris lens of embodiment 7;
fig. 15 is a schematic structural view of an iris lens according to embodiment 8 of the present application;
fig. 16A to 16D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the iris lens of example 8, respectively.
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 exemplary embodiments of the present application and does not limit the scope of the present 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 application.
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.
The paraxial region refers to a region near the optical axis. Herein, a surface closest to the object in each lens is referred to as an object side surface, and a surface closest to the imaging surface in each lens is referred to as an image side surface.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "including," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, 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.
The following provides a detailed description of the features, principles, and other aspects of the present application.
An iris lens according to an exemplary embodiment of the present application includes, for example, three lenses, i.e., a first lens, a second lens, and a third lens. The three lenses are arranged in order from the object side to the image plane along the optical axis.
In an exemplary embodiment, the first lens may have a positive optical power, and the object-side surface thereof may be convex; the second lens has positive focal power or negative focal power; and the third lens has positive power or negative power.
In some embodiments, an aperture stop STO for limiting a light beam may be disposed between the object side and the first lens to improve the imaging quality of the iris lens. The distance SL between the on-axis distance from the aperture stop STO to the imaging surface of the iris lens and the distance TTL between the object side surface of the first lens and the imaging surface of the iris lens can meet the condition that SL/TTL is more than 0.70 and less than 1.25, more specifically, SL and TTL can further meet the condition that SL/TTL is more than or equal to 0.85 and less than or equal to 1.05, and the effects of high resolution, miniaturization and small front opening are achieved.
Optionally, the iris lens may further include a filter disposed between the third lens and the imaging surface. The filter can be an IR (infrared) filter which can be used for filtering visible light noise, so that the high-performance identification effect of the lens is realized. The band pass band of the filter can be about 750nm to about 900nm, and more specifically, the band pass band can be about 790nm to about 830nm, so as to reduce white light interference and improve the identification effect of the iris lens.
The on-axis distance TTL from the object side surface of the first lens to the imaging surface of the iris lens and the half of the length ImgH of the diagonal line of the effective pixel area on the imaging surface of the iris lens can meet the condition that TTL/ImgH is less than or equal to 2.65, and more specifically, TTL and ImgH can further meet the condition that TTL/ImgH is less than or equal to 2.50 and less than or equal to 2.64, so that the iris lens is compact in structure and small in size.
The axial distance between the TTL from the object side surface of the first lens to the imaging surface of the iris lens and the total effective focal length f of the iris lens can satisfy 0.7< TTL/f <1.1, more specifically, TTL and f further satisfy 0.88 < TTL/f < 0.94, so that the miniaturization is realized and the longer focal length is ensured.
In application, the center thickness of each lens can be reasonably configured to reduce aberration and improve the resolution and recognition accuracy of the lens. For example, 1.7< CT1/CT2<3 may be satisfied between the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis, and more specifically, CT1 and CT2 may further satisfy 1.91 ≦ CT1/CT2 ≦ 2.95. For another example, 0.8< CT1/(CT2+ CT3) <1.3 may be satisfied between the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis, and more specifically, CT1, CT2, and CT3 may further satisfy 0.89 ≦ CT1/(CT2+ CT3) ≦ 1.26.
In addition, sigma CT/TTL between the central thickness sum sigma CT on the optical axis of the first lens to the third lens and the axial distance TTL between the object side surface of the first lens and the imaging surface of the iris lens can be more than or equal to 0.4, and more specifically, sigma CT and TTL can further be more than or equal to 0.33 and less than or equal to 0.37. The reasonable size distribution of the lenses is beneficial to lens assembly and production processing.
In some embodiments, an on-axis distance between the intersection of the image-side surface of the third lens and the optical axis to the vertex of the effective radius of the image-side surface of the third lens, SAG32, and the central thickness of the third lens on the optical axis, CT3, can satisfy 0.1< | SAG32/CT3| <0.8, more specifically SAG32 and CT3 can further satisfy 0.14 ≦ | SAG32/CT3| ≦ 0.72. The shape and focal power of the third lens are reasonably configured, so that the relative illumination of the lens is favorably improved, and the incident angle of the chief ray incident on the electronic photosensitive element is favorably controlled.
In some embodiments, the image side surface of the first lens can be concave. The radius of curvature R2 of the image-side surface of the first lens and the effective focal length f1 of the first lens may satisfy 1.2< R2/f1<1.7, and more specifically, R2 and f1 may further satisfy 1.22 ≦ R2/f1 ≦ 1.58. The shape and focal power of the first lens are reasonably configured, so that the aberration of the lens is favorably reduced, and the resolution and the recognition precision are improved.
In some embodiments, the second lens may have a negative optical power. The effective focal length f1 of the first lens and the effective focal length f2 of the second lens can satisfy-0.9 < f1/f2< -0.2, more specifically, f1 and f2 can further satisfy-0.89 ≦ f1/f2 ≦ -0.56. Through the reasonable distribution of the focal power of the lens, the aberration can be reduced, and the resolving power and the identification precision are improved.
In some embodiments, an effective radius DT11 of the object side surface of the first lens and an effective radius DT22 of the image side surface of the second lens may satisfy 1.2< DT11/DT22<1.8, and more particularly, DT11 and DT22 may further satisfy 1.47 ≦ DT11/DT22 ≦ 1.56.
According to the iris lens of the above embodiment of the present application, a plurality of lenses can be adopted, and by reasonably distributing the focal power, the surface type, the center thickness of each lens, the on-axis distance between each lens, and the like, the structure of the iris lens can be effectively compact, and the miniaturization of the iris lens can be ensured, so that the iris lens is more beneficial to production and processing and is applicable to portable electronic products. In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although three lenses are exemplified in the embodiment, the iris lens is not limited to include three lenses. The iris lens may also include other numbers of lenses, if desired.
Specific examples of the iris lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An iris lens according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic structural diagram of an iris lens according to embodiment 1 of the present application.
As shown in fig. 1, the iris lens includes three lenses L1-L3 arranged in order from an object side to an image plane along an optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6. Optionally, the iris lens may further include a filter L4 having an object-side surface S7 and an image-side surface S8. The filter L4 is an IR infrared filter with a band pass band of about 750nm to about 900nm, and further with a band pass band of about 790nm to about 830 nm. In the iris lens of the present embodiment, an aperture stop STO for limiting a light beam may be further provided between the object side and the first lens L1 to improve the imaging quality of the iris lens. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging surface S9.
Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the iris lens in example 1.
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Coefficient of cone |
| OBJ | Spherical surface | All-round | 500.0000 | ||
| STO | Spherical surface | Go to nothing | -0.4501 | ||
| S1 | Aspherical surface | 0.9810 | 0.6128 | 1.53/55.8 | -0.1718 |
| S2 | Aspherical surface | 3.1953 | 0.7231 | 10.6865 | |
| S3 | Aspherical surface | -2.3592 | 0.2400 | 1.62/23.5 | -99.0000 |
| S4 | Aspherical surface | 41.5979 | 0.6052 | 50.0000 | |
| S5 | Aspherical surface | -9.8320 | 0.2932 | 1.53/55.8 | -99.0000 |
| S6 | Aspherical surface | 17.6092 | 0.4153 | 50.0000 | |
| S7 | Spherical surface | Go to nothing | 0.2100 | 1.52/64.2 | |
| S8 | Spherical surface | All-round | 0.4000 | ||
| S9 | Spherical surface | Go to nothing |
TABLE 1
As can be seen from table 1, the axial distance SL between the stop STO and the image forming surface S9 of the iris lens and the axial distance TTL between the object-side surface S1 of the first lens L1 and the image forming surface S9 of the iris lens satisfy SL/TTL of 0.87; the central thickness CT1 of the first lens L1 on the optical axis, the central thickness CT2 of the second lens L2 on the optical axis, and the central thickness CT3 of the third lens L3 on the optical axis satisfy CT1/(CT2+ CT3) ═ 1.15; the central thickness CT1 of the first lens L1 on the optical axis and the central thickness CT2 of the second lens L2 on the optical axis satisfy CT1/CT 2-2.55; the first lens element L1 through the third lens element L3 respectively satisfy Σ CT/TTL of 0.33 between the center thickness sum Σ CT on the optical axis and the on-axis distance TTL from the object-side surface S1 of the first lens element L1 to the image plane S9 of the iris lens.
In the embodiment, three lenses are taken as an example, and the total length of the lens is effectively shortened by reasonably distributing the focal length and the surface type of each lens, so that the compact structure is ensured, and the identification precision is improved; meanwhile, various aberrations are corrected, and the resolution and the imaging quality of the lens are improved. Each aspherical surface type x is defined by the following formula:
wherein x is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1 above); ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S6 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 1.0254E-02 | 3.0138E-02 | -3.1064E-02 | -1.6727E-01 | 2.2603E+00 | -8.4740E+00 | 1.6178E+01 | -1.5686E+01 | 6.2594E+00 |
| S2 | 1.7691E-02 | -1.0452E-01 | 1.2123E+00 | -8.7076E+00 | 3.8492E+01 | -1.0662E+02 | 1.8009E+02 | -1.6931E+02 | 6.8147E+01 |
| S3 | -8.0842E-01 | 7.7994E+00 | -8.7707E+01 | 7.8480E+02 | -5.2582E+03 | 2.3632E+04 | -6.5712E+04 | 9.9793E+04 | -6.1409E+04 |
| S4 | 4.8225E-01 | 6.7030E-01 | -1.8222E+01 | 2.1924E+02 | -1.7178E+03 | 8.5381E+03 | -2.5903E+04 | 4.3625E+04 | -3.1188E+04 |
| S5 | 5.5793E-02 | -2.4684E-01 | 1.7817E+00 | -7.1271E+00 | 1.7385E+01 | -2.4781E+01 | 1.9027E+01 | -6.2447E+00 | 1.8396E-01 |
| S6 | -7.1242E-02 | 1.1030E-01 | -1.3744E+00 | 6.7488E+00 | -1.9091E+01 | 3.2878E+01 | -3.3786E+01 | 1.8989E+01 | -4.4811E+00 |
TABLE 2
Table 3 below gives the total effective focal length f of the iris lens of example 1, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL from the object side surface S1 to the imaging surface S9 of the first lens L1, and half the diagonal length ImgH of the effective pixel region on the imaging surface S9.
| Parameter(s) | f(mm) | f1(mm) | f2(mm) | f3(mm) | TTL(mm) | ImgH(mm) |
| Numerical value | 3.98 | 2.45 | -3.58 | -11.90 | 3.50 | 1.40 |
TABLE 3
As can be seen from table 3, TTL/ImgH of 2.50 is satisfied between the on-axis distance TTL from the object-side surface S1 of the first lens element L1 to the image plane S9 and half ImgH of the diagonal length of the effective pixel region on the image plane S9; an axial distance TTL between the object-side surface S1 of the first lens element L1 and the imaging surface S9 and a total effective focal length f of the iris lens satisfy TTL/f equal to 0.88; f1/f2 of 3.51 is satisfied between the effective focal length f1 of the first lens L1 and the effective focal length f2 of the second lens L2. As can be seen from tables 1 and 3, R2/f1 is 1.31 between the radius of curvature R2 of the image-side surface S2 of the first lens L1 and the effective focal length f1 of the first lens L1.
In addition, in the present embodiment, an on-axis distance SAG32 between an intersection point of the image-side surface S6 of the third lens L3 and the optical axis and an effective radius vertex of the image-side surface S6 of the third lens L3 and a central thickness CT3 of the third lens L3 on the optical axis satisfies | SAG32/CT3| ═ 0.14; DT11/DT22 can be equal to 1.53 between the effective radius DT11 of the object-side surface S1 of the first lens L1 and the effective radius DT22 of the image-side surface S4 of the second lens L2.
Fig. 2A shows an axial chromatic aberration curve of the iris lens of embodiment 1, which represents deviation of convergence focuses of light rays of different wavelengths after passing through the iris lens. Fig. 2B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the iris lens of embodiment 1. Fig. 2C shows a distortion curve of the iris lens of embodiment 1, which represents the distortion magnitude values in the case of different viewing angles. Fig. 2D shows a chromatic aberration of magnification curve of the iris lens of embodiment 1, which represents a deviation of different image heights on an image plane after light passes through the iris lens. As can be seen from fig. 2A to 2D, the iris lens according to embodiment 1 can achieve good imaging quality.
Example 2
An iris lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an iris lens according to embodiment 2 of the present application.
As shown in fig. 3, the iris lens includes three lenses L1-L3 arranged in order from the object side to the image plane along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; and the third lens L3 has an object-side surface S5 and an image-side surface S6. Optionally, the iris lens may further include a filter L4 having an object-side surface S7 and an image-side surface S8. The filter L4 is an IR infrared filter with a bandpass band of about 750nm to about 900nm, and further with a bandpass band of about 790nm to about 830 nm. In the iris lens of the present embodiment, an aperture stop STO for limiting a light beam may be further provided between the object side and the first lens L1 to improve the imaging quality of the iris lens. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging surface S9.
Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the iris lens in example 2. Table 5 shows the coefficients A of the high-order terms which can be used for the aspherical mirrors S1 to S6 in example 2 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 . Table 6 shows the total effective focal length f of the iris lens of example 2, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL from the object side surface S1 of the first lens L1 to the imaging surface S9, and half ImgH of the diagonal length of the effective pixel region on the imaging surface S9. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Coefficient of cone |
| OBJ | Spherical surface | All-round | 500.0000 | ||
| STO | Spherical surface | All-round | -0.4527 | ||
| S1 | Aspherical surface | 0.9750 | 0.6147 | 1.53/55.8 | -0.1722 |
| S2 | Aspherical surface | 3.1253 | 0.7123 | 10.4413 | |
| S3 | Aspherical surface | -2.3178 | 0.2400 | 1.62/23.5 | -94.1421 |
| S4 | Aspherical surface | All-round | 0.6034 | -99.0000 | |
| S5 | Aspherical surface | -5.6195 | 0.3126 | 1.53/55.8 | -34.0553 |
| S6 | Aspherical surface | All-round | 0.4075 | -99.0000 | |
| S7 | Spherical surface | All-round | 0.2100 | 1.52/64.2 | |
| S8 | Spherical surface | All-round | 0.4043 | ||
| S9 | Spherical surface | All-round |
TABLE 4
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 1.0130E-02 | 3.1592E-02 | -5.9786E-02 | 5.8256E-02 | 1.3141E+00 | -6.1681E+00 | 1.2893E+01 | -1.3136E+01 | 5.4189E+00 |
| S2 | 1.4527E-02 | -8.1497E-02 | 7.9280E-01 | -5.0532E+00 | 1.9699E+01 | -4.8443E+01 | 7.3027E+01 | -6.1545E+01 | 2.2386E+01 |
| S3 | -8.2320E-01 | 7.6169E+00 | -8.2851E+01 | 7.2191E+02 | -4.7303E+03 | 2.0741E+04 | -5.5860E+04 | 8.0920E+04 | -4.5940E+04 |
| S4 | 4.6484E-01 | 6.8695E-01 | -1.6727E+01 | 1.9414E+02 | -1.4766E+03 | 7.1504E+03 | -2.1210E+04 | 3.5033E+04 | -2.4621E+04 |
| S5 | 3.7363E-02 | -1.6890E-01 | 1.5377E+00 | -7.3089E+00 | 2.1522E+01 | -3.8487E+01 | 4.0585E+01 | -2.3160E+01 | 5.5097E+00 |
| S6 | -5.2140E-02 | -1.5707E-01 | 7.3896E-01 | -2.5958E+00 | 5.6549E+00 | -7.3791E+00 | 5.5833E+00 | -2.2318E+00 | 3.6138E-01 |
TABLE 5
| Parameter(s) | f(mm) | f1(mm) | f2(mm) | f3(mm) | TTL(mm) | ImgH(mm) |
| Numerical value | 3.97 | 2.44 | -3.73 | -10.64 | 3.50 | 1.40 |
TABLE 6
Fig. 4A shows an on-axis chromatic aberration curve of the iris lens of embodiment 2, which represents the deviation of the convergence focus of light rays of different wavelengths after passing through the iris lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the iris lens of embodiment 2. Fig. 4C shows a distortion curve of the iris lens of embodiment 2, which represents the distortion magnitude values in the case of different viewing angles. Fig. 4D shows a chromatic aberration of magnification curve of the iris lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after the light passes through the iris lens. As can be seen from fig. 4A to 4D, the iris lens according to embodiment 2 can achieve good imaging quality.
Example 3
An iris lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural diagram of an iris lens according to embodiment 3 of the present application.
As shown in fig. 5, the iris lens includes three lenses L1-L3 arranged in order from the object side to the image plane along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6. Optionally, the iris lens may further include a filter L4 having an object-side surface S7 and an image-side surface S8. The filter L4 is an IR infrared filter with a band pass band of about 750nm to about 900nm, and further with a band pass band of about 790nm to about 830 nm. In the iris lens of the present embodiment, an aperture stop STO for limiting a light beam may be further provided between the object side and the first lens L1 to improve the imaging quality of the iris lens. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging surface S9.
Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the iris lens in example 3. Table 8 shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 through S6 in example 3 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 . Table 9 shows the total effective focal length f of the iris lens of example 3, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL from the object side surface S1 of the first lens L1 to the imaging surface S9, and half ImgH of the diagonal length of the effective pixel region on the imaging surface S9.Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 7
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 1.0229E-02 | 3.2835E-02 | -7.8157E-02 | 2.0314E-01 | 6.7879E-01 | -4.5194E+00 | 1.0374E+01 | -1.1039E+01 | 4.6803E+00 |
| S2 | 1.4488E-02 | -7.8860E-02 | 7.5269E-01 | -4.7719E+00 | 1.8486E+01 | -4.5306E+01 | 6.8136E+01 | -5.7281E+01 | 2.0726E+01 |
| S3 | -8.4271E-01 | 7.9031E+00 | -8.5539E+01 | 7.3987E+02 | -4.8072E+03 | 2.0907E+04 | -5.5820E+04 | 7.9951E+04 | -4.4546E+04 |
| S4 | 4.7174E-01 | 6.1824E-01 | -1.5468E+01 | 1.8084E+02 | -1.3921E+03 | 6.8242E+03 | -2.0468E+04 | 3.4131E+04 | -2.4183E+04 |
| S5 | 4.3473E-02 | -2.0655E-01 | 1.7419E+00 | -8.1405E+00 | 2.3664E+01 | -4.1896E+01 | 4.3834E+01 | -2.4857E+01 | 5.8834E+00 |
| S6 | -4.4013E-02 | -1.6813E-01 | 7.4294E-01 | -2.5475E+00 | 5.4657E+00 | -7.0315E+00 | 5.2374E+00 | -2.0555E+00 | 3.2601E-01 |
TABLE 8
| Parameter(s) | f(mm) | f1(mm) | f2(mm) | f3(mm) | TTL(mm) | ImgH(mm) |
| Numerical value | 3.97 | 2.44 | -3.76 | -10.45 | 3.50 | 1.40 |
TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve of the iris lens of embodiment 3, which represents the deviation of the convergence focus of light rays of different wavelengths after passing through the iris lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the iris lens of embodiment 3. Fig. 6C shows a distortion curve of the iris lens of embodiment 3, which represents the distortion magnitude values in the case of different viewing angles. Fig. 6D shows a chromatic aberration of magnification curve of the iris lens of embodiment 3, which represents a deviation of different image heights on the image plane after the light passes through the iris lens. As can be seen from fig. 6A to 6D, the iris lens according to embodiment 3 can achieve good imaging quality.
Example 4
An iris lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic structural diagram of an iris lens according to embodiment 4 of the present application.
As shown in fig. 7, the iris lens includes three lenses L1-L3 arranged in order from an object side to an image plane along an optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6. Optionally, the iris lens may further include a filter L4 having an object-side surface S7 and an image-side surface S8. The filter L4 is an IR infrared filter with a band pass band of about 750nm to about 900nm, and further with a band pass band of about 790nm to about 830 nm. In the iris lens of the present embodiment, an aperture stop STO for limiting a light beam may be further provided between the object side and the first lens L1 to improve the imaging quality of the iris lens. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging surface S9.
Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the iris lens in example 4. Table 11 shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 through S6 in example 4 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 . Table 12 shows the total effective focal length f of the iris lens of example 4, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL from the object side surface S1 of the first lens L1 to the imaging surface S9, and half ImgH of the diagonal length of the effective pixel region on the imaging surface S9. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Coefficient of cone |
| OBJ | Spherical surface | All-round | 260.0000 | ||
| STO | Spherical surface | All-round | -0.4827 | ||
| S1 | Aspherical surface | 1.0586 | 0.6544 | 1.53/55.8 | -0.1971 |
| S2 | Aspherical surface | 3.9977 | 0.7161 | 11.1786 | |
| S3 | Aspherical surface | -2.1496 | 0.3431 | 1.62/23.5 | -98.9559 |
| S4 | Aspherical surface | -17.3495 | 0.5190 | -99.0000 | |
| S5 | Aspherical surface | 8.0787 | 0.3890 | 1.53/55.8 | 19.8781 |
| S6 | Aspherical surface | 3.9131 | 0.4684 | -5.3078 | |
| S7 | Spherical surface | All-round | 0.2100 | 1.52/64.2 | |
| S8 | Spherical surface | All-round | 0.4000 | ||
| S9 | Spherical surface | All-round |
Watch 10
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 1.2319E-02 | 3.7947E-02 | -1.9381E-01 | 1.0504E+00 | -3.2546E+00 | 6.3644E+00 | -7.5661E+00 | 5.0445E+00 | -1.4481E+00 |
| S2 | 3.0785E-02 | -2.2630E-02 | 1.2698E-01 | -4.5658E-01 | 6.0715E-01 | 3.3300E-01 | -2.4165E+00 | 3.1320E+00 | -1.4695E+00 |
| S3 | -9.9775E-01 | 1.1166E+01 | -1.1312E+02 | 8.7393E+02 | -4.9069E+03 | 1.8679E+04 | -4.5100E+04 | 6.1734E+04 | -3.6244E+04 |
| S4 | 5.4455E-01 | -4.7677E-01 | 3.5692E+00 | -3.3203E+01 | 1.6372E+02 | -4.3542E+02 | 5.3015E+02 | -4.6745E+01 | -3.2393E+02 |
| S5 | 1.5565E-01 | -5.2177E-01 | 2.1161E+00 | -6.7654E+00 | 1.5131E+01 | -2.1955E+01 | 1.9517E+01 | -9.6009E+00 | 1.9932E+00 |
| S6 | 4.9992E-02 | -5.6897E-01 | 2.0109E+00 | -4.9764E+00 | 8.1370E+00 | -8.3543E+00 | 5.0476E+00 | -1.5656E+00 | 1.7394E-01 |
TABLE 11
| Parameter(s) | f(mm) | f1(mm) | f2(mm) | f3(mm) | TTL(mm) | ImgH(mm) |
| Numerical value | 3.94 | 2.53 | -3.98 | -14.84 | 3.70 | 1.40 |
TABLE 12
Fig. 8A shows an on-axis chromatic aberration curve of the iris lens of embodiment 4, which represents the deviation of the convergence focus of light rays of different wavelengths after passing through the iris lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the iris lens of example 4. Fig. 8C shows a distortion curve of the iris lens of example 4, which represents the distortion magnitude values in the case of different viewing angles. Fig. 8D shows a chromatic aberration of magnification curve of the iris lens of embodiment 4, which represents a deviation of different image heights on the image plane after the light passes through the iris lens. As can be seen from fig. 8A to 8D, the iris lens according to embodiment 4 can achieve good imaging quality.
Example 5
An iris lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural diagram of an iris lens according to embodiment 5 of the present application.
As shown in fig. 9, the iris lens includes three lenses L1-L3 arranged in order from the object side to the image plane along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6. Optionally, the iris lens may further include a filter L4 having an object-side surface S7 and an image-side surface S8. The filter L4 is an IR infrared filter with a band pass band of about 750nm to about 900nm, and further with a band pass band of about 790nm to about 830 nm. In the iris lens of the present embodiment, an aperture stop STO for limiting a light beam may be further provided between the object side and the first lens L1 to improve the imaging quality of the iris lens. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging surface S9.
Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the iris lens in example 5. Table 14 shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 through S6 in example 5 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 . Table 15 shows the total effective focal length f of the iris lens of example 5, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL from the object-side surface S1 of the first lens L1 to the imaging surface S9, and the presence of the lens on the imaging surface S9ImgH is half the diagonal length of the effective pixel area. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Coefficient of cone |
| OBJ | Spherical surface | All-round | 260.0000 | ||
| STO | Spherical surface | All-round | -0.5256 | ||
| S1 | Aspherical surface | 1.0644 | 0.7075 | 1.53/55.8 | -0.1853 |
| S2 | Aspherical surface | 3.3249 | 0.7924 | 9.7285 | |
| S3 | Aspherical surface | -2.5045 | 0.2400 | 1.62/23.5 | -78.1820 |
| S4 | Aspherical surface | -16.2944 | 0.6220 | 50.0000 | |
| S5 | Aspherical surface | -7.5709 | 0.3199 | 1.62/23.5 | 39.3841 |
| S6 | Aspherical surface | 23.9415 | 0.4083 | -99.0000 | |
| S7 | Spherical surface | All-round | 0.2100 | 1.52/64.2 | |
| S8 | Spherical surface | All-round | 0.4044 | ||
| S9 | Spherical surface | All-round |
Watch 13
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 6.4373E-03 | 1.1060E-02 | 1.0444E-02 | -1.0068E-01 | 6.1096E-01 | -1.6940E+00 | 2.5970E+00 | -2.0708E+00 | 6.8751E-01 |
| S2 | 8.5637E-03 | -5.3013E-02 | 4.5690E-01 | -2.4941E+00 | 8.1190E+00 | -1.6155E+01 | 1.9035E+01 | -1.2033E+01 | 3.1188E+00 |
| S3 | -5.4988E-01 | 2.5925E+00 | -7.3881E+00 | -8.4448E+01 | 1.2391E+03 | -7.9092E+03 | 2.7989E+04 | -5.2971E+04 | 4.1800E+04 |
| S4 | 2.9879E-01 | 3.7091E-01 | -5.6792E+00 | 5.5719E+01 | -3.6700E+02 | 1.5390E+03 | -3.9560E+03 | 5.6648E+03 | -3.4498E+03 |
| S5 | -6.2743E-02 | -1.7467E-01 | 2.1395E+00 | -9.2376E+00 | 2.3462E+01 | -3.6013E+01 | 3.2593E+01 | -1.5920E+01 | 3.2208E+00 |
| S6 | -1.5806E-01 | 7.1017E-02 | -1.6705E-01 | 7.1681E-01 | -2.2253E+00 | 4.0323E+00 | -4.1462E+00 | 2.2389E+00 | -4.9156E-01 |
TABLE 14
| Parameter(s) | f(mm) | f1(mm) | f2(mm) | f3(mm) | TTL(mm) | ImgH(mm) |
| Numerical value | 4.08 | 2.67 | -4.79 | -9.21 | 3.70 | 1.45 |
Watch 15
Fig. 10A shows on-axis chromatic aberration curves of the iris lens of embodiment 5, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the iris lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the iris lens of example 5. Fig. 10C shows a distortion curve of the iris lens of example 5, which represents the distortion magnitude values in the case of different viewing angles. Fig. 10D shows a chromatic aberration of magnification curve of the iris lens of example 5, which represents a deviation of different image heights on the image plane after the light passes through the iris lens. As can be seen from fig. 10A to 10D, the iris lens according to embodiment 5 can achieve good imaging quality.
Example 6
An iris lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 is a schematic view showing a structure of an iris lens according to embodiment 6 of the present application.
As shown in fig. 11, the iris lens includes three lenses L1-L3 arranged in order from the object side to the image plane along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6. Optionally, the iris lens may further include a filter L4 having an object-side surface S7 and an image-side surface S8. The filter L4 is an IR infrared filter with a band pass band of about 750nm to about 900nm, and further with a band pass band of about 790nm to about 830 nm. In the iris lens of the present embodiment, an aperture stop STO for limiting a light beam may be further provided between the object side and the first lens L1 to improve the imaging quality of the iris lens. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging surface S9.
Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the iris lens in example 6. Table 17 shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 through S6 in example 6 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 . Table 18 shows the total effective focal length f of the iris lens of example 6, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL from the object side surface S1 of the first lens L1 to the imaging surface S9, and half ImgH of the diagonal length of the effective pixel region on the imaging surface S9. Wherein each aspherical surface type can be defined by formula (1) given in embodiment 1 above.
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Coefficient of cone |
| OBJ | Spherical surface | Go to nothing | 260.0000 | ||
| STO | Spherical surface | All-round | -0.5406 | ||
| S1 | Aspherical surface | 1.0428 | 0.6833 | 1.53/55.8 | -0.1928 |
| S2 | Aspherical surface | 3.2176 | 0.8420 | 8.0953 | |
| S3 | Aspherical surface | -3.9183 | 0.2400 | 1.62/23.5 | -24.2360 |
| S4 | Aspherical surface | 3.5788 | 0.4526 | -99.0000 | |
| S5 | Aspherical surface | 5.2361 | 0.4099 | 1.53/55.8 | -22.9938 |
| S6 | Aspherical surface | 5.5719 | 0.4623 | 14.1828 | |
| S7 | Spherical surface | Go to nothing | 0.2100 | 1.52/64.2 | |
| S8 | Spherical surface | All-round | 0.4044 | ||
| S9 | Spherical surface | All-round |
TABLE 16
TABLE 17
| Parameter(s) | f(mm) | f1(mm) | f2(mm) | f3(mm) | TTL(mm) | ImgH(mm) |
| Numerical value | 4.08 | 2.63 | -2.97 | 115.63 | 3.70 | 1.45 |
Watch 18
Fig. 12A shows on-axis chromatic aberration curves of the iris lens of embodiment 6, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the iris lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the iris lens of example 6. Fig. 12C shows a distortion curve of the iris lens of example 6, which represents the distortion magnitude values in the case of different viewing angles. Fig. 12D shows a chromatic aberration of magnification curve of the iris lens of example 6, which represents a deviation of different image heights on the image plane after the light passes through the iris lens. As can be seen from fig. 12A to 12D, the iris lens according to embodiment 6 can achieve good imaging quality.
Example 7
An iris lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 is a schematic view showing a structure of an iris lens according to embodiment 7 of the present application.
As shown in fig. 13, the iris lens includes three lenses L1-L3 arranged in order from the object side to the image plane along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6. Optionally, the iris lens may further include a filter L4 having an object-side surface S7 and an image-side surface S8. The filter L4 is an IR infrared filter with a band pass band of about 750nm to about 900nm, and further with a band pass band of about 790nm to about 830 nm. In the iris lens of the present embodiment, an aperture stop STO for limiting a light beam may be further provided between the object side and the first lens L1 to improve the imaging quality of the iris lens. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging surface S9.
Table 19 shows the surface type, radius of curvature, and thickness of each lens of the iris lens in example 7Material and cone coefficient. Table 20 shows the high-order term coefficients A that can be used for the aspherical mirrors S1 to S6 in example 7 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 . Table 21 shows the total effective focal length f of the iris lens of example 7, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL from the object side surface S1 to the imaging surface S9 of the first lens L1, and half the diagonal length ImgH of the effective pixel region on the imaging surface S9. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Coefficient of cone |
| OBJ | Spherical surface | Go to nothing | 260.0000 | ||
| STO | Spherical surface | All-round | -0.5217 | ||
| S1 | Aspherical surface | 1.0577 | 0.6698 | 1.53/55.8 | -0.1987 |
| S2 | Aspherical surface | 3.2937 | 0.8261 | 7.9914 | |
| S3 | Aspherical surface | 109.1388 | 0.2400 | 1.62/23.5 | 50.0000 |
| S4 | Aspherical surface | 1.9937 | 0.4977 | -39.8432 | |
| S5 | Aspherical surface | 19.2516 | 0.4205 | 1.53/55.8 | -99.0000 |
| S6 | Aspherical surface | 11.9956 | 0.4359 | -11.3624 | |
| S7 | Spherical surface | All-round | 0.2100 | 1.52/64.2 | |
| S8 | Spherical surface | All-round | 0.4043 | ||
| S9 | Spherical surface | All-round |
Watch 19
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 6.9669E-03 | -5.4172E-03 | 9.8510E-02 | -3.1669E-01 | 5.7546E-01 | -5.1187E-01 | 1.8913E-01 | 0.0000E+00 | 0.0000E+00 |
| S2 | -1.6236E-03 | 1.1014E-02 | -1.3186E-01 | 3.8565E-01 | -6.3021E-01 | 5.0268E-01 | -1.6002E-01 | 0.0000E+00 | 0.0000E+00 |
| S3 | -3.2833E-01 | -6.0600E-02 | -3.6752E+00 | 1.0216E+01 | 1.6359E+02 | -2.0617E+03 | 9.9725E+03 | -2.3013E+04 | 2.0915E+04 |
| S4 | 5.7321E-01 | -2.3752E+00 | 7.3030E+00 | -2.0133E+00 | -1.3303E+02 | 7.5692E+02 | -2.0879E+03 | 2.9933E+03 | -1.7764E+03 |
| S5 | -6.4829E-02 | 7.4466E-03 | 5.5089E-01 | -1.8560E+00 | 3.8020E+00 | -5.0604E+00 | 4.0427E+00 | -1.7219E+00 | 2.9596E-01 |
| S6 | -1.5443E-01 | 4.4545E-02 | -1.4403E-01 | 5.4358E-01 | -1.2133E+00 | 1.6117E+00 | -1.2748E+00 | 5.4630E-01 | -9.6715E-02 |
Watch 20
| Parameter(s) | f(mm) | f1(mm) | f2(mm) | f3(mm) | TTL(mm) | ImgH(mm) |
| Numerical value | 4.08 | 2.67 | -3.27 | -61.48 | 3.70 | 1.45 |
TABLE 21
Fig. 14A shows an on-axis chromatic aberration curve of the iris lens of example 7, which represents the deviation of the convergence focus of light rays of different wavelengths after passing through the iris lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the iris lens of example 7. Fig. 14C shows a distortion curve of the iris lens of embodiment 7, which represents the distortion magnitude values in the case of different viewing angles. Fig. 14D shows a chromatic aberration of magnification curve of the iris lens of example 7, which represents a deviation of different image heights on the image plane after the light passes through the iris lens. As can be seen from fig. 14A to 14D, the iris lens according to embodiment 7 can achieve good imaging quality.
Example 8
An iris lens according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 is a schematic structural diagram of an iris lens according to embodiment 8 of the present application.
As shown in fig. 15, the iris lens includes three lenses L1-L3 arranged in order from the object side to the image plane along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; and the third lens L3 has an object-side surface S5 and an image-side surface S6. Optionally, the iris lens may further include a filter L4 having an object-side surface S7 and an image-side surface S8. The filter L4 is an IR infrared filter with a band pass band of about 750nm to about 900nm, and further with a band pass band of about 790nm to about 830 nm. In the iris lens of the present embodiment, an aperture stop STO for limiting a light beam may be further provided between the object side and the first lens L1 to improve the imaging quality of the iris lens. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging surface S9.
Table 22 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the iris lens in example 8. Table 23 shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 through S6 in example 8 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 . Table 24 shows the total effective focal length f of the iris lens of example 8, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL from the object side surface S1 of the first lens L1 to the imaging surface S9, and half ImgH of the diagonal length of the effective pixel region on the imaging surface S9. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Coefficient of cone |
| OBJ | Spherical surface | All-round | 260.0000 | ||
| STO | Spherical surface | All-round | 0.2000 | ||
| S1 | Aspherical surface | 1.0797 | 0.6526 | 1.53/55.8 | -0.1889 |
| S2 | Aspherical surface | 3.3396 | 0.8187 | 8.1297 | |
| S3 | Aspherical surface | -4.9229 | 0.2400 | 1.53/55.8 | -87.1979 |
| S4 | Aspherical surface | 5.5747 | 0.6385 | -99.0000 | |
| S5 | Aspherical surface | -8.8702 | 0.3307 | 1.53/55.8 | 49.9990 |
| S6 | Aspherical surface | 16.5497 | 0.4095 | -99.0000 | |
| S7 | Spherical surface | All-round | 0.2100 | 1.52/64.2 | |
| S8 | Spherical surface | All-round | 0.4051 | ||
| S9 | Spherical surface | All-round |
TABLE 22
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 8.0611E-03 | -1.8992E-02 | 1.8570E-01 | -5.8486E-01 | 1.0407E+00 | -9.3072E-01 | 3.4685E-01 | 0.0000E+00 | 0.0000E+00 |
| S2 | -2.2001E-03 | 1.9288E-02 | -1.3183E-01 | 3.8266E-01 | -6.2426E-01 | 5.1899E-01 | -1.6220E-01 | 0.0000E+00 | 0.0000E+00 |
| S3 | -3.2833E-01 | -6.0600E-02 | -3.6752E+00 | 1.0216E+01 | 1.6359E+02 | -2.0617E+03 | 9.9725E+03 | -2.3013E+04 | 2.0915E+04 |
| S4 | 5.7321E-01 | -2.3752E+00 | 7.3030E+00 | -2.0133E+00 | -1.3303E+02 | 7.5692E+02 | -2.0879E+03 | 2.9933E+03 | -1.7764E+03 |
| S5 | -6.4829E-02 | 7.4466E-03 | 5.5089E-01 | -1.8560E+00 | 3.8020E+00 | -5.0604E+00 | 4.0427E+00 | -1.7219E+00 | 2.9596E-01 |
| S6 | -1.5443E-01 | 4.4545E-02 | -1.4403E-01 | 5.4358E-01 | -1.2133E+00 | 1.6117E+00 | -1.2748E+00 | 5.4630E-01 | -9.6715E-02 |
TABLE 23
| Parameter(s) | f(mm) | f1(mm) | f2(mm) | f3(mm) | TTL(mm) | ImgH(mm) |
| Numerical value | 4.07 | 2.75 | -4.91 | -10.88 | 3.71 | 1.45 |
Watch 24
Fig. 16A shows an on-axis chromatic aberration curve of the iris lens of embodiment 8, which represents the deviation of the convergence focus of light rays of different wavelengths after passing through the iris lens. Fig. 16B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the iris lens of example 8. Fig. 16C shows a distortion curve of the iris lens of embodiment 8, which represents the distortion magnitude values in the case of different viewing angles. Fig. 16D shows a chromatic aberration of magnification curve of the iris lens of example 8, which represents a deviation of different image heights on the image plane after the light passes through the iris lens. As can be seen from fig. 16A to 16D, the iris lens according to embodiment 8 can achieve good imaging quality.
In summary, examples 1 to 8 each satisfy the relationship shown in table 25 below.
| Conditional expression (A) example | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| SL/TTL | 0.87 | 0.87 | 0.87 | 0.87 | 0.86 | 0.85 | 0.86 | 1.05 |
| CT1/(CT2+CT3) | 1.15 | 1.11 | 1.12 | 0.89 | 1.26 | 1.05 | 1.01 | 1.14 |
| TTL/ImgH | 2.50 | 2.50 | 2.50 | 2.64 | 2.56 | 2.56 | 2.56 | 2.56 |
| TTL/f | 0.88 | 0.88 | 0.88 | 0.94 | 0.91 | 0.91 | 0.91 | 0.91 |
| CT1/CT2 | 2.55 | 2.56 | 2.57 | 1.91 | 2.95 | 2.85 | 2.79 | 2.72 |
| ∑CT/TTL | 0.33 | 0.33 | 0.33 | 0.37 | 0.34 | 0.36 | 0.36 | 0.33 |
| R2/f1 | 1.31 | 1.28 | 1.27 | 1.58 | 1.24 | 1.22 | 1.23 | 1.22 |
| |SAG32/CT3| | 0.14 | 0.26 | 0.27 | 0.20 | 0.46 | 0.16 | 0.36 | 0.72 |
| f1/f2 | -0.68 | -0.66 | -0.65 | -0.64 | -0.56 | -0.89 | -0.82 | -0.56 |
| DT11/DT22 | 1.53 | 1.50 | 1.50 | 1.51 | 1.55 | 1.47 | 1.51 | 1.56 |
TABLE 25
The present application also provides an image pickup apparatus, wherein the photosensitive element may be a photosensitive coupling element (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). The camera device may be a stand-alone camera device such as a digital camera, or may be a camera module integrated on a mobile electronic device such as a mobile phone. The image pickup apparatus is equipped with the iris lens described above.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (28)
1. An iris lens having a total effective focal length f, the iris lens comprising, in order from an object side to an image plane along an optical axis: an aperture stop, a first lens, a second lens, and a third lens,
it is characterized in that the preparation method is characterized in that,
the first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has a negative optical power;
the third lens has positive optical power or negative optical power;
the distance TTL between the object side surface of the first lens and the imaging surface on the optical axis and the total effective focal length f meet the condition that TTL/f is more than or equal to 0.88 and less than 1.1;
the image side surface of the first lens is concave, and the curvature radius R2 of the image side surface of the first lens and the effective focal length f1 of the first lens meet the condition that 1.2< R2/f1< 1.7;
the distance SL from the aperture diaphragm to the imaging surface on the optical axis meets the condition that SL/TTL is more than or equal to 0.85 and less than 1.25;
the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy 1.91 ≤ CT1/CT2< 3; and
the number of lenses of the iris lens with focal power is three.
2. The iris lens as claimed in claim 1, wherein a central thickness CT1 of the first lens element on the optical axis, a central thickness CT2 of the second lens element on the optical axis and a central thickness CT3 of the third lens element on the optical axis satisfy 0.8< CT1/(CT2+ CT3) < 1.3.
3. The iris lens of claim 1, wherein a distance TTL between an object side surface of the first lens element and the imaging surface on the optical axis and a half ImgH of a diagonal length of an effective pixel area of an electronic photosensitive element on the imaging surface satisfy TTL/ImgH ≦ 2.65.
4. The iris lens as claimed in claim 1, wherein a sum Σ CT of central thicknesses of said first lens element to said third lens element on said optical axis and a distance TTL between an object side surface of said first lens element and said image plane on said optical axis satisfy Σ CT/TTL <0.4, respectively.
5. The iris lens of claim 1, wherein a distance SAG32 on the optical axis between an intersection of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens and a central thickness CT3 of the third lens on the optical axis satisfy 0.1< | SAG32/CT3| < 0.8.
6. The iris lens of claim 1, wherein the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy-0.9 < f1/f2< -0.2.
7. The iris lens as claimed in claim 1, wherein an effective radius DT11 of an object-side surface of the first lens and an effective radius DT22 of an image-side surface of the second lens satisfy 1.2< DT11/DT22< 1.8.
8. An iris lens as claimed in any one of claims 1 to 7, further comprising an IR infrared filter disposed between the third lens and the imaging surface, and having a band pass band of 750nm to 900 nm.
9. The iris lens as claimed in claim 8, wherein the band pass band of the IR infrared filter is 790 to 830 nm.
10. The iris lens sequentially comprises from an object side to an imaging surface along an optical axis: an aperture stop, a first lens, a second lens, and a third lens,
it is characterized in that the preparation method is characterized in that,
the first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has a negative optical power,
the third lens has positive power or negative power;
the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy 1.91 ≦ CT1/CT2< 3; and
the image side surface of the first lens is concave, and the curvature radius R2 of the image side surface of the first lens and the effective focal length f1 of the first lens meet the condition that 1.2< R2/f1< 1.7;
the distance SL from the aperture diaphragm to the imaging surface on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface on the optical axis satisfy that SL/TTL is more than or equal to 0.85 and less than 1.25; and
the number of lenses of the iris lens with focal power is three.
11. The iris lens of claim 10, wherein a distance TTL between an object side surface of the first lens element and the imaging surface on the optical axis and a half ImgH of a diagonal length of an effective pixel area of an electronic photosensitive element on the imaging surface satisfy TTL/ImgH ≦ 2.65.
12. The iris lens as claimed in claim 11, wherein a distance TTL between an object side surface of the first lens element and the image plane on the optical axis and the total effective focal length f satisfy 0.7< TTL/f < 1.1.
13. An iris lens as claimed in claim 11, wherein a central thickness CT1 of the first lens element on the optical axis, a central thickness CT2 of the second lens element on the optical axis and a central thickness CT3 of the third lens element on the optical axis satisfy 0.8< CT1/(CT2+ CT3) < 1.3.
14. The iris lens of claim 11, wherein a sum Σ CT of center thicknesses on the optical axis of the first lens element to the third lens element and a distance TTL on the optical axis from an object side surface of the first lens element to the image plane satisfy Σ CT/TTL < 0.4.
15. The iris lens as claimed in claim 11, wherein a distance SAG32 on the optical axis between an intersection of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens and a central thickness CT3 of the third lens on the optical axis satisfy 0.1< | SAG32/CT3| < 0.8.
16. The iris lens of claim 11, wherein the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy-0.9 < f1/f2< -0.2.
17. The iris lens as claimed in claim 11, wherein an effective radius DT11 of an object-side surface of the first lens and an effective radius DT22 of an image-side surface of the second lens satisfy 1.2< DT11/DT22< 1.8.
18. An iris lens as claimed in claim 11, further comprising an IR infrared filter disposed between the third lens and the image plane, and having a band pass band of 750nm to 900 nm.
19. The iris lens as claimed in claim 18, wherein the band pass band of the IR infrared filter is 790 to 830 nm.
20. The iris lens sequentially comprises from an object side to an imaging surface along an optical axis: an aperture stop, a first lens, a second lens, and a third lens,
it is characterized in that the preparation method is characterized in that,
the first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has a negative optical power;
the third lens has positive power or negative power;
a distance SAG32 on the optical axis between an intersection point of an image-side surface of the third lens and the optical axis and an effective radius vertex of the image-side surface of the third lens and a central thickness CT3 of the third lens on the optical axis satisfy 0.14 ≦ SAG32/CT3| < 0.8; and
the image side surface of the first lens is concave, and the curvature radius R2 of the image side surface of the first lens and the effective focal length f1 of the first lens meet 1.2< R2/f1< 1.7;
the distance SL from the aperture diaphragm to the imaging surface on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface on the optical axis satisfy that SL/TTL is more than or equal to 0.85 and less than 1.25;
the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy 1.91 ≤ CT1/CT2< 3; and
the number of lenses of the iris lens with focal power is three.
21. An iris lens as claimed in claim 20, further comprising an IR infrared filter disposed between the third lens and the image plane and having a band pass band of 750nm to 900 nm.
22. The iris lens as claimed in claim 21, wherein the band pass band of the IR infrared filter is 790 to 830 nm.
23. The iris lens as claimed in claim 21, wherein a sum Σ CT of central thicknesses of said first lens element to said third lens element on said optical axis and a distance TTL between an object side surface of said first lens element and said image plane on said optical axis satisfy Σ CT/TTL <0.4, respectively.
24. An iris lens of claim 23, wherein a central thickness CT1 of the first lens on the optical axis, a central thickness CT2 of the second lens on the optical axis and a central thickness CT3 of the third lens on the optical axis satisfy 0.8< CT1/(CT2+ CT3) < 1.3.
25. The iris lens as claimed in claim 20, having a total effective focal length f, wherein a distance TTL between an object side surface of the first lens element and the image plane on the optical axis and the total effective focal length f satisfy 0.7< TTL/f < 1.1.
26. The iris lens of claim 25 wherein the distance TTL between the object side surface of the first lens element and the imaging surface along the optical axis and the half ImgH of the diagonal length of the effective pixel area of the electronic photosensitive element on the imaging surface satisfy TTL/ImgH ≦ 2.65.
27. An iris lens as claimed in claim 25 or 26, wherein the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy-0.9 < f1/f2< -0.2.
28. An iris lens as claimed in claim 27, wherein an effective radius DT11 of an object side surface of the first lens and an effective radius DT22 of an image side surface of the second lens satisfy 1.2< DT11/DT22< 1.8.
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| PCT/CN2017/107846 WO2018214397A1 (en) | 2017-05-26 | 2017-10-26 | Iris lens |
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| CN109856900B (en) * | 2018-11-27 | 2021-05-14 | 玉晶光电(厦门)有限公司 | Optical lens group |
| US20220326480A1 (en) * | 2021-04-06 | 2022-10-13 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system |
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