CN214751057U - Optical imaging system - Google Patents
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- CN214751057U CN214751057U CN202120750952.0U CN202120750952U CN214751057U CN 214751057 U CN214751057 U CN 214751057U CN 202120750952 U CN202120750952 U CN 202120750952U CN 214751057 U CN214751057 U CN 214751057U
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Abstract
The utility model discloses an optical imaging system includes according to the preface by thing side to picture side along the optical axis: a diaphragm; a first lens having an optical power; a second lens having a negative optical power; a third lens having optical power; a fourth lens having a negative optical power; a fifth lens having optical power; the image side surface of the sixth lens is a convex surface; and a seventh lens having optical power; wherein, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD is less than 1.4; the effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical imaging system satisfy: 1.0 < (f1+ R1)/f < 1.6; half of the Semi-FOV of the maximum field angle of the optical imaging system satisfies: 10.0 DEG < Semi-FOV < 30.0 deg. The utility model provides an optical imaging system has large aperture, long focal length, possess good imaging quality, is applicable to the shooting of clear portrait photo.
Description
Technical Field
The utility model belongs to the optical imaging field especially relates to an optical imaging system including seven lens.
Background
With the rapid development of smart phones, the demand for mobile phone lenses with good imaging performance is increasing, especially the demand for people to take clear portrait photos. In order to enable users to have better photographing experience, the mobile phone lens needs to have the characteristics of highlighting the main body and blurring the background, so that an optical imaging lens with large aperture and long focal length is needed.
Therefore, there is a need for a seven-lens telephoto lens system using an aspherical surface, which has good image quality and is suitable for taking clear portrait photos.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an optical imaging system that seven lens are constituteed has large aperture, long focal length, possess good imaging quality, is applicable to the shooting of clear portrait photo.
An aspect of the present invention provides an optical imaging system, which includes, along an optical axis, from an object side to an image side according to a predetermined order: a diaphragm; a first lens having an optical power; a second lens having a negative optical power; a third lens having optical power; a fourth lens having a negative optical power; a fifth lens having optical power; the image side surface of the sixth lens is a convex surface; and a seventh lens having optical power.
Wherein, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.4.
According to an embodiment of the present invention, the effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the effective focal length f of the optical imaging system satisfy: 1.0 < (f1+ R1)/f < 1.6.
According to an embodiment of the present invention, the effective focal length f2 of the second lens and the curvature radius R3 of the object side of the second lens satisfy: -6.5 < f2/R3< -2.0.
According to the utility model discloses an embodiment, the effective focal length f of optical imaging system satisfies with the radius of curvature R4 of second lens image side: f/R4 is more than 2.5 and less than or equal to 3.5.
According to an embodiment of the present invention, the effective focal length f6 of the sixth lens element and the curvature radius R12 of the image side surface of the sixth lens element satisfy: -2.0 < f6/R12< 0.
According to an embodiment of the present invention, the effective focal length f7 of the seventh lens element and the curvature radius R14 of the image side surface of the seventh lens element satisfy: -9.5 < f7/R14< -2.5.
According to an embodiment of the present invention, 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: 3.5 < CT1/CT2< 5.0.
According to an embodiment of the present invention, the on-axis center thickness CT3 of the third lens and the on-axis center thickness CT5 of the fifth lens satisfy: 2.0 < CT3/CT5< 3.5.
According to an embodiment of the present invention, the air space T45 on the optical axis between the fourth lens and the fifth lens and the air space T34 on the optical axis between the third lens and the fourth lens satisfy: 17.0mm-2＜1/(T45×T34)＜27.0mm-2。
According to an embodiment of the present invention, half of the Semi-FOV of the maximum field angle of the optical imaging system satisfies: 10.0 DEG < Semi-FOV < 30.0 deg.
According to the utility model discloses an embodiment, first lens object side is to the epaxial distance TTL of imaging surface and imaging surface on the regional diagonal length of effective pixel half ImgH satisfy: TTL/ImgH is more than 2.5 and less than 3.0.
Another aspect of the present invention provides an optical imaging system, which includes, along an optical axis, from an object side to an image side according to a predetermined order: a diaphragm; a first lens having an optical power; a second lens having a negative optical power; a third lens having optical power; a fourth lens having a negative optical power; a fifth lens having optical power; the image side surface of the sixth lens is a convex surface; and a seventh lens having optical power.
Wherein, each lens is independent, and there is air space on the optical axis between each lens; the effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical imaging system satisfy: 1.0 < (f1+ R1)/f < 1.6.
The utility model has the advantages that:
the utility model provides an optical imaging system includes the multi-disc lens, like first lens to seventh lens. The utility model discloses an optical imaging system has large aperture, long focal length, possess good imaging quality, is applicable to the shooting of clear portrait photo.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic view of a lens assembly structure of an embodiment 1 of an optical imaging system according to the present invention;
fig. 2a to fig. 2d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, according to embodiment 1 of the optical imaging system of the present invention;
fig. 3 is a schematic view of a lens assembly structure of an embodiment 2 of an optical imaging system according to the present invention;
fig. 4a to 4d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, according to embodiment 2 of the optical imaging system of the present invention;
fig. 5 is a schematic view of a lens assembly structure according to embodiment 3 of the optical imaging system of the present invention;
fig. 6a to 6d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, according to embodiment 3 of the optical imaging system of the present invention;
fig. 7 is a schematic view of a lens assembly structure according to embodiment 4 of the optical imaging system of the present invention;
fig. 8a to 8d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, according to embodiment 4 of the optical imaging system of the present invention;
fig. 9 is a schematic view of a lens assembly structure according to embodiment 5 of the present invention;
fig. 10a to 10d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, according to embodiment 5 of the optical imaging lens of the present invention;
fig. 11 is a schematic view of a lens assembly according to embodiment 6 of the present invention;
fig. 12a to 12d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve according to embodiment 6 of the present invention, respectively.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present invention.
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.
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.
In the description of the present invention, the paraxial region means 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.
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, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. Features, principles and other aspects of the present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.
Exemplary embodiments
The optical imaging system of the exemplary embodiment of the present invention includes seven lenses, and includes in order from the object side to the image side along the optical axis: the lens comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein the lenses are independent from each other, and an air space is formed between the lenses on an optical axis.
In the present exemplary embodiment, the first lens may have a positive power or a negative power; the second lens has negative focal power; the third lens may have a positive optical power or a negative optical power; the fourth lens has negative focal power; the fifth lens may have a positive power or a negative power; the sixth lens has positive focal power, and the image side surface of the sixth lens is a convex surface; the seventh lens may have a positive power or a negative power.
In the present exemplary embodiment, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy the conditional expression: f/EPD < 1.4. The system has smaller aberration by reasonably distributing the focal power of the lens; by restricting the ratio of the focal length to the diameter of the entrance pupil, the luminous flux of the system can be increased, the imaging effect under dark environment can be enhanced, and meanwhile, the aberration of the marginal field of view can be reduced. More specifically, f and EPD satisfy: 1.2< f/EPD <1.35, e.g., 1.22 ≦ f/EPD ≦ 1.31.
In the present exemplary embodiment, the effective focal length f1 of the first lens, the radius of curvature R1 of the object-side surface of the first lens, and the effective focal length f of the optical imaging system satisfy the conditional expression: 1.0 < (f1+ R1)/f < 1.6. Through the effective focal length of restraint first lens, optical imaging system's effective focal length, the radius of curvature of first lens object side can promote the ability of assembling to light, also is favorable to reducing optical imaging lens's aberration. More specifically, f1, R1 and f satisfy: 1.2< (f1+ R1)/f <1.55, e.g., 1.21 ≦ (f1+ R1)/f ≦ 1.53.
In the present exemplary embodiment, the effective focal length f2 of the second lens and the radius of curvature R3 of the object-side surface of the second lens satisfy the conditional expression: -6.5 < f2/R3< -2.0. The deflection angle of the light rays on the second lens can be controlled by restricting the effective focal length of the second lens and the curvature radius of the object side surface of the second lens, and the sensitivity of the system is favorably reduced. More specifically, f2 and R3 satisfy: 6.4< f2/R3< -2.1, for example, -6.33. ltoreq. f 2/R3. ltoreq. 2.13.
In the present exemplary embodiment, the effective focal length f of the optical imaging system and the radius of curvature R4 of the image-side surface of the second lens satisfy the conditional expression: f/R4 is more than 2.5 and less than or equal to 3.5. By restricting the ratio of the effective focal length of the optical imaging system to the curvature radius of the image side surface of the second lens, the aberration can be corrected, and the lens has good imaging quality. More specifically, f and R4 satisfy: 2.7< f/R4 ≦ 3.45, e.g., 2.75 ≦ f/R4 ≦ 3.44.
In the present exemplary embodiment, the effective focal length f6 of the sixth lens and the curvature radius R12 of the image-side surface of the sixth lens satisfy the conditional expression: -2.0 < f6/R12< 0. By restricting the effective focal length of the sixth lens and the curvature radius of the image side surface of the sixth lens, the deflection angle of light rays at the sixth lens can be effectively controlled, and the good processing characteristic of a system is realized. More specifically, f6 and R12 satisfy: -1.9< f6/R12< -0.2, for example, -1.89. ltoreq. f 6/R12. ltoreq.0.25.
In the present exemplary embodiment, the effective focal length f7 of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens satisfy the conditional expression: -9.5 < f7/R14< -2.5. By restricting the effective focal length of the seventh lens and the curvature radius of the image side surface of the seventh lens, the light angle of the marginal field of view can be in a reasonable range, and the sensitivity of the system can be effectively reduced. More specifically, f7 and R14 satisfy: 9.2< f7/R14< -2.9, for example, -9.11. ltoreq. f 7/R14. ltoreq. 2.94.
In the present exemplary embodiment, 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 the conditional expression: 3.5 < CT1/CT2< 5.0. The ratio of the central thicknesses of the first lens and the second lens on the optical axis is reasonably controlled, so that the degree of freedom of lens surface change is higher, and the capability of the optical imaging lens for correcting astigmatism and curvature of field is improved. More specifically, CT1 and CT2 satisfy: 3.7< CT1/CT2<4.8, e.g., 3.78 ≦ CT1/CT2 ≦ 4.72.
In the present exemplary embodiment, the central thickness CT3 of the third lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy the conditional expression: 2.0 < CT3/CT5< 3.5. The ratio of the central thicknesses of the third lens and the fifth lens on the optical axis is reasonably controlled, the system size is effectively reduced, and the overlarge size of the optical imaging lens group is avoided. More specifically, CT3 and CT5 satisfy: 2.2< CT3/CT5<3.1, e.g., 2.29. ltoreq. CT3/CT 5. ltoreq.3.03.
In the present exemplary embodiment, the air interval T45 of the fourth lens and the fifth lens on the optical axis and the air interval T34 of the third lens and the fourth lens on the optical axis satisfy the conditional expression: 17.0mm-2＜1/(T45×T34)＜27.0mm-2. The ratio of the air space of the third lens and the fourth lens on the optical axis to the air space of the fourth lens and the fifth lens on the optical axis is reasonably controlled, so that the distortion of the system is favorably controlled, and the system has good distortion performance. More specifically, T45 and T34 satisfy: 17.1mm-2<1/(T45×T34)<26.95mm-2E.g. 17.20mm-2≤1/(T45×T34)≤26.94mm-2。
In the present exemplary embodiment, the Semi-FOV, which is half the maximum field angle of the optical imaging system, satisfies the conditional expression: 10.0 DEG < Semi-FOV < 30.0 deg. The maximum half field angle of the optical imaging lens is reasonably controlled, so that the optical imaging lens meets the long-focus characteristic and has better capability of balancing aberration, the deflection angle of the chief ray can be reasonably controlled, and the matching degree with a chip is improved. More specifically, the Semi-FOV satisfies: 19 < Semi-FOV <22, e.g., 19.8 < Semi-FOV < 21.3.
In the present exemplary embodiment, the conditional expression that the on-axis distance TTL from the object-side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy is: TTL/ImgH is more than 2.5 and less than 3.0. The ratio of the total length of the system to the image height is reasonably restricted, and the miniaturization of the optical imaging lens is facilitated. More specifically, TTL and ImgH satisfy: 2.8< TTL/ImgH <3.0, e.g., 2.83 ≦ TTL/ImgH ≦ 2.99.
In the present exemplary embodiment, the above-described optical imaging system may further include a diaphragm. The stop may be disposed at an appropriate position as needed, for example, the stop may be disposed between the object side and the first lens. Optionally, the optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface.
The optical imaging system according to the above embodiment of the present invention may employ a plurality of lenses, for example, the above seven lenses. The optical imaging system has a large imaging image surface by reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, has the characteristics of wide imaging range and high imaging quality, and ensures the ultrathin property of the mobile phone.
In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspheric mirror surface. The aspheric lens is characterized in that: the aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and astigmatic aberration, unlike a spherical lens having a constant curvature from the lens center to the lens periphery, in which the curvature is continuously varied from the lens center to the lens periphery. 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 lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens has an object-side surface and an image-side surface which 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, and the optical imaging system may include other numbers of lenses if necessary.
Specific embodiments of an optical imaging system suitable for use in the above-described embodiments are further described below with reference to the drawings.
Detailed description of the preferred embodiment 1
Fig. 1 is a schematic view of a lens assembly according to embodiment 1 of the present invention, wherein the optical imaging system sequentially includes, from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, 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 forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative 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 concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive 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 plane S17.
As shown in table 1, a basic parameter table of the optical imaging system of example 1 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
| Flour mark | Surface type | Radius of curvature | Thickness/distance | Focal length | Refractive index | Coefficient of dispersion | Coefficient of cone |
| OBJ | Spherical surface | All-round | All-round | ||||
| STO | Spherical surface | All-round | -1.5000 | ||||
| S1 | Aspherical surface | 3.9409 | 2.1266 | 7.18 | 1.55 | 56.1 | -1.0397 |
| S2 | Aspherical surface | -549.9446 | 0.1981 | -95.7730 | |||
| S3 | Aspherical surface | 4.5778 | 0.5046 | -9.77 | 1.68 | 19.2 | 0.0446 |
| S4 | Aspherical surface | 2.5844 | 0.1327 | -1.0817 | |||
| S5 | Aspherical surface | 3.4679 | 1.3877 | 15.72 | 1.55 | 56.1 | 0.0032 |
| S6 | Aspherical surface | 4.9982 | 0.1063 | 0.2543 | |||
| S7 | Aspherical surface | 4.9345 | 0.4649 | -22.21 | 1.68 | 19.2 | 0.3933 |
| S8 | Aspherical surface | 3.5739 | 0.5469 | 0.1675 | |||
| S9 | Aspherical surface | 5.0629 | 0.4815 | 140.77 | 1.68 | 19.2 | 0.5888 |
| S10 | Aspherical surface | 5.1417 | 0.7613 | 0.9165 | |||
| S11 | Aspherical surface | 483.4549 | 0.9295 | 19.18 | 1.68 | 19.2 | 99.0000 |
| S12 | Aspherical surface | -13.3318 | 0.5717 | 25.5624 | |||
| S13 | Aspherical surface | 7.3702 | 0.4899 | -14.39 | 1.54 | 55.7 | -34.3546 |
| S14 | Aspherical surface | 3.6836 | 0.1698 | -0.2425 | |||
| S15 | Spherical surface | All-round | 0.2100 | 1.52 | 64.2 | ||
| S16 | Spherical surface | All-round | 0.5900 | ||||
| S17 | Spherical surface | All-round |
TABLE 1
As shown in table 2, in embodiment 1, the total effective focal length f of the optical imaging system is 8.47mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 9.67mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S17 is 3.39mm, and the half semifov of the maximum field angle of the optical imaging system is 20.3 °.
TABLE 2
The optical imaging system in embodiment 1 satisfies:
f/EPD is 1.27, wherein f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system;
(f1+ R1)/f is 1.31, where f1 is the effective focal length of the first lens, R1 is the radius of curvature of the object-side surface of the first lens, and f is the effective focal length of the optical imaging system;
f2/R3 is-2.13, where f2 is the effective focal length of the second lens and R3 is the radius of curvature of the object-side surface of the second lens;
f/R4 is 3.28, wherein f is the effective focal length of the optical imaging system, and R4 is the curvature radius of the image side surface of the second lens;
f6/R12 is-1.44, wherein f6 is the effective focal length of the sixth lens, and R12 is the curvature radius of the image side surface of the sixth lens;
f7/R14 is-3.91, wherein f7 is the effective focal length of the seventh lens, and R14 is the curvature radius of the image side surface of the seventh lens;
CT1/CT2 is 4.21, where CT1 is the central thickness of the first lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis;
CT3/CT5 is 2.88, where CT3 is the central thickness of the third lens on the optical axis, and CT5 is the central thickness of the fifth lens on the optical axis;
1/(T45×T34)＝17.20mm-2wherein T45 is an air space on the optical axis of the fourth lens and the fifth lens, and T34 is an air space on the optical axis of the third lens and the fourth lens;
a Semi-FOV is 20.3 °, wherein the Semi-FOV is half of the maximum field angle of the optical imaging system;
and the TTL/ImgH is 2.85, wherein the TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and the ImgH is half of the diagonal length of the effective pixel area on the imaging surface.
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); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface.
In example 1, the object-side surface and the image-side surface of any one of the first lens element E1 through the seventh lens element E7 are aspheric, and table 3 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S14 in example 14、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
TABLE 3
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 a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2c shows a distortion curve of the optical imaging system of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2d shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 1, 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. 2a to 2d, the optical imaging system according to embodiment 1 can achieve good imaging quality.
Specific example 2
Fig. 3 is a schematic diagram of a lens assembly structure according to embodiment 2 of the present invention, wherein the optical imaging system sequentially includes, from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, 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 forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative 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 concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave 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 plane S17.
As shown in table 4, a basic parameter table of the optical imaging system of example 2 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
| Flour mark | Surface type | Radius of curvature | Thickness/distance | Focal length | Refractive index | Coefficient of dispersion | Coefficient of cone |
| OBJ | Spherical surface | All-round | All-round | ||||
| STO | Spherical surface | All-round | -1.5000 | ||||
| S1 | Aspherical surface | 3.8979 | 2.0721 | 7.71 | 1.55 | 56.1 | -1.0234 |
| S2 | Aspherical surface | 43.0214 | 0.1055 | -14.5576 | |||
| S3 | Aspherical surface | 4.1553 | 0.4844 | -10.64 | 1.68 | 19.2 | 0.0164 |
| S4 | Aspherical surface | 2.5114 | 0.1459 | -1.0638 | |||
| S5 | Aspherical surface | 3.3256 | 1.4129 | 12.67 | 1.55 | 56.1 | -0.0156 |
| S6 | Aspherical surface | 5.4435 | 0.1000 | 0.1630 | |||
| S7 | Aspherical surface | 5.5112 | 0.4785 | -20.99 | 1.68 | 19.2 | 0.2100 |
| S8 | Aspherical surface | 3.8318 | 0.5388 | 0.2305 | |||
| S9 | Aspherical surface | 5.4738 | 0.4668 | -761.32 | 1.68 | 19.2 | 0.8750 |
| S10 | Aspherical surface | 5.2298 | 0.7527 | 0.5813 | |||
| S11 | Aspherical surface | 197.3376 | 0.8710 | 19.49 | 1.68 | 19.2 | 44.9351 |
| S12 | Aspherical surface | -14.1119 | 0.6058 | 27.2118 | |||
| S13 | Aspherical surface | 8.6418 | 0.5354 | -14.34 | 1.54 | 55.7 | -57.4010 |
| S14 | Aspherical surface | 3.9825 | 0.2213 | -0.3509 | |||
| S15 | Spherical surface | All-round | 0.2100 | 1.52 | 64.2 | ||
| S16 | Spherical surface | All-round | 0.5900 | ||||
| S17 | Spherical surface | All-round |
TABLE 4
As shown in table 5, in embodiment 2, the total effective focal length f of the optical imaging system is 8.45mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 9.59mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S17 is 3.39mm, and the half semifov of the maximum field angle of the optical imaging system is 20.5 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
TABLE 5
In example 2, the object-side surface and the image-side surface of any one of the first lens element E1 through the seventh lens element E7 are aspheric, and table 6 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S14 in example 24、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
TABLE 6
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 a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4c shows a distortion curve of the optical imaging system of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4d 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 4d, the optical imaging system according to embodiment 2 can achieve good imaging quality.
Specific example 3
Fig. 5 is a schematic view of a lens assembly according to embodiment 3 of the present invention, wherein the optical imaging system sequentially includes, from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, 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 forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative 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 concave image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive 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 plane S17.
As shown in table 7, a basic parameter table of the optical imaging system of example 3 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
| Flour mark | Surface type | Radius of curvature | Thickness/distance | Focal length | Refractive index | Coefficient of dispersion | Coefficient of cone |
| OBJ | Spherical surface | All-round | All-round | ||||
| STO | Spherical surface | All-round | -1.5000 | ||||
| S1 | Aspherical surface | 4.1695 | 2.0305 | 8.43 | 1.55 | 56.1 | -1.0002 |
| S2 | Aspherical surface | 36.8743 | 0.1367 | 3.9126 | |||
| S3 | Aspherical surface | 3.8345 | 0.5373 | -24.29 | 1.68 | 19.2 | 0.0800 |
| S4 | Aspherical surface | 2.9335 | 0.2291 | -1.1947 | |||
| S5 | Aspherical surface | 4.6156 | 1.4260 | 8.99 | 1.55 | 56.1 | -0.0136 |
| S6 | Aspherical surface | 69.2268 | 0.1000 | 78.8023 | |||
| S7 | Aspherical surface | -39.0000 | 0.5219 | -6.40 | 1.68 | 19.2 | -99.0000 |
| S8 | Aspherical surface | 4.8980 | 0.3850 | -0.6492 | |||
| S9 | Aspherical surface | 6.2214 | 0.5501 | 48.48 | 1.68 | 19.2 | 1.3845 |
| S10 | Aspherical surface | 7.4025 | 0.5408 | 1.5328 | |||
| S11 | Aspherical surface | 419.4797 | 1.3602 | 20.99 | 1.68 | 19.2 | 99.0000 |
| S12 | Aspherical surface | -14.6861 | 0.5099 | -98.9804 | |||
| S13 | Aspherical surface | 5.6397 | 0.7559 | -16.12 | 1.54 | 55.7 | -39.5964 |
| S14 | Aspherical surface | 3.2541 | 0.1609 | -0.1382 | |||
| S15 | Spherical surface | All-round | 0.2100 | 1.52 | 64.2 | ||
| S16 | Spherical surface | All-round | 0.5900 | ||||
| S17 | Spherical surface | All-round |
TABLE 7
As shown in table 8, in embodiment 3, the total effective focal length f of the optical imaging system is 8.26mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 10.04mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S17 is 3.39mm, and the half semifov of the maximum field angle of the optical imaging system is 21.2 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
TABLE 8
In example 3, the object-side surface and the image-side surface of any one of the first lens E1 to the seventh lens E7 are aspheric, and table 9 shows the high-order term coefficients a usable for the aspheric mirror surfaces S1 to S14 in example 34、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 2.3954E-01 | 1.1186E-02 | -2.3523E-03 | -1.9021E-03 | -1.4643E-03 | -9.1590E-04 | -3.4326E-04 |
| S2 | 1.2683E-01 | -5.3918E-03 | 5.9710E-04 | -1.0639E-03 | -1.5012E-03 | -3.9783E-04 | 3.7056E-04 |
| S3 | -1.7226E-01 | 3.6945E-03 | 9.5119E-03 | -8.6332E-04 | -3.0420E-03 | -2.2476E-03 | 3.7803E-04 |
| S4 | 5.6902E-02 | 7.4241E-03 | 1.0773E-02 | -1.9529E-03 | -1.4525E-03 | -2.7326E-03 | -1.5772E-04 |
| S5 | 1.1695E-01 | 3.0560E-02 | 9.6656E-03 | -2.7291E-03 | 4.1129E-04 | -7.7820E-04 | 5.7339E-04 |
| S6 | -8.5342E-02 | 1.2588E-02 | -5.9307E-03 | -1.7279E-03 | -2.0634E-04 | 4.7163E-04 | 5.8665E-04 |
| S7 | -7.2794E-02 | -1.5801E-02 | -2.1721E-03 | -1.1755E-03 | -8.8224E-04 | 6.0591E-04 | 3.8864E-04 |
| S8 | -5.7552E-03 | -1.2523E-02 | 7.5871E-03 | 6.4522E-03 | 1.9585E-03 | 1.0976E-03 | -1.9728E-04 |
| S9 | -3.4679E-01 | 1.8704E-02 | 7.7272E-03 | 5.4865E-03 | 1.4044E-03 | 9.6670E-04 | 3.1265E-04 |
| S10 | -3.7555E-01 | 5.3447E-02 | 8.0707E-03 | -2.1498E-03 | -3.4940E-03 | -1.3795E-03 | -4.3539E-04 |
| S11 | -4.0993E-01 | -2.8796E-02 | 1.9471E-03 | 2.1298E-03 | 1.0601E-03 | 6.2034E-04 | -1.8666E-04 |
| S12 | -6.2401E-01 | 3.7228E-02 | 7.0994E-03 | 1.5470E-02 | 6.9878E-03 | 5.4830E-03 | 2.6360E-03 |
| S13 | -1.6400E+00 | 2.7346E-01 | 1.0425E-01 | 1.1340E-01 | 5.7232E-02 | 1.9863E-02 | 1.9463E-03 |
| S14 | -2.8112E+00 | 5.5578E-02 | -1.0099E-01 | 1.2161E-03 | -8.7023E-03 | -1.4648E-03 | -7.0738E-04 |
| Flour mark | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -6.0247E-05 | 2.5524E-05 | 3.4204E-05 | 3.8673E-05 | 1.8414E-05 | 5.8313E-06 | -1.9720E-06 |
| S2 | -5.2377E-05 | 1.5626E-04 | 5.4003E-05 | 6.5713E-05 | 1.0253E-05 | 2.0421E-05 | 5.4293E-06 |
| S3 | -2.6690E-05 | 1.3126E-04 | 2.3986E-04 | 1.9691E-04 | 7.4624E-05 | 3.9310E-05 | 2.2894E-05 |
| S4 | -9.9557E-07 | -2.7442E-04 | -9.3523E-05 | 5.9657E-05 | 2.2812E-05 | -1.6571E-06 | 1.1303E-05 |
| S5 | 2.9680E-04 | -1.7736E-04 | -4.1737E-05 | 7.6479E-05 | 2.2344E-05 | 7.0443E-06 | 1.2171E-05 |
| S6 | 5.6137E-04 | 3.1785E-04 | 1.9216E-04 | 8.8316E-05 | 4.2737E-05 | 1.8663E-05 | 8.9051E-06 |
| S7 | 3.3084E-04 | 8.4389E-05 | 3.0237E-05 | -9.5138E-06 | -7.6087E-06 | -5.7633E-06 | -4.3446E-07 |
| S8 | -6.2742E-04 | -6.5853E-04 | -4.2122E-04 | -1.8760E-04 | -3.9421E-05 | 1.0538E-05 | 1.0115E-05 |
| S9 | -7.0852E-05 | -2.2043E-04 | -1.5728E-04 | -6.5121E-05 | 4.7828E-06 | 1.7915E-05 | 1.2234E-05 |
| S10 | 3.0452E-04 | 7.3112E-04 | 8.2777E-04 | 6.3433E-04 | 3.6973E-04 | 1.4819E-04 | 3.9332E-05 |
| S11 | -1.9266E-04 | 1.2697E-04 | 3.8832E-04 | 3.7473E-04 | 2.4974E-04 | 1.0650E-04 | 3.2592E-05 |
| S12 | 1.4103E-03 | 7.1118E-04 | 4.2391E-04 | 2.3606E-04 | 1.1182E-04 | 3.1469E-05 | 2.2009E-05 |
| S13 | -2.5150E-03 | -1.0875E-03 | -3.4063E-04 | -1.1718E-04 | -2.1840E-04 | -8.4564E-05 | 3.3521E-05 |
| S14 | -8.3822E-04 | -1.5090E-04 | -3.3991E-04 | 5.2807E-05 | -5.9656E-05 | -2.8274E-05 | -1.0826E-04 |
TABLE 9
Fig. 6a shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6c shows a distortion curve of the optical imaging system of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6d shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 3, 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. 6a to 6d, the optical imaging system according to embodiment 3 can achieve good imaging quality.
Specific example 4
Fig. 7 is a schematic diagram of a lens assembly structure according to embodiment 4 of the present invention, wherein the optical imaging system sequentially includes, from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, 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 forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative 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 convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive 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 plane S17.
As shown in table 10, the basic parameter table of the optical imaging system of example 4 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
| Flour mark | Surface type | Radius of curvature | Thickness/distance | Focal length | Refractive index | Coefficient of dispersion | Coefficient of cone |
| OBJ | Spherical surface | All-round | All-round | ||||
| STO | Spherical surface | All-round | -1.5000 | ||||
| S1 | Aspherical surface | 4.0980 | 2.0281 | 8.13 | 1.55 | 56.1 | -0.9926 |
| S2 | Aspherical surface | 43.7879 | 0.1035 | 3.3036 | |||
| S3 | Aspherical surface | 3.9894 | 0.5280 | -24.96 | 1.68 | 19.2 | 0.0609 |
| S4 | Aspherical surface | 3.0551 | 0.4418 | -1.1423 | |||
| S5 | Aspherical surface | 5.3528 | 1.4326 | 9.00 | 1.55 | 56.1 | -0.1526 |
| S6 | Aspherical surface | -54.1332 | 0.1000 | -93.1417 | |||
| S7 | Aspherical surface | 265.3639 | 0.5382 | -5.73 | 1.68 | 19.2 | 99.0000 |
| S8 | Aspherical surface | 3.8180 | 0.3712 | 0.0220 | |||
| S9 | Aspherical surface | 4.5018 | 0.5454 | 52.39 | 1.68 | 19.2 | 1.3217 |
| S10 | Aspherical surface | 4.9041 | 0.5109 | 0.7616 | |||
| S11 | Aspherical surface | 52.4741 | 1.1390 | 19.58 | 1.68 | 19.2 | 99.0000 |
| S12 | Aspherical surface | -17.5745 | 0.4090 | 40.6580 | |||
| S13 | Aspherical surface | 8.7034 | 1.0517 | -16.07 | 1.54 | 55.7 | -38.7732 |
| S14 | Aspherical surface | 4.1488 | 0.1180 | 0.5748 | |||
| S15 | Spherical surface | All-round | 0.2100 | 1.52 | 64.2 | ||
| S16 | Spherical surface | All-round | 0.5900 | ||||
| S17 | Spherical surface | All-round |
As shown in table 11, in embodiment 4, the total effective focal length f of the optical imaging system is 8.39mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 10.12mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S17 is 3.39mm, and the half semifov of the maximum field angle of the optical imaging system is 21.3 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
TABLE 11
In example 4, the object-side surface and the image-side surface of any one of the first lens E1 to the seventh lens E7 are aspheric, and table 12 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S14 in example 44、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
TABLE 12
Fig. 8a shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 8b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8c shows a distortion curve of the optical imaging system of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8d 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 8d, the optical imaging system according to embodiment 4 can achieve good imaging quality.
Specific example 5
Fig. 9 is a schematic view of a lens assembly structure according to embodiment 5 of the present invention, wherein the optical imaging system sequentially includes, from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, 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 forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative 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 concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive 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 plane S17.
As shown in table 13, the basic parameter table of the optical imaging system of example 5 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Watch 13
As shown in table 14, in example 5, the total effective focal length f of the optical imaging system is 8.48mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 9.59mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S17 is 3.39mm, and the half semifov of the maximum field angle of the optical imaging system is 20.5 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
TABLE 14
In example 5, the object-side surface and the image-side surface of any one of the first lens element E1 through the seventh lens element E7 are aspheric, and table 15 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S14 in example 54、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
Watch 15
Fig. 10a shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 5, which represents the deviation of the convergent focal points 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 distortion curve of the optical imaging system of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10d shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 5, 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. 10a to 10d, the optical imaging system according to embodiment 5 can achieve good imaging quality.
Specific example 6
Fig. 11 is a schematic view of a lens assembly according to embodiment 6 of the present invention, wherein the optical imaging system sequentially includes, from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, 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 forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive 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 plane S17.
As shown in table 16, the basic parameter table of the optical imaging system of example 6 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
| Flour mark | Surface type | Radius of curvature | Thickness/distance | Focal length | Refractive index | Coefficient of dispersion | Coefficient of cone |
| OBJ | Spherical surface | All-round | All-round | ||||
| STO | Spherical surface | All-round | -1.5000 | ||||
| S1 | Aspherical surface | 3.8273 | 2.1690 | 7.05 | 1.55 | 56.1 | -0.9909 |
| S2 | Aspherical surface | 600.0000 | 0.1000 | -99.0000 | |||
| S3 | Aspherical surface | 4.7283 | 0.4600 | -11.86 | 1.68 | 19.2 | -0.0076 |
| S4 | Aspherical surface | 2.8584 | 0.1662 | -0.9970 | |||
| S5 | Aspherical surface | 4.1958 | 1.4069 | -280.00 | 1.55 | 56.1 | 0.2856 |
| S6 | Aspherical surface | 3.6001 | 0.1000 | -0.3369 | |||
| S7 | Aspherical surface | 4.1629 | 0.4600 | -222.93 | 1.68 | 19.2 | 0.1151 |
| S8 | Aspherical surface | 3.8705 | 0.5722 | 0.1291 | |||
| S9 | Aspherical surface | 4.5180 | 0.6134 | 145.53 | 1.68 | 19.2 | 0.3757 |
| S10 | Aspherical surface | 4.4756 | 0.7984 | 0.0201 | |||
| S11 | Aspherical surface | 33.8210 | 0.9197 | 41.48 | 1.68 | 19.2 | 98.9796 |
| S12 | Aspherical surface | -163.6911 | 0.6236 | 6.4766 | |||
| S13 | Aspherical surface | 5.0427 | 0.4608 | -35.10 | 1.54 | 55.7 | -19.1629 |
| S14 | Aspherical surface | 3.8507 | 0.3649 | -0.4707 | |||
| S15 | Spherical surface | All-round | 0.2100 | 1.52 | 64.2 | ||
| S16 | Spherical surface | All-round | 0.5900 | ||||
| S17 | Spherical surface | All-round |
TABLE 16
As shown in table 17, in example 6, the total effective focal length f of the optical imaging system is 8.98mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 10.01mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S17 is 3.39mm, and the half semifov of the maximum field angle of the optical imaging system is 19.8 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
TABLE 17
In example 6, the object-side surface and the image-side surface of any one of the first lens E1 to the seventh lens E7 are aspheric, and table 18 shows that each aspheric surface that can be used in example 6 is used in example 6High-order coefficient A of mirror surface S1-S144、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 2.4034E-01 | 1.1825E-02 | -5.1828E-04 | -9.0917E-05 | -1.9568E-04 | 5.5722E-06 | -3.8252E-05 |
| S2 | 1.2156E-01 | -3.7785E-03 | -7.9473E-04 | 8.0710E-04 | -8.6777E-04 | 4.5328E-04 | -1.9717E-04 |
| S3 | -2.3581E-01 | 1.0411E-02 | 5.8300E-03 | -2.9655E-04 | -5.9586E-04 | 2.6709E-05 | 1.2824E-04 |
| S4 | 1.0310E-01 | -9.4270E-04 | 1.0923E-02 | -1.0201E-03 | -3.6906E-04 | -1.2492E-03 | 8.1149E-04 |
| S5 | 1.7773E-01 | 2.6450E-02 | 8.9354E-03 | -4.9126E-04 | -9.0176E-05 | -1.0596E-03 | 7.5828E-04 |
| S6 | -1.2504E-01 | 3.5996E-02 | -9.7009E-03 | -3.7872E-04 | -1.3158E-03 | 6.4766E-04 | 4.0886E-04 |
| S7 | -6.3504E-02 | 2.4256E-05 | -7.3406E-03 | 3.0464E-03 | -1.3593E-03 | 5.5946E-04 | 8.7825E-05 |
| S8 | 9.4380E-03 | -4.6016E-04 | 5.9550E-03 | 7.0194E-03 | 1.3182E-03 | 6.3233E-04 | 8.4442E-05 |
| S9 | -3.6307E-01 | 1.3274E-02 | 9.6762E-03 | 5.2494E-03 | -2.5749E-04 | -8.3587E-04 | -5.6065E-04 |
| S10 | -3.4968E-01 | 2.7763E-02 | 8.7397E-03 | 1.7439E-03 | -1.6945E-03 | -1.1230E-03 | -4.8536E-04 |
| S11 | -4.3189E-01 | -2.5753E-02 | 4.8492E-03 | 2.5483E-03 | -1.0153E-03 | -1.0726E-03 | -5.8781E-04 |
| S12 | -5.8701E-01 | 1.1133E-02 | 7.0371E-03 | 5.3844E-03 | -4.3910E-04 | 6.1045E-04 | 2.9769E-04 |
| S13 | -1.4255E+00 | 1.7486E-01 | -5.1849E-03 | 3.2218E-02 | 1.2697E-02 | 9.0590E-03 | 1.3753E-03 |
| S14 | -2.2529E+00 | 1.3388E-01 | -6.6399E-02 | 9.2686E-03 | 1.7297E-03 | 9.1067E-03 | 6.6294E-03 |
| Flour mark | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -1.0478E-05 | -2.4531E-05 | 1.7106E-05 | -2.4324E-06 | 8.3042E-06 | 1.6473E-06 | 3.2704E-06 |
| S2 | 2.4012E-05 | 9.7109E-05 | -3.6229E-05 | 1.1827E-05 | 1.5046E-05 | -7.5064E-06 | -1.6287E-08 |
| S3 | -1.9241E-04 | 1.3605E-04 | 2.4099E-05 | -7.1240E-05 | 5.0201E-05 | -1.8192E-05 | 2.7135E-06 |
| S4 | 1.6482E-04 | 9.1606E-05 | 1.3372E-04 | -1.5014E-04 | -9.7830E-06 | 2.7867E-05 | 8.4660E-07 |
| S5 | 3.2722E-04 | 5.5503E-05 | 1.1552E-04 | -1.3200E-04 | -3.1969E-05 | 1.8711E-05 | 1.0578E-05 |
| S6 | -1.2698E-04 | -1.5222E-04 | -5.1677E-05 | -2.6180E-05 | -5.1485E-06 | 1.4725E-05 | 5.2138E-07 |
| S7 | -3.1616E-04 | -2.0821E-04 | -4.7012E-05 | -1.2042E-05 | 3.3232E-06 | 1.4334E-05 | 1.2069E-06 |
| S8 | -1.0719E-04 | -1.0383E-04 | -5.1321E-05 | -2.5681E-05 | -1.0001E-05 | -8.7650E-08 | 9.4910E-07 |
| S9 | -2.1435E-04 | -8.1660E-05 | -1.4801E-05 | -1.3111E-05 | -3.1849E-06 | -5.2476E-06 | 2.3136E-06 |
| S10 | -1.0863E-04 | 1.1827E-05 | 4.7273E-05 | 2.8668E-05 | 1.4709E-05 | 1.9160E-06 | -3.4283E-08 |
| S11 | -1.8664E-04 | -7.7572E-05 | -2.6572E-05 | -9.9863E-06 | 1.6823E-05 | 1.3399E-05 | 9.4726E-06 |
| S12 | 3.0794E-04 | 7.6917E-05 | 3.7559E-05 | 1.1585E-06 | 2.3230E-05 | 1.7468E-05 | 1.4250E-05 |
| S13 | -1.8343E-03 | -2.5791E-03 | -1.3588E-03 | -3.7660E-04 | 3.1050E-04 | 3.3745E-04 | 2.3561E-04 |
| S14 | 5.3976E-03 | 3.2062E-03 | 1.9428E-03 | 8.5089E-04 | 3.8748E-04 | 7.7482E-05 | 1.0873E-04 |
Watch 18
Fig. 12a shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 6, which represents the deviation of the convergent focal points 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 distortion curve of the optical imaging system of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12d shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 6, 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. 12a to 12d, the optical imaging system according to embodiment 6 can achieve good imaging quality.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, improvements, equivalents, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (22)
1. An optical imaging system, in order from an object side to an image side along an optical axis, comprising:
a diaphragm;
a first lens having an optical power;
a second lens having a negative optical power;
a third lens having optical power;
a fourth lens having a negative optical power;
a fifth lens having optical power;
the image side surface of the sixth lens is a convex surface;
a seventh lens having optical power;
wherein the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.4.
2. The optical imaging system of claim 1, wherein: an effective focal length f1 of the first lens, a radius of curvature R1 of an object-side surface of the first lens, and an effective focal length f of the optical imaging system satisfy: 1.0 < (f1+ R1)/f < 1.6.
3. The optical imaging system of claim 1, wherein: an effective focal length f2 of the second lens and a radius of curvature R3 of an object side of the second lens satisfy: -6.5 < f2/R3< -2.0.
4. The optical imaging system of claim 1, wherein: the effective focal length f of the optical imaging system and the curvature radius R4 of the image side surface of the second lens meet the following conditions: f/R4 is more than 2.5 and less than or equal to 3.5.
5. The optical imaging system of claim 1, wherein: the effective focal length f6 of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy that: -2.0 < f6/R12< 0.
6. The optical imaging system of claim 1, wherein: an effective focal length f7 of the seventh lens and a curvature radius R14 of an image side surface of the seventh lens satisfy: -9.5 < f7/R14< -2.5.
7. The optical imaging system of claim 1, 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 satisfy: 3.5 < CT1/CT2< 5.0.
8. The optical imaging system of claim 1, wherein: the central thickness CT3 of the third lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy that: 2.0 < CT3/CT5< 3.5.
9. The optical imaging system of claim 1, wherein: an air interval T45 of the fourth lens and the fifth lens on the optical axis and an air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 17.0mm-2＜1/(T45×T34)＜27.0mm-2。
10. The optical imaging system of claim 1, wherein: half of the Semi-FOV of the maximum field angle of the optical imaging system satisfies: 10.0 DEG < Semi-FOV < 30.0 deg.
11. The optical imaging system of claim 1, wherein: the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH is more than 2.5 and less than 3.0.
12. An optical imaging system, in order from an object side to an image side along an optical axis, comprising:
a diaphragm;
a first lens having an optical power;
a second lens having a negative optical power;
a third lens having optical power;
a fourth lens having a negative optical power;
a fifth lens having optical power;
the image side surface of the sixth lens is a convex surface;
a seventh lens having optical power;
wherein an effective focal length f1 of the first lens, a radius of curvature R1 of the object-side surface of the first lens, and an effective focal length f of the optical imaging system satisfy: 1.0 < (f1+ R1)/f < 1.6.
13. The optical imaging system of claim 12, wherein: the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.4.
14. The optical imaging system of claim 12, wherein: an effective focal length f2 of the second lens and a radius of curvature R3 of an object side of the second lens satisfy: -6.5 < f2/R3< -2.0.
15. The optical imaging system of claim 12, wherein: the effective focal length f of the optical imaging system and the curvature radius R4 of the image side surface of the second lens meet the following conditions: f/R4 is more than 2.5 and less than or equal to 3.5.
16. The optical imaging system of claim 12, wherein: the effective focal length f6 of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy that: -2.0 < f6/R12< 0.
17. The optical imaging system of claim 12, wherein: an effective focal length f7 of the seventh lens and a curvature radius R14 of an image side surface of the seventh lens satisfy: -9.5 < f7/R14< -2.5.
18. The optical imaging system of claim 12, 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 satisfy: 3.5 < CT1/CT2< 5.0.
19. The optical imaging system of claim 12, wherein: the central thickness CT3 of the third lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy that: 2.0 < CT3/CT5< 3.5.
20. The optical imaging system of claim 12, wherein: an air interval T45 of the fourth lens and the fifth lens on the optical axis and an air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 17.0mm-2＜1/(T45×T34)＜27.0mm-2。
21. The optical imaging system of claim 12, wherein: half of the Semi-FOV of the maximum field angle of the optical imaging system satisfies: 10.0 DEG < Semi-FOV < 30.0 deg.
22. The optical imaging system of claim 12, wherein: the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH is more than 2.5 and less than 3.0.
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