CN211014809U - Optical imaging system - Google Patents
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- CN211014809U CN211014809U CN201921722166.9U CN201921722166U CN211014809U CN 211014809 U CN211014809 U CN 211014809U CN 201921722166 U CN201921722166 U CN 201921722166U CN 211014809 U CN211014809 U CN 211014809U
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Abstract
The application discloses an optical imaging system, which comprises in order from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having a positive optical power; a third lens having optical power; a fourth lens having a focal power, wherein the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having optical power. The Semi-FOV of half of the maximum field angle of the optical imaging system, the total effective focal length f of the optical imaging system, and the effective focal length f2 of the second lens satisfy the following conditional expression: Semi-FOV is more than or equal to 60 degrees; and 3.2 < f2/f < 4.8.
Description
Technical Field
The present application relates to the field of optical elements, and in particular, to an optical imaging system.
Background
With the rapid development of portable electronic products such as mobile phones, people have higher and higher requirements on the performance of optical imaging systems, such as pixels, imaging quality, resolution and the like. Meanwhile, with the increase of the diversity demand of users, the optical imaging system is required to have a larger field angle and a larger aperture, so that the optical imaging system can clearly image the scenery.
At present, in order to obtain better imaging quality, lenses of portable electronic products such as mobile phones and the like mostly adopt four-piece, five-piece and six-piece lens structures. However, with the continuous reduction in pixel size and the increasing demand for imaging performance of photosensitive elements, seven-and eight-lens structures have been designed and manufactured.
SUMMERY OF THE UTILITY MODEL
The present application provides an optical imaging system, in order from an object side to an image side along an optical axis, comprising: a first lens having a negative optical power; a second lens having a positive optical power; a third lens having optical power; a fourth lens having a focal power, wherein the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having optical power. Wherein, half of the Semi-FOV of the maximum field angle of the optical imaging system can satisfy: the Semi-FOV is more than or equal to 60 degrees.
In one embodiment, the total effective focal length f of the optical imaging system and the effective focal length f5 of the fifth lens may satisfy: -2.5 < f5/f < -1.0.
In one embodiment, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging system may satisfy: f2/f is more than 3.2 and less than 4.8.
In one embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens may satisfy: 1.0 < | f1/f3| < 3.2.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R8 of the image-side surface of the fourth lens may satisfy: 1.0 < R1/R8 < 2.0.
In one embodiment, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, and the radius of curvature R5 of the object-side surface of the third lens may satisfy: 1.0 < R5/(R3+ R4) < 2.1.
In one embodiment, the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R7 of the object-side surface of the fourth lens may satisfy: 1.0 < R7/R6 < 2.5.
In one embodiment, the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens may satisfy: 4.5 < (R13+ R14)/(R13-R14) < 30.5.
In one embodiment, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis may satisfy: 0.5 < CT3/CT4 < 4.5.
In one embodiment, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 0.5 < CT6/CT7 < 2.5.
In one embodiment, a separation distance T56 between the fifth lens and the sixth lens on the optical axis and a separation distance T67 between the sixth lens and the seventh lens on the optical axis may satisfy: 0.5 < T67/T56 < 4.6.
In one embodiment, the distance T23 between the second lens and the third lens on the optical axis and the central thickness CT2 of the second lens on the optical axis may satisfy: T23/CT2 is more than 1.0 and less than 1.5.
In one embodiment, the refractive index N2 of the second lens and the refractive index N5 of the fifth lens may both be greater than 1.60.
In one embodiment, both the abbe number V2 of the second lens and the abbe number V5 of the fifth lens may be less than 25.0.
This application adopts seven lens, through the focal power of rational distribution each lens, face type, each lens's central thickness and each lens between the epaxial interval etc for above-mentioned optical imaging system has at least one beneficial effect such as miniaturization, wide angle, high imaging quality.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application;
fig. 2A to 2C show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 1;
fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application;
fig. 4A to 4C show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 2;
fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application;
fig. 6A to 6C show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 3;
fig. 7 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application;
fig. 8A to 8C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 4;
fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application;
fig. 10A to 10C show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 5;
fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application;
fig. 12A to 12C show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 6;
fig. 13 is a schematic structural view showing an optical imaging system according to embodiment 7 of the present application;
fig. 14A to 14C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 7.
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.
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.
The features, principles, and other aspects of the present application are described in detail below.
An optical imaging system according to an exemplary embodiment of the present application may include seven lenses having optical powers, respectively, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the seventh lens may have a spacing distance therebetween.
In an exemplary embodiment, the first lens may have a negative power; the second lens may have a positive optical power; the third lens may have a positive optical power or a negative optical power; the fourth lens can have positive focal power or negative focal power, the object side surface of the fourth lens can be a concave surface, and the image side surface of the fourth lens can be a convex surface; the fifth lens may have a positive power or a negative power; the sixth lens may have a positive optical power or a negative optical power; the seventh lens may have a positive power or a negative power.
The optical power of the first lens is reasonably matched, so that the inclination angle of incident light rays is reduced, a larger-range field angle is obtained, and the optical imaging system has the advantage of a large field angle. The optical power of the second lens is reasonably matched, which is beneficial to correcting the off-axis aberration of the optical imaging system and improving the imaging quality. The tolerance sensitivity of the optical imaging system can be effectively reduced by reasonably controlling the surface type of the fourth lens.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: the Semi-FOV is greater than or equal to 60 degrees, wherein the Semi-FOV is half of the maximum field angle of the optical imaging system. More specifically, the Semi-FOV further satisfies: the Semi-FOV is more than or equal to 62 degrees. The Semi-FOV is more than or equal to 60 degrees, and the collection capability of the optical imaging system on the object information can be improved.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: -2.5 < f5/f < -1.0, wherein f is the total effective focal length of the optical imaging system and f5 is the effective focal length of the fifth lens. More specifically, f5 and f further satisfy: -2.4 < f5/f < -1.2. Satisfying-2.5 < f5/f < -1.0, the fifth lens can generate positive spherical aberration which is balanced with negative spherical aberration generated by other lenses of the optical imaging system, thereby the imaging quality of the optical imaging system on the axis is good.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 3.2 < f2/f < 4.8, wherein f2 is the effective focal length of the second lens and f is the total effective focal length of the optical imaging system. Satisfying 3.2 < f2/f < 4.8, the second lens can generate negative spherical aberration which is balanced with positive spherical aberration generated by other lenses of the optical imaging system, thereby the imaging quality of the optical imaging system on the axis is good.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 1.0 < | f1/f3| < 3.2, where f1 is the effective focal length of the first lens and f3 is the effective focal length of the third lens. More specifically, f1 and f3 may further satisfy: 1.0 < | f1/f3| < 2.0. Satisfying 1.0 < | f1/f3| < 3.2, the spherical aberration contribution amount of the first lens and the third lens can be controlled within a reasonable level, so that the on-axis field of view obtains good imaging quality.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 1.0 < R1/R8 < 2.0, wherein R1 is the radius of curvature of the object-side surface of the first lens and R8 is the radius of curvature of the image-side surface of the fourth lens. The optical imaging system meets the requirement that R1/R8 is more than 1.0 and less than 2.0, the coma contribution rate of the first lens and the coma contribution rate of the fourth lens can be controlled within a reasonable range, and further coma generated by the front lens can be well balanced, so that the optical imaging system obtains good imaging quality.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 1.0 < R5/(R3+ R4) < 2.1, where R3 is the radius of curvature of the object-side surface of the second lens, R4 is the radius of curvature of the image-side surface of the second lens, and R5 is the radius of curvature of the object-side surface of the third lens. The requirements of 1.0 < R5/(R3+ R4) < 2.1 are met, the CRA matching of the optical imaging system can be ensured, the field curvature of the optical imaging system can be corrected, and the imaging definition requirements of each field of view are met.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 1.0 < R7/R6 < 2.5, wherein R6 is the radius of curvature of the image-side surface of the third lens and R7 is the radius of curvature of the object-side surface of the fourth lens. More specifically, R7 and R6 may further satisfy: 1.0 < R7/R6 < 2.2. The total deflection angle of the marginal field of view on the image side surface of the third lens and the object side surface of the fourth lens can be controlled within a reasonable range, and the sensitivity of the optical imaging system can be effectively reduced.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 4.5 < (R13+ R14)/(R13-R14) < 30.5, wherein R13 is the radius of curvature of the object-side surface of the seventh lens, and R14 is the radius of curvature of the image-side surface of the seventh lens. Satisfying 4.5 < (R13+ R14)/(R13-R14) < 30.5 can make coma aberration of on-axis and off-axis fields of view smaller, thereby making the optical imaging system have good imaging quality.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 < CT3/CT4 < 4.5, wherein CT3 is the central thickness of the third lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis. More specifically, CT3 and CT4 further satisfy: 0.8 < CT3/CT4 < 4.5. The thickness sensitivity of the optical imaging system can be reduced and the field curvature of the optical imaging system can be corrected favorably when the requirement of 0.5 & lt CT3/CT4 & lt 4.5 is met.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 < CT6/CT7 < 2.5, wherein CT6 is the central thickness of the sixth lens on the optical axis, and CT7 is the central thickness of the seventh lens on the optical axis. More specifically, CT6 and CT7 further satisfy: 0.5 < CT6/CT7 < 2.3. The requirements of 0.5 & lt CT6/CT7 & lt 2.5 are met, the injection molding of the lens can be facilitated, the processability of the optical imaging system is improved, and the optical imaging system is ensured to have better imaging quality.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 < T67/T56 < 4.6, wherein T56 is the distance between the fifth lens and the sixth lens on the optical axis, and T67 is the distance between the sixth lens and the seventh lens on the optical axis. The requirement that the field curvature contribution quantity of each field is controlled within a reasonable range is satisfied, wherein the T67/T56 is more than 0.5 and less than 4.6.
In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 1.0 < T23/CT2 < 1.5, wherein T23 is the distance between the second lens and the third lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis. The requirement that T23/CT2 is more than 1.0 and less than 1.5 is met, the field curvature and distortion of the optical imaging system can be effectively ensured, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the refractive index N2 of the second lens and the refractive index N5 of the fifth lens may both be greater than 1.60. The high-refractive-index material is adopted, so that the off-axis coma aberration and astigmatism of the optical imaging system can be corrected, and the imaging quality of the outer field of view of the optical imaging system can be improved.
In an exemplary embodiment, both the abbe number V2 of the second lens and the abbe number V5 of the fifth lens may be less than 25.0. The high-refractive-index material is adopted, so that the off-axis coma aberration and astigmatism of the optical imaging system can be corrected, and the imaging quality of the outer field of view of the optical imaging system can be improved.
The optical imaging system according to the above-described embodiment of the present application may employ a plurality of lenses, such as the seven lenses described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the incident light can be effectively converged, the optical total length of the optical imaging system can be reduced, the processability of the optical imaging system can be improved, and the optical imaging system is more favorable for production and processing and can be suitable for portable electronic equipment. With the optical imaging system configured as described above, it is possible to have characteristics such as a wide angle, high imaging quality, high resolution, and the like.
In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the seventh lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, 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. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspheric mirror surface. Optionally, each of the first, second, third, fourth, fifth, sixth, and seventh lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the optical imaging system 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 seven lenses are exemplified in the embodiment, the optical imaging system is not limited to include seven lenses. The optical imaging system may also include other numbers of lenses, if desired.
Specific examples of the optical imaging system that can be applied to the above-described embodiments are further described below with reference to the drawings.
Example 1
An optical imaging system according to embodiment 1 of the present application is described below with reference to fig. 1 to 2C. Fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application.
As shown in fig. 1, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 1 shows a basic parameter table of the optical imaging system of example 1, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).
TABLE 1
In the present example, the total effective focal length f of the optical imaging system is 2.70mm, the total length TT L of the optical imaging system (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system) is 6.56mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging system is 3.86mm, the half Semi-FOV of the maximum angle of view of the optical imaging system is 62.8 °, and the aperture value Fno of the optical imaging system is 2.20.
In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the seventh lens E7 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex 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 a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S14 used in example 14、A6、A8、A10、A12、A14、A16、A18And A20。
TABLE 2
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 1. Fig. 2C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 1, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 2A to 2C, the optical imaging system according to embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging system according to embodiment 2 of the present application is described below with reference to fig. 3 to 4C. 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 optical imaging system according to embodiment 2 of the present application.
As shown in fig. 3, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 2.69mm, the total length TT L of the optical imaging system is 6.56mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the optical imaging system is 3.86mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 62.9 °, and the aperture value Fno of the optical imaging system is 2.20.
Table 3 shows a basic parameter table of the optical imaging system of example 2, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 3
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 6.4394E-01 | -7.0440E-02 | 2.2245E-02 | -3.7291E-03 | 2.4656E-03 | -8.0559E-04 | 2.2514E-04 | -9.3859E-05 | 2.1073E-05 |
| S2 | 5.2276E-01 | -2.0994E-02 | -6.4908E-03 | -5.7655E-03 | -4.8164E-04 | -1.9526E-03 | -1.3169E-03 | -5.9543E-04 | -1.2345E-04 |
| S3 | -4.1641E-02 | -2.9021E-02 | -2.2023E-02 | 9.3986E-03 | 1.0952E-02 | 5.3232E-03 | 1.3860E-03 | 1.1222E-04 | -4.4716E-05 |
| S4 | 4.8015E-02 | 5.3261E-03 | -2.4663E-03 | -8.1914E-04 | -1.7294E-04 | 1.4003E-05 | 3.1601E-05 | 1.3295E-05 | 7.5340E-06 |
| S5 | -9.1415E-03 | -5.1273E-03 | -8.4994E-04 | 3.0247E-04 | 4.1489E-04 | 2.7973E-04 | 1.3542E-04 | 4.6225E-05 | 8.2870E-06 |
| S6 | -6.8837E-02 | -1.8901E-02 | -4.3846E-03 | 1.3213E-03 | 2.1894E-03 | 1.4948E-03 | 6.7585E-04 | 1.9448E-04 | 3.1176E-05 |
| S7 | -3.6409E-07 | 6.7940E-06 | 4.3671E-04 | 6.7158E-05 | -3.1441E-04 | -1.8704E-04 | -4.2787E-05 | 1.4952E-05 | 1.0847E-06 |
| S8 | 3.3552E-07 | -2.1925E-04 | 8.2319E-05 | 6.4949E-04 | 1.1911E-04 | -5.6534E-05 | -5.1656E-05 | -2.2673E-05 | -8.4287E-07 |
| S9 | -3.1705E-01 | 1.4677E-02 | -2.1763E-04 | -6.2246E-04 | -1.2060E-04 | -1.6287E-04 | 1.9599E-06 | -1.2474E-05 | 1.8019E-07 |
| S10 | -2.8415E-01 | 6.2269E-02 | -2.8547E-04 | -3.0944E-03 | 4.8626E-04 | 3.5015E-05 | 1.2227E-04 | -5.2318E-05 | 1.6990E-05 |
| S11 | -7.1949E-02 | 5.2523E-02 | -8.3970E-03 | -2.1176E-03 | 5.8583E-04 | 2.9782E-04 | -2.2739E-04 | 4.0817E-05 | 3.1664E-06 |
| S12 | -8.2932E-02 | 1.2057E-01 | -2.4765E-02 | 1.8534E-03 | -1.2202E-03 | 1.0926E-03 | -5.6481E-04 | 5.5041E-05 | 1.9432E-05 |
| S13 | -2.2488E+00 | 5.3096E-01 | -6.6390E-02 | 3.2393E-02 | -2.7794E-02 | 7.3033E-03 | 6.5076E-04 | 4.7877E-05 | -2.6532E-04 |
| S14 | -2.4627E+00 | 3.6563E-01 | -1.8916E-01 | 8.0187E-02 | -1.8750E-02 | 1.8270E-02 | -3.6932E-03 | 1.9345E-03 | -1.1231E-03 |
TABLE 4
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 2. Fig. 4C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 2, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 4A to 4C, the optical imaging system according to embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 5 to 6C. Fig. 5 shows a schematic structural diagram of an optical imaging system according to embodiment 3 of the present application.
As shown in fig. 5, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 2.70mm, the total length TT L of the optical imaging system is 6.63mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the optical imaging system is 3.86mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 63.1 °, and the aperture value Fno of the optical imaging system is 2.18.
Table 5 shows a basic parameter table of the optical imaging system of example 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 5
TABLE 6
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 3, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 3. Fig. 6C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 3, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 6A to 6C, the optical imaging system according to embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging system according to embodiment 4 of the present application is described below with reference to fig. 7 to 8C. Fig. 7 shows a schematic structural diagram of an optical imaging system according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 2.73mm, the total length TT L of the optical imaging system is 6.56mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the optical imaging system is 3.86mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 62.6 °, and the aperture value Fno of the optical imaging system is 2.16.
Table 7 shows a basic parameter table of the optical imaging system of example 4 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 7
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 6.6790E-01 | -6.5823E-02 | 2.0532E-02 | -3.3350E-03 | 2.8471E-03 | -5.2160E-04 | 2.1517E-04 | -7.9946E-05 | 2.5208E-05 |
| S2 | 4.8011E-01 | -3.4249E-03 | -1.8734E-02 | -8.2486E-03 | -8.8750E-04 | 6.5067E-04 | -2.5485E-04 | -2.6943E-04 | -1.7762E-04 |
| S3 | -1.1840E-01 | -6.6476E-03 | -2.3918E-02 | 8.8472E-03 | 1.0481E-02 | 6.5369E-03 | 2.0219E-03 | 3.4637E-04 | -4.2678E-05 |
| S4 | 1.8915E-02 | 4.1650E-03 | -3.9031E-03 | -1.1856E-03 | -2.4704E-04 | 6.0975E-05 | 7.7390E-05 | 3.2591E-05 | 1.3894E-05 |
| S5 | -1.2601E-02 | -4.2548E-03 | -1.1127E-03 | -1.9313E-04 | 1.9284E-05 | 4.0410E-05 | 2.3390E-05 | 9.9055E-06 | 1.9640E-06 |
| S6 | -8.3655E-02 | -1.6775E-02 | -3.6828E-03 | 1.0164E-03 | 1.7623E-03 | 1.2291E-03 | 5.8851E-04 | 1.9093E-04 | 3.7298E-05 |
| S7 | -9.1888E-05 | 8.4641E-05 | 1.3605E-04 | 1.2641E-04 | 2.2943E-05 | 1.6942E-05 | 5.4506E-08 | 8.1922E-06 | -1.1490E-06 |
| S8 | -6.4266E-06 | 5.4825E-05 | -9.6461E-06 | 6.2363E-05 | 2.2938E-05 | 3.5638E-06 | -3.8933E-06 | 1.8570E-06 | -5.3921E-08 |
| S9 | -3.0462E-01 | 1.1601E-02 | 1.7368E-03 | -1.0863E-03 | -9.5020E-05 | -1.1603E-04 | 1.8164E-05 | 4.5549E-06 | -1.7727E-06 |
| S10 | -2.8849E-01 | 5.8330E-02 | 3.1636E-03 | -4.9888E-03 | 6.4413E-04 | -1.4601E-04 | 2.2742E-04 | -8.8564E-05 | 2.1538E-05 |
| S11 | -3.8864E-02 | 5.1723E-02 | -9.4465E-03 | -1.5006E-03 | 5.7381E-04 | 1.7242E-04 | -1.5680E-04 | 1.0078E-06 | 1.1473E-05 |
| S12 | -1.4458E-01 | 1.3157E-01 | -2.9797E-02 | 3.8070E-03 | -1.4474E-03 | 1.4132E-03 | -5.2888E-04 | 3.8921E-05 | 7.1362E-06 |
| S13 | -1.9548E+00 | 5.4196E-01 | -8.5540E-02 | 4.9807E-03 | -2.3967E-02 | 1.2905E-02 | -2.2318E-03 | -1.8250E-03 | -3.2249E-05 |
| S14 | -2.6294E+00 | 3.9431E-01 | -2.0337E-01 | 9.6136E-02 | -2.4897E-02 | 1.9815E-02 | -8.0416E-03 | 9.8593E-04 | -2.2299E-03 |
TABLE 8
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 4, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 4. Fig. 8C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 4, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 8A to 8C, the optical imaging system according to embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging system according to embodiment 5 of the present application is described below with reference to fig. 9 to 10C. Fig. 9 shows a schematic structural diagram of an optical imaging system according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 2.70mm, the total length TT L of the optical imaging system is 6.64mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the optical imaging system is 3.86mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 62.8 °, and the aperture value Fno of the optical imaging system is 2.19.
Table 9 shows a basic parameter table of the optical imaging system of example 5 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 9
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 6.5691E-01 | -8.2876E-02 | 2.3153E-02 | -4.4737E-03 | 3.0071E-03 | -8.4770E-04 | 2.4773E-04 | -1.0080E-04 | 3.8767E-05 |
| S2 | 5.2537E-01 | -4.1153E-02 | -3.2741E-04 | -4.9540E-03 | 4.3390E-04 | -2.6288E-03 | -1.8988E-03 | -9.1771E-04 | -1.7931E-04 |
| S3 | -3.0605E-02 | -4.3209E-02 | -2.7384E-02 | 6.4292E-03 | 1.0513E-02 | 4.8321E-03 | 1.2436E-03 | 7.5474E-05 | -2.8601E-05 |
| S4 | 4.8983E-02 | 7.8382E-03 | -1.7280E-03 | -8.3678E-04 | -2.7111E-04 | -5.8429E-05 | 8.9690E-06 | 7.7179E-06 | 7.1902E-06 |
| S5 | -5.4644E-03 | -2.1721E-03 | 2.9909E-04 | 8.3986E-04 | 6.4173E-04 | 3.5691E-04 | 1.4623E-04 | 4.3758E-05 | 4.1742E-06 |
| S6 | -7.7010E-02 | -1.3552E-02 | -1.6648E-03 | 2.0829E-03 | 2.0779E-03 | 1.2943E-03 | 5.7726E-04 | 1.6888E-04 | 2.9785E-05 |
| S7 | 3.0289E-12 | 2.4714E-04 | 3.4815E-04 | -6.5206E-05 | -2.9998E-04 | -1.5266E-04 | 2.0355E-05 | 2.6796E-05 | 8.8499E-06 |
| S8 | -8.2814E-12 | -4.1029E-04 | 5.0414E-04 | 4.6278E-04 | 2.0156E-05 | -9.6973E-05 | -5.6285E-05 | -2.3698E-05 | 8.5467E-07 |
| S9 | -2.9848E-01 | 1.1482E-02 | -5.7507E-03 | -5.8438E-04 | -7.1283E-04 | -1.0470E-04 | -7.4475E-05 | -1.9956E-05 | -1.3625E-05 |
| S10 | -2.5223E-01 | 5.5453E-02 | -6.9537E-03 | -1.0408E-03 | 2.2459E-04 | 2.3912E-04 | -4.6423E-05 | -2.0297E-05 | 1.2524E-05 |
| S11 | -9.7326E-02 | 4.5528E-02 | -1.0275E-02 | 4.5565E-04 | 8.4401E-05 | 2.0915E-04 | -1.5667E-04 | 3.9877E-05 | -3.1879E-06 |
| S12 | -2.7987E-02 | 9.1873E-02 | -1.8654E-02 | 3.7128E-03 | -1.4051E-03 | 6.1913E-04 | -4.8492E-04 | 1.3024E-04 | -5.0190E-06 |
| S13 | -2.2288E+00 | 5.2943E-01 | -1.0711E-01 | 5.2615E-02 | -2.4439E-02 | 4.8181E-03 | -1.2236E-03 | 8.6758E-04 | -2.1522E-04 |
| S14 | -2.3011E+00 | 3.4068E-01 | -1.7492E-01 | 8.1929E-02 | -1.8265E-02 | 1.7304E-02 | -4.8341E-03 | 1.8765E-03 | -1.3973E-03 |
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 5, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 5. Fig. 10C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 5, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 10A to 10C, the optical imaging system according to embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging system according to embodiment 6 of the present application is described below with reference to fig. 11 to 12C. Fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application.
As shown in fig. 11, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 2.72mm, the total length TT L of the optical imaging system is 6.55mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the optical imaging system is 3.86mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 62.6 °, and the aperture value Fno of the optical imaging system is 2.15.
Table 11 shows a basic parameter table of the optical imaging system of example 6 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 11
TABLE 12
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 6, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 6. Fig. 12C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 6, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 12A to 12C, the optical imaging system according to embodiment 6 can achieve good imaging quality.
Example 7
An optical imaging system according to embodiment 7 of the present application is described below with reference to fig. 13 to 14C. Fig. 13 shows a schematic configuration diagram of an optical imaging system according to embodiment 7 of the present application.
As shown in fig. 13, the optical imaging system, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 2.76mm, the total length TT L of the optical imaging system is 6.62mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the optical imaging system is 3.86mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 62.2 °, and the aperture value Fno of the optical imaging system is 2.17.
Table 13 shows a basic parameter table of the optical imaging system of example 7 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Watch 13
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 6.4874E-01 | -5.5785E-02 | 2.1740E-02 | -2.4745E-03 | 2.2356E-03 | -5.9350E-04 | 2.4755E-04 | -3.1832E-05 | 2.5509E-05 |
| S2 | 4.8243E-01 | -7.3097E-03 | -1.3459E-02 | -8.7923E-03 | -5.7981E-03 | -3.9560E-03 | -2.5918E-03 | -9.2400E-04 | -2.7565E-04 |
| S3 | -6.2247E-02 | -2.0594E-02 | -3.1882E-02 | 5.8675E-03 | 6.5596E-03 | 3.2923E-03 | 1.5108E-04 | -2.3843E-04 | -1.5012E-04 |
| S4 | 4.0795E-02 | 7.6242E-03 | -1.8539E-03 | -4.8846E-04 | -1.3388E-04 | 2.3044E-05 | 2.6834E-05 | 1.1129E-05 | 7.2857E-06 |
| S5 | -1.1829E-02 | -4.7192E-03 | -9.2923E-04 | 3.3749E-05 | 1.9335E-04 | 1.6214E-04 | 9.8204E-05 | 4.2859E-05 | 1.1862E-05 |
| S6 | -4.3553E-02 | -6.6771E-03 | 9.2910E-04 | 2.3457E-03 | 1.9905E-03 | 1.2057E-03 | 5.8103E-04 | 2.0190E-04 | 4.7644E-05 |
| S7 | -1.3703E-04 | 8.9508E-05 | 1.2995E-04 | 1.6508E-04 | 2.7397E-05 | 1.4618E-05 | -3.3539E-06 | 2.9723E-06 | 2.3123E-06 |
| S8 | -7.1736E-05 | -3.7980E-06 | 8.2498E-06 | 5.8189E-05 | 2.3091E-05 | 5.8450E-06 | 2.7037E-08 | -7.9009E-07 | -4.4053E-07 |
| S9 | -3.0021E-01 | 2.2135E-02 | -2.0968E-04 | -2.9269E-04 | -6.2204E-05 | -1.5315E-05 | -6.9636E-06 | 9.6007E-06 | -4.0211E-06 |
| S10 | -2.1466E-01 | 5.4857E-02 | 5.0525E-03 | -4.8229E-03 | 1.7660E-03 | -1.4025E-04 | 1.2374E-04 | -8.7106E-05 | 3.1449E-06 |
| S11 | -3.1260E-02 | 5.6190E-02 | -7.3682E-03 | -3.4350E-03 | 9.1029E-04 | 4.3612E-04 | -3.0962E-04 | 7.2051E-05 | -5.7574E-06 |
| S12 | 1.7438E-02 | 9.7741E-02 | -1.2951E-02 | -3.2154E-03 | -5.2678E-04 | 1.0003E-03 | -4.1294E-04 | 8.2813E-05 | -5.3686E-06 |
| S13 | -1.7302E+00 | 5.1142E-01 | 1.7377E-02 | 6.9482E-03 | 1.9126E-02 | 3.0169E-02 | 8.8162E-03 | 5.4754E-04 | 1.4400E-04 |
| S14 | -2.0122E+00 | 1.7565E-01 | -9.1064E-02 | 5.8919E-02 | 4.7864E-03 | 1.3909E-02 | -1.5223E-03 | 3.7719E-04 | -1.1674E-03 |
TABLE 14
Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 7, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 7. Fig. 14C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 7, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 14A to 14C, the optical imaging system according to embodiment 7 can achieve good imaging quality.
In summary, examples 1 to 7 each satisfy the relationship shown in table 15.
| Conditions/examples | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| f2/f | 4.44 | 4.23 | 3.97 | 3.39 | 4.72 | 3.28 | 3.65 |
| |f1/f3| | 1.48 | 1.45 | 1.33 | 1.14 | 1.39 | 1.82 | 1.54 |
| f5/f | -1.66 | -1.72 | -1.75 | -2.20 | -1.39 | -1.57 | -1.87 |
| R1/R8 | 1.86 | 1.70 | 1.77 | 1.61 | 1.88 | 1.22 | 1.46 |
| R5/(R3+R4) | 1.18 | 1.45 | 1.68 | 2.03 | 1.26 | 1.04 | 2.03 |
| R7/R6 | 1.19 | 1.36 | 1.45 | 2.11 | 1.09 | 1.20 | 1.98 |
| (R13+R14)/(R13-R14) | 6.18 | 10.67 | 6.73 | 30.41 | 4.85 | 7.07 | 4.81 |
| CT3/CT4 | 1.37 | 1.34 | 1.21 | 0.92 | 1.42 | 4.34 | 1.32 |
| CT6/CT7 | 1.62 | 1.29 | 1.58 | 0.85 | 2.19 | 2.12 | 1.13 |
| T67/T56 | 2.62 | 2.44 | 2.16 | 1.13 | 4.34 | 4.51 | 0.74 |
| T23/CT2 | 1.34 | 1.37 | 1.38 | 1.42 | 1.29 | 1.06 | 1.43 |
Watch 15
The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system 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 (26)
1. The optical imaging system, in order from an object side to an image side along an optical axis, comprises:
a first lens having a negative optical power;
a second lens having a positive optical power;
a third lens having optical power;
a fourth lens having a focal power, wherein the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface;
a fifth lens having optical power;
a sixth lens having optical power;
a seventh lens having optical power;
wherein a Semi-FOV of a maximum field angle of the optical imaging system, a total effective focal length f of the optical imaging system, and an effective focal length f2 of the second lens satisfy the following conditional expressions:
Semi-FOV is more than or equal to 60 degrees; and
3.2＜f2/f＜4.8。
2. the optical imaging system of claim 1, wherein the total effective focal length f of the optical imaging system and the effective focal length f5 of the fifth lens satisfy: -2.5 < f5/f < -1.0.
3. The optical imaging system of claim 1, wherein the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 1.0 < | f1/f3| < 3.2.
4. The optical imaging system of claim 1, wherein the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: 1.0 < R1/R8 < 2.0.
5. The optical imaging system of claim 1, wherein the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, and the radius of curvature R5 of the object-side surface of the third lens satisfy: 1.0 < R5/(R3+ R4) < 2.1.
6. The optical imaging system of claim 1, wherein the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy: 1.0 < R7/R6 < 2.5.
7. The optical imaging system of claim 1, wherein the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: 4.5 < (R13+ R14)/(R13-R14) < 30.5.
8. The optical imaging system of claim 1, wherein a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.5 < CT3/CT4 < 4.5.
9. The optical imaging system of claim 1, wherein a central thickness CT6 of the sixth lens on the optical axis and a central thickness CT7 of the seventh lens on the optical axis satisfy: 0.5 < CT6/CT7 < 2.5.
10. The optical imaging system of claim 1, wherein a separation distance T56 between the fifth lens and the sixth lens on the optical axis and a separation distance T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.5 < T67/T56 < 4.6.
11. The optical imaging system of claim 1, wherein the second lens and the third lens are separated by a distance T23 on the optical axis and a center thickness CT2 of the second lens on the optical axis, such that: T23/CT2 is more than 1.0 and less than 1.5.
12. The optical imaging system of any of claims 1 to 11, wherein a refractive index N2 of the second lens and a refractive index N5 of the fifth lens are both greater than 1.60.
13. The optical imaging system of any of claims 1 to 11, wherein the abbe number V2 of the second lens and the abbe number V5 of the fifth lens are both less than 25.0.
14. The optical imaging system, in order from an object side to an image side along an optical axis, comprises:
a first lens having a negative optical power;
a second lens having a positive optical power;
a third lens having optical power;
a fourth lens having a focal power, wherein the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface;
a fifth lens having optical power;
a sixth lens having optical power;
a seventh lens having optical power;
wherein a Semi-FOV of a maximum field angle of the optical imaging system, an effective focal length f1 of the first lens, and an effective focal length f3 of the third lens satisfy the following conditional expressions:
Semi-FOV is more than or equal to 60 degrees; and
1.0＜|f1/f3|＜3.2。
15. the optical imaging system of claim 14, wherein the total effective focal length f of the optical imaging system and the effective focal length f5 of the fifth lens satisfy: -2.5 < f5/f < -1.0.
16. The optical imaging system of claim 15, wherein the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging system satisfy: f2/f is more than 3.2 and less than 4.8.
17. The optical imaging system of claim 14, wherein a radius of curvature R1 of an object-side surface of the first lens and a radius of curvature R8 of an image-side surface of the fourth lens satisfy: 1.0 < R1/R8 < 2.0.
18. The optical imaging system of claim 14, wherein the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, and the radius of curvature R5 of the object-side surface of the third lens satisfy: 1.0 < R5/(R3+ R4) < 2.1.
19. The optical imaging system of claim 14, wherein the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy: 1.0 < R7/R6 < 2.5.
20. The optical imaging system of claim 14, wherein the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: 4.5 < (R13+ R14)/(R13-R14) < 30.5.
21. The optical imaging system of claim 14, wherein a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.5 < CT3/CT4 < 4.5.
22. The optical imaging system of claim 14, wherein a central thickness CT6 of the sixth lens on the optical axis and a central thickness CT7 of the seventh lens on the optical axis satisfy: 0.5 < CT6/CT7 < 2.5.
23. The optical imaging system of claim 14, wherein a separation distance T56 between the fifth lens and the sixth lens on the optical axis and a separation distance T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.5 < T67/T56 < 4.6.
24. The optical imaging system of claim 14, wherein the second lens and the third lens are separated by a distance T23 on the optical axis and a center thickness CT2 of the second lens on the optical axis, such that: T23/CT2 is more than 1.0 and less than 1.5.
25. The optical imaging system of any of claims 14 to 24, wherein a refractive index N2 of the second lens and a refractive index N5 of the fifth lens are both greater than 1.60.
26. The optical imaging system of claim 25, wherein the abbe number V2 of the second lens and the abbe number V5 of the fifth lens are both less than 25.0.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554484A (en) * | 2019-10-15 | 2019-12-10 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN112147765A (en) * | 2020-09-28 | 2020-12-29 | 维沃移动通信有限公司 | Optical lens, optical module and electronic equipment |
| TWI748603B (en) * | 2020-08-14 | 2021-12-01 | 大陸商玉晶光電（廈門）有限公司 | Optical imaging lens |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554484A (en) * | 2019-10-15 | 2019-12-10 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN110554484B (en) * | 2019-10-15 | 2024-05-03 | 浙江舜宇光学有限公司 | Optical imaging system |
| TWI748603B (en) * | 2020-08-14 | 2021-12-01 | 大陸商玉晶光電（廈門）有限公司 | Optical imaging lens |
| CN112147765A (en) * | 2020-09-28 | 2020-12-29 | 维沃移动通信有限公司 | Optical lens, optical module and electronic equipment |
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