CN211086751U - Optical imaging system - Google Patents
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- CN211086751U CN211086751U CN201921412252.XU CN201921412252U CN211086751U CN 211086751 U CN211086751 U CN 211086751U CN 201921412252 U CN201921412252 U CN 201921412252U CN 211086751 U CN211086751 U CN 211086751U
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Abstract
The application discloses an optical imaging system which sequentially comprises a first lens with focal power, a second lens with positive focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens with focal power, a sixth lens with positive focal power, a seventh lens with negative focal power, an effective focal length f of the optical imaging system and a maximum field angle FOV of the optical imaging system satisfy f × tan (FOV/2) > 4.0mm, and a curvature radius R9 of the effective focal length f of the optical imaging system and an object side surface of the fifth lens satisfies 0 < f/R9 < 1.0 from an object side to an image side along an optical axis.
Description
Technical Field
The present application relates to an optical imaging system, and more particularly, to an optical imaging system including seven lenses.
Background
With the upgrading of consumer electronics products represented by mobile phones and the development of image software functions and video software functions on the consumer electronics products, the market demand for optical imaging systems suitable for portable electronics products is increasing.
The imaging quality of the mobile phone in night or dark environment is poor, so the market expects the mobile phone with good night shooting effect, and the size of the mobile phone and other portable devices limits the size of the optical imaging system arranged on the mobile phone. In order to meet the miniaturization requirement and meet the imaging requirement, an optical imaging system which can achieve both miniaturization and large image plane, large aperture and high imaging quality is required.
SUMMERY OF THE UTILITY MODEL
The present application provides an optical imaging system applicable to portable electronic products that may address, at least in part, at least one of the above-identified deficiencies in the prior art.
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 refractive power, the object side surface of which may be convex; a second lens having a positive optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; the image side surface of the sixth lens with positive focal power can be a convex surface; a seventh lens having a negative optical power.
In one embodiment, the effective focal length f of the optical imaging system and the maximum field angle FOV of the optical imaging system may satisfy f × tan (FOV/2) > 4.0 mm.
In one embodiment, the effective focal length f of the optical imaging system and the radius of curvature R9 of the object side surface of the fifth lens may satisfy 0 < f/R9 < 1.0.
In one embodiment, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, and the effective focal length f of the optical imaging system may satisfy 10 × R2-R3/f < 0.5.
In one embodiment, the first lens and the second lens are separated by a distance T12 on the optical axis, the first lens has a center thickness CT1 on the optical axis, and the second lens has a center thickness CT2 on the optical axis, which satisfies T12/(CT2-CT1) ≦ 0.2.
In one embodiment, the first lens and the second lens are spaced apart by a distance T12 on the optical axis, the first lens has a center thickness CT1 on the optical axis, and the second lens has a center thickness CT2 on the optical axis, which satisfy 0 < T12/(CT2-CT1) ≦ 0.2.
In one embodiment, the separation distance T45 on the optical axis of the fourth lens and the fifth lens, the separation distance T56 on the optical axis of the fifth lens and the sixth lens, and the separation distance T67 on the optical axis of the sixth lens and the seventh lens may satisfy 1 ≦ T45-T56|/| T56-T67| < 4.
In one embodiment, the optical imaging system satisfies the conditional expression | T12-ET12| × 10 < 1.0mm, where ET12 is the edge separation distance between the first lens and the second lens, and T12 is the separation distance of the first lens and the second lens on the optical axis.
In one embodiment, ET12 is the distance from the other surface in a direction parallel to the optical axis at the larger of the maximum effective radius of the image-side surface of the first lens and the maximum effective radius of the object-side surface of the second lens.
In one embodiment, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis may satisfy 0.4mm ≦ (CT4+ CT5+ CT7)/3 < 0.6 mm.
In one embodiment, the effective focal length f of the optical imaging system and the combined focal length f12 of the first and second lenses may satisfy 1 ≦ f/f12 < 1.3.
In one embodiment, the effective focal length f of the optical imaging system and the effective focal length f3 of the third lens can satisfy-0.5 ≦ f/f3 < 0.
In one embodiment, the effective focal length f of the optical imaging system, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens can satisfy | f/f4| + | f/f5| ≦ 0.3.
In one embodiment, the effective focal length f6 of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis can satisfy f6/CT6 < 5.0.
In one embodiment, the effective focal length f of the optical imaging system and the radius of curvature R1 of the object side surface of the first lens may satisfy 2 < f/R1 < 3.
In one embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens may satisfy 1 < R5/R6 < 2.
In one embodiment, the effective focal length f of the optical imaging system, the entrance pupil diameter EPD of the optical imaging system, and half ImgH of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system may satisfy f/(EPD × ImgH) < 0.5mm-1。
In one embodiment, the optical imaging system further comprises a diaphragm, and a distance S L between the diaphragm and an imaging surface of the optical imaging system on an optical axis and a distance TT L between an object side surface of the first lens and the imaging surface on the optical axis can satisfy 0.7 < S L/TT L ≦ 0.9.
The optical imaging system has the advantages that the seven lenses are adopted, the focal power, the surface type and the center thickness of each lens and the on-axis distance between the lenses are reasonably distributed, so that the optical imaging system has at least one beneficial effect of large image surface, large aperture, high imaging quality, miniaturization and the like.
Drawings
Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application; fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration 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 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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.
The optical imaging system according to the exemplary embodiment of the present application may include, for example, seven lenses having optical powers, i.e., 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 in sequence from the object side to the image side along the optical axis. In the first to seventh lenses, any adjacent two lenses may have an air space therebetween.
In an exemplary embodiment, the first lens has a positive or negative power, and the object side surface thereof may be convex; the second lens may have a positive optical power; the third lens has positive focal power or negative focal power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive focal power or negative focal power; the sixth lens can have positive focal power, and the image side surface of the sixth lens can be convex; the seventh lens may have a negative optical power. The low-order aberration of the control system is effectively balanced by reasonably controlling the positive and negative distribution of the focal power of each component of the system and the lens surface curvature.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression f × tan (FOV/2) > 4.0mm, where f is an effective focal length of the optical imaging system and the FOV is a maximum field angle of the optical imaging system, and more particularly, f and the FOV may satisfy f × tan (FOV/2) > 4.5 mm.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0 < f/R9 < 1.0, where f is an effective focal length of the optical imaging system, and R9 is a radius of curvature of an object-side surface of the fifth lens. More specifically, f and R9 may satisfy 0.21 < f/R9 < 0.88. The ratio of the effective focal length of the optical imaging system to the curvature radius of the object side surface of the fifth lens is controlled, so that the optical imaging system is miniaturized, the aberration of the optical imaging system is corrected, the aperture difference among the lenses is balanced, and the optical imaging system has good assembly stability and is beneficial to the stability of an assembly process.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 10 × | R2-R3|/f < 0.5, where R2 is a radius of curvature of an image-side surface of the first lens, R3 is a radius of curvature of an object-side surface of the second lens, and f is an effective focal length of the optical imaging system, and more particularly, R2, R3, and f may satisfy 0 ≦ 10 × | R2-R3|/f < 0.35.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression T12/(CT2-CT1) ≦ 0.2, where T12 is a separation distance of the first lens and the second lens on the optical axis, CT1 is a center thickness of the first lens on the optical axis, and CT2 is a center thickness of the second lens on the optical axis. Through controlling the air interval between the first lens and the second lens and the respective central thickness of the first lens and the second lens, the intensity of ghost images generated by the first lens and the second lens can be effectively reduced, the imaging quality of the optical imaging system is improved, in addition, the thicknesses of the first lens and the second lens can be matched, and the optical imaging system is enabled to have good assembly stability.
In an exemplary embodiment, T12, CT1, and CT2 can satisfy 0 < T12/(CT2-CT1) ≦ 0.2. More specifically, T12, CT1 and CT2 satisfy 0.08 < T12/(CT2-CT1) ≦ 0.18. By arranging the second lens to be thicker than the first lens, the total optical length of the optical imaging system can be effectively reduced, and astigmatism contributed by the first lens and the second lens is weakened.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1 ≦ T45-T56|/| T56-T67| < 4, where T45 is a separation distance of the fourth lens and the fifth lens on the optical axis, T56 is a separation distance of the fifth lens and the sixth lens on the optical axis, and T67 is a separation distance of the sixth lens and the seventh lens on the optical axis. More specifically, T45, T56, and T67 can satisfy 1.05 ≦ T45-T56|/| T56-T67| < 3.9. By controlling the air interval between the adjacent lenses in the fourth lens to the seventh lens, the processability of each lens is improved, the optical imaging system is easy to assemble, the extrusion interference of the adjacent lenses during the assembly of the optical imaging system is avoided, the deflection of light rays at the positions from the fourth lens to the seventh lens is reduced, the field curvature of the optical imaging system is adjusted, the sensitivity of the optical imaging system is reduced, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression | T12-ET12| × 10 < 1.0mm, where ET12 is an edge separation distance between the first lens and the second lens, and T12 is a separation distance between the first lens and the second lens on the optical axis, more specifically, T12 and ET12 may satisfy | T12-ET12| × 10 < 0.9 mm.
Illustratively, when the maximum effective radius of the image-side surface of the first lens is larger than the maximum effective radius of the object-side surface of the second lens, the first lens and the second lens are spaced apart in a direction parallel to the optical axis at the maximum effective radius of the image-side surface of the first lens, i.e., an edge spacing distance ET 12; when the maximum effective radius of the object side surface of the second lens is larger than the maximum effective radius of the image side surface of the first lens, the edge separation distance ET12, which is the separation distance between the first lens and the second lens in the direction parallel to the optical axis at the maximum effective radius of the object side surface of the second lens; when the maximum effective radius of the image-side surface of the first lens is equal to the maximum effective radius of the object-side surface of the second lens, the first lens and the second lens are spaced apart by an edge spacing distance ET12 in a direction parallel to the optical axis at the maximum effective radius of either the image-side surface of the first lens or the object-side surface of the second lens. Illustratively, when the maximum effective radius of the image-side surface of the first lens is larger than the maximum effective radius of the object-side surface of the second lens and is also larger than the maximum radius of the object-side surface of the second lens, the first lens and the second lens are spaced apart by an edge spacing distance ET12 in a direction parallel to the optical axis at the maximum radius of the object-side surface of the second lens.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression of 0.4mm ≦ (CT4+ CT5+ CT7)/3 < 0.6mm, where CT4 is a central thickness of the fourth lens on the optical axis, CT5 is a central thickness of the fifth lens on the optical axis, and CT7 is a central thickness of the seventh lens on the optical axis. More specifically, CT4, CT5 and CT7 can satisfy 0.44mm ≦ (CT4+ CT5+ CT7)/3 < 0.51 mm. By controlling the central thickness of the fourth lens, the central thickness of the fifth lens and the central thickness of the seventh lens, the processing manufacturability of each lens is favorably improved, on one hand, each lens is not too thin, so that the lenses are easy to manufacture and mold and have good assembly stability, on the other hand, each lens is not too thick, so that the internal stress of each lens is small, and in addition, the ghost image intensity of the optical imaging system brought by the fourth lens to the seventh lens is favorably weakened.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1 ≦ f/f12 < 1.3, where f is an effective focal length of the optical imaging system, and f12 is a combined focal length of the first lens and the second lens. More specifically, f and f12 can satisfy 1.02 ≦ f/f12 < 1.20. Effective focal length through control optical imaging system and the ratio of the combined focal length of first lens and second lens, be favorable to reducing the sensitivity of first lens and second lens, make first lens and second lens can have more loose tolerance and then promoted the processing manufacturability, still be favorable to making the astigmatism that first lens brought, the astigmatism that coma and second lens brought, the complementary elimination that coma corresponds, and then promote optical imaging system's imaging quality, make optical imaging system have better power of resolving an image.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression-0.5 ≦ f/f3 < 0, where f is an effective focal length of the optical imaging system, and f3 is an effective focal length of the third lens. More specifically, f and f3 can satisfy-0.48 ≦ f/f3 < -0.32. Through the ratio of the effective focal length of the optical imaging system to the effective focal length of the third lens, on one hand, the spherical aberration and astigmatism of the optical imaging system can be better eliminated, and on the other hand, the trend of light in the optical imaging system can be controlled, the light is prevented from being too steep, and the sensitivity of the optical imaging system is further weakened.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression | f/f4| + | f/f5| ≦ 0.3, where f is an effective focal length of the optical imaging system, f4 is an effective focal length of the fourth lens, and f5 is an effective focal length of the fifth lens. More specifically, f4 and f5 satisfy | f/f4| + | f/f5| ≦ 0.28. Through the effective focal length of controlling fourth lens and the effective focal length of fifth lens, be favorable to making optical imaging system have shorter size in the optical axis direction, realize optical imaging system's miniaturization and ultra-thin characteristic, optical imaging system's focal power distribution is balanced simultaneously, in addition, cooperates first lens to third lens, is favorable to correcting optical imaging system's aberration.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression f6/CT6 < 5.0, where f6 is an effective focal length of the sixth lens and CT6 is a center thickness of the sixth lens on an optical axis. More specifically, f6 and CT6 satisfy 2.9 < f6/CT6 < 4.4. Through the ratio of the effective focal length of the sixth lens to the central thickness of the sixth lens, the light rays at the sixth lens are favorably and better converged on one hand, so that the optical imaging system has a larger imaging surface, the thickness of the sixth lens is favorably controlled on the other hand, the focal power concentration caused by the over-thickness of the sixth lens is avoided, and the aberration of the optical imaging system is favorably corrected.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 2 < f/R1 < 3, where f is an effective focal length of the optical imaging system, and R1 is a radius of curvature of an object-side surface of the first lens. More specifically, f and R1 can satisfy 2.1 < f/R1 < 2.6. By controlling the ratio of the effective focal length of the optical imaging system to the curvature radius of the object side surface of the first lens, the deflection of light rays at the first lens can be reduced, the sensitivity of the first lens can be further reduced, and the spherical aberration generated by the first lens can be reduced.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1 < R5/R6 < 2, where R5 is a radius of curvature of an object-side surface of the third lens and R6 is a radius of curvature of an image-side surface of the third lens. More specifically, R5 and R6 may satisfy 1.38 < R5/R6 < 1.93. By controlling the ratio of the curvature radiuses of the mirror surfaces on the two sides of the third lens, the length of the first lens to the length of the third lens on the optical axis can be reduced, the focal power of the optical imaging system can be distributed in a balanced mode, the focal power is prevented from being concentrated on the third lens, in addition, the aberration of the lens in the object side direction of the third lens can be corrected, and the imaging quality of the optical imaging system can be improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression f/(EPD × ImgH) < 0.5mm-1Where f is an effective focal length of the optical imaging system, EPD is an entrance pupil diameter of the optical imaging system, and ImgH is a half of a diagonal length of an effective pixel area on an imaging plane of the optical imaging system. More specifically, f, EPD and ImgH may satisfy 0.3mm-1＜f/(EPD×ImgH)＜0.4mm-1. By controlling the effective focal length, the entrance pupil diameter and the image height of the optical imaging system, the optical imaging system can have a large aperture at the same time when having a large imaging surface, so that the relative illumination of the optical imaging system is higher, the resolution is improved, the light flux is increased, the image information acquired by the optical imaging system is more, and the optical imaging system still has good imaging capability in a dark environment.
The optical imaging system may satisfy the conditional expression 0.7 < S L/TT L ≦ 0.9, where S L is a distance on an optical axis from an imaging surface of the optical imaging system and TT L is a distance on the optical axis from an object side surface of the first lens to the imaging surface, more specifically, S L and TT L may satisfy 0.79 < S L/TT L ≦ 0.89.
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 volume of the imaging system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the processability of the imaging system can be improved, so that the optical imaging system is more favorable for production and processing and can be suitable for portable electronic products. Meanwhile, the optical imaging system further has excellent optical performances such as large image plane, large aperture, high imaging quality and miniaturization.
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, the object-side surface and the image-side surface of each of the third lens to the seventh lens are aspheric lenses. 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 2D. 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 along an optical axis, 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, and a filter E8.
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 positive 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 positive 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 concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The optical imaging system has an imaging plane S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane 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 embodiment 1, the value of the effective focal length f of the optical imaging system is 5.70mm, and the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.38 mm.
In embodiment 1, the object-side surface S1 of the first lens element E1, the image-side surface S4 of the second lens element E2, and any one of the object-side surface and the image-side surface of the third lens element E3 to the seventh lens element E7 are aspheric, and the surface type x of each aspheric lens can be defined by, but is not limited to, the following aspheric 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 coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 and S4 to S14 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 convergent focus deviations of light rays of different wavelengths after passing through the system. 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 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 system. As can be seen from fig. 2A to 2D, 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 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an 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 along an optical axis, 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, and a filter E8.
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 positive 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 positive 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The optical imaging system has an imaging plane S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In embodiment 2, the value of the effective focal length f of the optical imaging system is 5.40mm, and the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.87 mm.
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 | -2.6724E-03 | 5.7820E-03 | -2.0172E-02 | 3.1691E-02 | -2.6364E-02 | 1.2025E-02 | -3.0201E-03 | 3.8954E-04 | -2.0036E-05 |
| S2 | -4.7345E-04 | -9.1164E-03 | 8.4265E-03 | 1.4078E-02 | -3.0409E-02 | 2.0146E-02 | -6.0877E-03 | 8.4777E-04 | -4.2682E-05 |
| S3 | -3.0067E-03 | 1.6130E-02 | -4.7779E-02 | 8.5553E-02 | -8.7492E-02 | 4.9468E-02 | -1.5417E-02 | 2.5025E-03 | -1.6647E-04 |
| S4 | -9.3665E-03 | 2.7217E-03 | 9.7619E-03 | -2.3587E-02 | 2.1125E-02 | -9.8952E-03 | 2.5588E-03 | -3.3786E-04 | 1.6875E-05 |
| S5 | -3.8739E-02 | 1.5384E-02 | -4.2400E-03 | -2.7994E-03 | 1.3083E-03 | 2.8984E-03 | -2.7583E-03 | 8.9783E-04 | -1.0373E-04 |
| S6 | -2.1113E-02 | 1.8497E-03 | 2.6304E-02 | -4.4950E-02 | 3.8841E-02 | -1.7069E-02 | 2.9421E-03 | 2.2317E-04 | -1.0338E-04 |
| S7 | -1.4491E-02 | 2.7449E-02 | -7.5007E-02 | 1.0086E-01 | -8.6600E-02 | 4.6573E-02 | -1.5035E-02 | 2.5879E-03 | -1.7410E-04 |
| S8 | -4.3348E-02 | 3.0892E-02 | -3.2848E-03 | -4.3917E-02 | 6.1626E-02 | -4.4138E-02 | 1.8169E-02 | -4.0869E-03 | 3.9189E-04 |
| S9 | -7.7352E-02 | 5.8556E-02 | -6.3634E-02 | 6.2351E-02 | -4.6973E-02 | 2.3379E-02 | -7.2311E-03 | 1.2490E-03 | -9.0783E-05 |
| S10 | -7.2430E-02 | 3.6235E-02 | -3.1026E-02 | 2.4265E-02 | -1.3650E-02 | 4.9530E-03 | -1.0950E-03 | 1.3568E-04 | -7.2596E-06 |
| S11 | -3.5975E-03 | -2.7628E-02 | 2.8903E-02 | -2.5999E-02 | 1.4441E-02 | -4.9053E-03 | 9.8493E-04 | -1.0561E-04 | 4.6225E-06 |
| S12 | -7.0034E-02 | 5.4427E-02 | -4.2454E-02 | 2.1619E-02 | -7.3701E-03 | 1.6606E-03 | -2.3052E-04 | 1.7580E-05 | -5.6023E-07 |
| S13 | -5.7639E-02 | -4.7105E-03 | 8.5821E-03 | -2.1736E-03 | 2.7371E-04 | -1.9461E-05 | 7.5479E-07 | -1.2828E-08 | 1.8807E-11 |
| S14 | -4.6234E-02 | 1.1379E-02 | -1.7166E-03 | 1.5571E-04 | -9.4744E-06 | 4.7253E-07 | -2.2408E-08 | 8.2883E-10 | -1.4782E-11 |
TABLE 4
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 2, which represents the convergent focus deviations of light rays of different wavelengths after passing through the system. 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 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 system. As can be seen from fig. 4A to 4D, 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 6D. 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 along an optical axis, 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, and a filter E8.
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 positive 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 positive power, and has a convex 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The optical imaging system has an imaging plane S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In embodiment 3, the value of the effective focal length f of the optical imaging system is 5.42mm, and the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.81 mm.
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
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | -5.1000E-03 | -5.3325E-03 | 1.7490E-05 | 6.8385E-03 | -7.5997E-03 | 3.9168E-03 | -1.0470E-03 | 1.3833E-04 | -7.1012E-06 |
| S2 | -2.6849E-03 | -5.5754E-02 | 6.4365E-02 | -4.0152E-02 | 1.5630E-02 | -3.7504E-03 | 6.8515E-04 | -1.1966E-04 | 1.1507E-05 |
| S3 | 2.8186E-03 | -3.4776E-02 | 2.4059E-02 | 5.4144E-03 | -1.8704E-02 | 1.3236E-02 | -4.6239E-03 | 8.2039E-04 | -5.9230E-05 |
| S4 | -3.7161E-02 | 9.0409E-02 | -1.3848E-01 | 1.3319E-01 | -8.4798E-02 | 3.5701E-02 | -9.5254E-03 | 1.4550E-03 | -9.6720E-05 |
| S5 | -8.5109E-02 | 1.0161E-01 | -1.2811E-01 | 1.1823E-01 | -7.4015E-02 | 3.0901E-02 | -8.2310E-03 | 1.2572E-03 | -8.3977E-05 |
| S6 | -4.9194E-02 | 1.4320E-02 | 3.2075E-02 | -7.3267E-02 | 8.1030E-02 | -5.2173E-02 | 1.9714E-02 | -4.0150E-03 | 3.3515E-04 |
| S7 | -2.5094E-02 | 2.3978E-02 | -5.9432E-02 | 6.9633E-02 | -5.0041E-02 | 1.9166E-02 | -2.2820E-03 | -7.1124E-04 | 1.8616E-04 |
| S8 | -5.5119E-02 | 2.6286E-02 | 9.2461E-03 | -6.8999E-02 | 8.7163E-02 | -5.9192E-02 | 2.3506E-02 | -5.1080E-03 | 4.6783E-04 |
| S9 | -1.2617E-01 | 1.0238E-01 | -1.0554E-01 | 9.2880E-02 | -6.2475E-02 | 2.7286E-02 | -6.8705E-03 | 8.7511E-04 | -4.1549E-05 |
| S10 | -1.0796E-01 | 7.9153E-02 | -7.4249E-02 | 5.9516E-02 | -3.3959E-02 | 1.2501E-02 | -2.7560E-03 | 3.2873E-04 | -1.6282E-05 |
| S11 | -2.5315E-02 | 7.4687E-03 | -1.2912E-02 | 1.0437E-02 | -4.6246E-03 | 1.1946E-03 | -1.8245E-04 | 1.5508E-05 | -5.6888E-07 |
| S12 | -7.3147E-02 | 6.3236E-02 | -4.6339E-02 | 2.1878E-02 | -6.3888E-03 | 1.1561E-03 | -1.2622E-04 | 7.6132E-06 | -1.9476E-07 |
| S13 | -7.0990E-02 | 2.2240E-02 | -4.9091E-03 | 1.2885E-03 | -2.5404E-04 | 3.0398E-05 | -2.1194E-06 | 7.9987E-08 | -1.2693E-09 |
| S14 | -4.2995E-02 | 1.3783E-02 | -3.0991E-03 | 4.6247E-04 | -4.5989E-05 | 2.9619E-06 | -1.1855E-07 | 2.7687E-09 | -3.0758E-11 |
TABLE 6
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 3, which represents the convergent focus deviations of light rays of different wavelengths after passing through the system. 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 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 system. As can be seen from fig. 6A to 6D, 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 8D. 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 along an optical axis, 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, and a filter E8.
The first lens element E1 has negative power, and has a convex 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 negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The optical imaging system has an imaging plane S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In embodiment 4, the value of the effective focal length f of the optical imaging system is 5.42mm, and the value of the on-axis distance TT L from the object side face S1 of the first lens E1 to the imaging face S17 is 6.82 mm.
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 | -6.9885E-03 | -7.3474E-03 | 1.8183E-03 | 3.7826E-03 | -4.3727E-03 | 2.1127E-03 | -5.2250E-04 | 6.5071E-05 | -3.2804E-06 |
| S2 | 9.5048E-03 | -5.7954E-02 | 3.9345E-02 | -1.5561E-02 | 4.7044E-03 | -1.0513E-03 | 1.9538E-04 | -2.9624E-05 | 2.0742E-06 |
| S3 | 1.5257E-02 | -3.7305E-02 | 1.1117E-02 | 7.3161E-03 | -8.5644E-03 | 4.3647E-03 | -1.2508E-03 | 1.8846E-04 | -1.1555E-05 |
| S4 | 1.0146E-02 | -1.2147E-02 | 5.4625E-04 | 5.1527E-03 | -4.9840E-03 | 2.7842E-03 | -9.4544E-04 | 1.7440E-04 | -1.3155E-05 |
| S5 | -5.8488E-02 | 2.2898E-02 | -5.0586E-02 | 8.5957E-02 | -8.5550E-02 | 5.2097E-02 | -1.9245E-02 | 3.9524E-03 | -3.4753E-04 |
| S6 | -5.5668E-02 | 2.3599E-02 | -1.5981E-02 | 1.9319E-02 | -1.5698E-02 | 7.2926E-03 | -1.7336E-03 | 1.3987E-04 | 8.3842E-06 |
| S7 | -1.8103E-02 | 2.6254E-02 | -6.8797E-02 | 9.7946E-02 | -9.3799E-02 | 5.8579E-02 | -2.2851E-02 | 5.0328E-03 | -4.7588E-04 |
| S8 | -5.3319E-02 | 3.1257E-02 | -7.6350E-03 | -3.3500E-02 | 4.6270E-02 | -3.1107E-02 | 1.1964E-02 | -2.4982E-03 | 2.1986E-04 |
| S9 | -1.1051E-01 | 7.4636E-02 | -7.0083E-02 | 5.3470E-02 | -3.1061E-02 | 1.1221E-02 | -2.1250E-03 | 1.6191E-04 | -7.0817E-07 |
| S10 | -8.5343E-02 | 4.9714E-02 | -3.9627E-02 | 2.7876E-02 | -1.4595E-02 | 4.9055E-03 | -9.6736E-04 | 1.0233E-04 | -4.5292E-06 |
| S11 | -2.9951E-02 | 3.5325E-03 | -7.5435E-03 | 4.9451E-03 | -1.2016E-03 | -7.9944E-05 | 8.9928E-05 | -1.4691E-05 | 7.6609E-07 |
| S12 | -1.0385E-01 | 8.6061E-02 | -5.9482E-02 | 2.7308E-02 | -7.9516E-03 | 1.4757E-03 | -1.6967E-04 | 1.1001E-05 | -3.0681E-07 |
| S13 | -7.0193E-02 | 2.5404E-02 | -5.2982E-03 | 9.7310E-04 | -1.4415E-04 | 1.4593E-05 | -9.1699E-07 | 3.2203E-08 | -4.8434E-10 |
| S14 | -4.0876E-02 | 1.3050E-02 | -2.9392E-03 | 4.3919E-04 | -4.4529E-05 | 3.0086E-06 | -1.3036E-07 | 3.3797E-09 | -4.1567E-11 |
TABLE 8
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging system of example 4, which represents the convergent focus deviations of light rays of different wavelengths after passing through the system. 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 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 system. As can be seen from fig. 8A to 8D, 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 10D. 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 along an optical axis, 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, and a filter E8.
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 positive 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 positive power, and has a convex 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The optical imaging system has an imaging plane S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In embodiment 5, the value of the effective focal length f of the optical imaging system is 5.41mm, and the value of the on-axis distance TT L from the object side face S1 of the first lens E1 to the imaging face S17 is 6.81 mm.
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 | -5.1926E-03 | -4.9627E-03 | -5.7686E-04 | 7.3026E-03 | -7.8263E-03 | 3.9602E-03 | -1.0377E-03 | 1.3314E-04 | -6.5149E-06 |
| S2 | -2.2020E-03 | -5.7171E-02 | 6.6443E-02 | -4.1779E-02 | 1.6393E-02 | -3.9648E-03 | 7.3010E-04 | -1.2852E-04 | 1.2459E-05 |
| S3 | 3.6240E-03 | -3.6838E-02 | 2.6143E-02 | 6.0069E-03 | -2.1187E-02 | 1.5307E-02 | -5.4598E-03 | 9.8904E-04 | -7.2905E-05 |
| S4 | -3.2158E-02 | 7.7292E-02 | -1.2268E-01 | 1.2448E-01 | -8.4646E-02 | 3.8279E-02 | -1.0983E-02 | 1.8028E-03 | -1.2864E-04 |
| S5 | -7.9124E-02 | 8.8726E-02 | -1.1995E-01 | 1.2556E-01 | -9.2016E-02 | 4.5900E-02 | -1.4777E-02 | 2.7511E-03 | -2.2464E-04 |
| S6 | -4.6667E-02 | 1.2778E-02 | 2.4186E-02 | -5.3755E-02 | 5.8690E-02 | -3.7560E-02 | 1.4194E-02 | -2.9178E-03 | 2.5016E-04 |
| S7 | -1.9765E-02 | 1.8572E-02 | -5.2996E-02 | 6.6033E-02 | -5.2870E-02 | 2.5506E-02 | -6.7916E-03 | 7.6916E-04 | -1.8947E-06 |
| S8 | -5.9303E-02 | 3.1520E-02 | 5.8476E-03 | -6.7698E-02 | 8.6173E-02 | -5.8657E-02 | 2.3384E-02 | -5.0970E-03 | 4.6713E-04 |
| S9 | -1.2904E-01 | 1.1061E-01 | -1.2785E-01 | 1.2902E-01 | -9.7257E-02 | 4.7420E-02 | -1.3730E-02 | 2.1398E-03 | -1.3881E-04 |
| S10 | -9.8515E-02 | 6.6547E-02 | -6.2154E-02 | 5.1120E-02 | -3.0089E-02 | 1.1525E-02 | -2.6744E-03 | 3.3935E-04 | -1.8016E-05 |
| S11 | -1.9480E-02 | 1.1425E-03 | -1.0382E-02 | 1.0085E-02 | -5.6232E-03 | 1.9102E-03 | -3.8971E-04 | 4.3973E-05 | -2.0932E-06 |
| S12 | -7.6368E-02 | 6.5683E-02 | -5.1100E-02 | 2.6061E-02 | -8.7827E-03 | 1.9240E-03 | -2.5820E-04 | 1.9072E-05 | -5.9127E-07 |
| S13 | -6.6759E-02 | 1.9349E-02 | -4.7503E-03 | 1.4598E-03 | -3.0245E-04 | 3.6554E-05 | -2.5494E-06 | 9.6054E-08 | -1.5218E-09 |
| S14 | -4.0130E-02 | 1.1325E-02 | -2.2649E-03 | 3.0233E-04 | -2.6930E-05 | 1.5287E-06 | -5.2234E-08 | 1.0372E-09 | -1.1059E-11 |
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging system of example 5, which represents the convergent focus deviations of light rays of different wavelengths after passing through the system. 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 system. As can be seen from fig. 10A to 10D, 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 12D. 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 along an optical axis, 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, and a filter E8.
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 positive 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 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The optical imaging system has an imaging plane S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In embodiment 6, the value of the effective focal length f of the optical imaging system is 5.71mm, and the value of the on-axis distance TT L from the object side face S1 of the first lens E1 to the imaging face S17 is 6.90 mm.
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 example 6, which represents the convergent focus deviations of light rays of different wavelengths after passing through the system. 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 example 6, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 12A to 12D, 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 14D. 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 along an optical axis, 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, and a filter E8.
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 positive 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 positive 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The optical imaging system has an imaging plane S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In embodiment 7, the value of the effective focal length f of the optical imaging system is 5.63mm, and the value of the on-axis distance TT L from the object side face S1 of the first lens E1 to the imaging face S17 is 6.85 mm.
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.
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 1.2424E-04 | -3.4286E-03 | 1.1412E-02 | -1.9551E-02 | 1.9366E-02 | -1.1679E-02 | 4.2053E-03 | -8.3349E-04 | 6.9466E-05 |
| S4 | -7.9400E-02 | 1.1596E-01 | -8.8341E-02 | 1.2976E-02 | 4.3295E-02 | -4.6334E-02 | 2.2527E-02 | -5.5836E-03 | 5.7044E-04 |
| S5 | -9.1058E-02 | 1.2699E-01 | -9.1315E-02 | 7.7471E-03 | 5.9578E-02 | -6.5823E-02 | 3.4817E-02 | -9.5456E-03 | 1.0912E-03 |
| S6 | -2.6983E-02 | 1.9308E-02 | 4.7900E-02 | -1.4570E-01 | 2.0685E-01 | -1.8182E-01 | 1.0238E-01 | -3.4384E-02 | 5.2925E-03 |
| S7 | -3.7405E-02 | 1.0099E-02 | 1.6160E-03 | -1.0979E-01 | 2.7881E-01 | -3.5955E-01 | 2.5908E-01 | -9.9668E-02 | 1.6028E-02 |
| S8 | -4.7487E-02 | 4.3494E-03 | 2.3907E-02 | -7.2394E-02 | 8.6360E-02 | -6.2407E-02 | 2.8270E-02 | -7.4033E-03 | 8.6970E-04 |
| S9 | -8.3706E-02 | 5.4778E-03 | 3.2938E-02 | -5.6108E-02 | 4.8074E-02 | -2.8177E-02 | 1.1398E-02 | -2.6923E-03 | 2.6761E-04 |
| S10 | -7.3530E-02 | 9.7250E-03 | -3.1779E-04 | 8.4417E-03 | -1.2687E-02 | 7.8228E-03 | -2.3898E-03 | 3.5988E-04 | -2.1409E-05 |
| S11 | -1.7722E-02 | -4.1819E-03 | -1.3568E-02 | 2.0485E-02 | -1.2999E-02 | 4.6341E-03 | -9.7279E-04 | 1.1253E-04 | -5.5133E-06 |
| S12 | -7.9708E-02 | 7.2229E-02 | -5.5225E-02 | 2.8007E-02 | -8.6695E-03 | 1.6430E-03 | -1.8730E-04 | 1.1830E-05 | -3.1868E-07 |
| S13 | -5.9233E-02 | 8.5921E-03 | 2.1360E-03 | -7.1450E-04 | 8.0373E-05 | -3.6032E-06 | -3.4963E-08 | 8.8298E-09 | -2.2679E-10 |
| S14 | -4.7624E-02 | 1.5101E-02 | -3.6488E-03 | 5.9989E-04 | -6.5980E-05 | 4.6305E-06 | -1.9144E-07 | 4.0651E-09 | -3.1640E-11 |
TABLE 14
Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging system of example 7, which represents the convergent focus deviations of light rays of different wavelengths after passing through the system. 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 distortion curve of the optical imaging system of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging system of example 7, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 14A to 14D, 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.
| Conditional expression (A) example | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| f×tan(FOV/2)(mm) | 4.54 | 4.53 | 4.54 | 4.71 | 4.71 | 4.54 | 4.60 |
| f/R9 | 0.24 | 0.87 | 0.53 | 0.75 | 0.50 | 0.25 | 0.23 |
| 10×|R2-R3|/f | 0.00 | 0.33 | 0.07 | 0.08 | 0.02 | 0.00 | 0.00 |
| T12/(CT2-CT1) | 0.11 | 0.16 | 0.09 | 0.15 | 0.09 | 0.11 | 0.11 |
| |T45-T56|/|T56-T67| | 1.84 | 3.35 | 1.08 | 1.08 | 1.81 | 3.83 | 2.82 |
| |T12-ET12|×10(mm) | 0.01 | 0.30 | 0.65 | 0.88 | 0.68 | 0.01 | 0.04 |
| |CT4+CT5+CT7|/3(mm) | 0.48 | 0.47 | 0.46 | 0.46 | 0.46 | 0.48 | 0.49 |
| f/f12 | 1.18 | 1.03 | 1.07 | 1.04 | 1.06 | 1.18 | 1.17 |
| f/f3 | -0.48 | -0.39 | -0.44 | -0.42 | -0.42 | -0.46 | -0.45 |
| |f/f4|+|f/f5| | 0.17 | 0.11 | 0.28 | 0.15 | 0.21 | 0.13 | 0.01 |
| f6/CT6 | 3.22 | 3.00 | 3.64 | 4.39 | 3.76 | 3.35 | 3.45 |
| f/R1 | 2.55 | 2.19 | 2.12 | 2.12 | 2.11 | 2.55 | 2.51 |
| R5/R6 | 1.90 | 1.54 | 1.51 | 1.43 | 1.50 | 1.85 | 1.89 |
| f/(EPD×ImgH)(mm-1) | 0.39 | 0.32 | 0.33 | 0.31 | 0.32 | 0.39 | 0.38 |
| SL/TTL | 0.88 | 0.81 | 0.80 | 0.80 | 0.81 | 0.82 | 0.82 |
Watch 15
The present application also provides an imaging device provided with an electron photosensitive element to image, which 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 protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the scope of the present application. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (32)
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 focal power, an object-side surface of which is convex;
a second lens having a positive optical power;
a third lens having optical power;
a fourth lens having an optical power;
a fifth lens having optical power;
the image side surface of the sixth lens is a convex surface;
a seventh lens having a negative optical power;
the effective focal length f of the optical imaging system and the maximum field angle FOV of the optical imaging system meet f × tan (FOV/2) > 4.0 mm;
the effective focal length f of the optical imaging system and the curvature radius R9 of the object side surface of the fifth lens satisfy 0 < f/R9 < 1.0.
2. The optical imaging system of claim 1, wherein a radius of curvature R2 of an image-side surface of the first lens, a radius of curvature R3 of an object-side surface of the second lens, and an effective focal length f of the optical imaging system satisfy 10 × | R2-R3|/f < 0.5.
3. The optical imaging system of claim 1, wherein the first lens and the second lens are separated by a distance T12 on the optical axis, a center thickness CT1 of the first lens on the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy T12/(CT2-CT1) ≦ 0.2.
4. The optical imaging system of claim 3, wherein the first lens and the second lens are spaced apart by a distance T12 on the optical axis, a center thickness CT1 of the first lens on the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy 0 < T12/(CT2-CT1) ≦ 0.2.
5. The optical imaging system according to claim 1, wherein a separation distance T45 of the fourth lens and the fifth lens on the optical axis, a separation distance T56 of the fifth lens and the sixth lens on the optical axis, and a separation distance T67 of the sixth lens and the seventh lens on the optical axis satisfy 1 ≦ T45-T56|/| T56-T67| < 4.
6. The optical imaging system of claim 1, wherein the optical imaging system satisfies the conditional expression | T12-ET12| × 10 < 1.0 mm;
wherein ET12 is the edge separation distance between the first lens and the second lens; t12 is the separation distance of the first lens and the second lens on the optical axis.
7. The optical imaging system of claim 6, wherein the ET12 is a distance from another surface in a direction parallel to the optical axis at a larger one of a maximum effective radius of an image-side surface of the first lens and a maximum effective radius of an object-side surface of the second lens.
8. The optical imaging system of claim 1, wherein a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy 0.4mm ≦ (CT4+ CT5+ CT7)/3 < 0.6 mm.
9. The optical imaging system of claim 1, wherein an effective focal length f of the optical imaging system and a combined focal length f12 of the first lens and the second lens satisfy 1 ≦ f/f12 < 1.3.
10. The optical imaging system of claim 1, wherein an effective focal length f of the optical imaging system and an effective focal length f3 of the third lens satisfy-0.5 ≦ f/f3 < 0.
11. The optical imaging system of claim 1, wherein the effective focal length f of the optical imaging system, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens satisfy | f/f4| + | f/f5| ≦ 0.3.
12. The optical imaging system of claim 1, wherein an effective focal length f6 of the sixth lens and a center thickness CT6 of the sixth lens on the optical axis satisfy f6/CT6 < 5.0.
13. The optical imaging system of claim 1, wherein an effective focal length f of the optical imaging system and a radius of curvature R1 of an object-side surface of the first lens satisfy 2 < f/R1 < 3.
14. The optical imaging system of claim 1, wherein a radius of curvature R5 of an object-side surface of the third lens and a radius of curvature R6 of an image-side surface of the third lens satisfy 1 < R5/R6 < 2.
15. The optical imaging system of any one of claims 1 to 14, wherein an effective focal length f of the optical imaging system, an entrance pupil diameter EPD of the optical imaging system, and a half ImgH of a diagonal length of an effective pixel area on an imaging plane of the optical imaging system satisfy f/(EPD × ImgH) < 0.5mm-1。
16. The optical imaging system according to any one of claims 1 to 14, further comprising a stop, wherein a distance S L on the optical axis from an imaging surface of the optical imaging system to the stop and a distance TT L on the optical axis from an object side surface of the first lens to the imaging surface satisfy 0.7 < S L/TT L ≦ 0.9.
17. The optical imaging system, in order from an object side to an image side along an optical axis, comprises:
a first lens having a focal power, an object-side surface of which is convex;
a second lens having a positive optical power;
a third lens having optical power;
a fourth lens having an optical power;
a fifth lens having optical power;
the image side surface of the sixth lens is a convex surface;
a seventh lens having a negative optical power;
the effective focal length f of the optical imaging system and the maximum field angle FOV of the optical imaging system meet f × tan (FOV/2) > 4.0 mm;
an effective focal length f6 of the sixth lens and a center thickness CT6 of the sixth lens on the optical axis satisfy f6/CT6 < 5.0.
18. The optical imaging system of claim 17, wherein a radius of curvature R2 of an image-side surface of the first lens, a radius of curvature R3 of an object-side surface of the second lens, and an effective focal length f of the optical imaging system satisfy 10 × | R2-R3|/f < 0.5.
19. The optical imaging system of claim 17, wherein the first lens and the second lens are separated by a distance T12 on the optical axis, a center thickness CT1 of the first lens on the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy T12/(CT2-CT1) ≦ 0.2.
20. The optical imaging system of claim 19, wherein the first lens and the second lens are separated by a distance T12 on the optical axis, a center thickness CT1 of the first lens on the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy 0 < T12/(CT2-CT1) ≦ 0.2.
21. The optical imaging system of claim 17, wherein a separation distance T45 on the optical axis of the fourth lens and the fifth lens, a separation distance T56 on the optical axis of the fifth lens and the sixth lens, and a separation distance T67 on the optical axis of the sixth lens and the seventh lens satisfy 1 ≦ T45-T56|/| T56-T67| < 4.
22. The optical imaging system of claim 17, wherein the optical imaging system satisfies the conditional expression | T12-ET12| × 10 < 1.0 mm;
wherein ET12 is the edge separation distance between the first lens and the second lens; t12 is the separation distance of the first lens and the second lens on the optical axis.
23. The optical imaging system of claim 22, wherein the ET12 is the distance from the other surface in a direction parallel to the optical axis at the larger of the maximum effective radius of the image-side surface of the first lens and the maximum effective radius of the object-side surface of the second lens.
24. The optical imaging system of claim 17, wherein a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy 0.4mm ≦ (CT4+ CT5+ CT7)/3 < 0.6 mm.
25. The optical imaging system of claim 17, wherein an effective focal length f of the optical imaging system and a combined focal length f12 of the first and second lenses satisfy 1 ≦ f/f12 < 1.3.
26. The optical imaging system of claim 17, wherein an effective focal length f of the optical imaging system and an effective focal length f3 of the third lens satisfy-0.5 ≦ f/f3 < 0.
27. The optical imaging system of claim 17, wherein the effective focal length f of the optical imaging system, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens satisfy | f/f4| + | f/f5| ≦ 0.3.
28. The optical imaging system of claim 27, wherein an effective focal length f of the optical imaging system and a radius of curvature R9 of an object-side surface of the fifth lens satisfy 0 < f/R9 < 1.0.
29. The optical imaging system of claim 17, wherein an effective focal length f of the optical imaging system and a radius of curvature R1 of an object-side surface of the first lens satisfy 2 < f/R1 < 3.
30. The optical imaging system of claim 17, wherein a radius of curvature R5 of an object-side surface of the third lens and a radius of curvature R6 of an image-side surface of the third lens satisfy 1 < R5/R6 < 2.
31. The optical imaging system of any of claims 17 to 30, wherein the effective focal length f of the optical imaging system, the entrance pupil diameter EPD of the optical imaging system, and half ImgH of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system satisfy f/(EPD × ImgH) < 0.5mm-1。
32. The optical imaging system of any one of claims 17 to 30, further comprising a stop, wherein a distance S L on the optical axis from an imaging surface of the optical imaging system to the stop and a distance TT L on the optical axis from an object side surface of the first lens to the imaging surface satisfy 0.7 < S L/TT L ≦ 0.9.
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| CN113296233A (en) * | 2021-05-11 | 2021-08-24 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN113985574A (en) * | 2021-11-04 | 2022-01-28 | 浙江舜宇光学有限公司 | Optical imaging lens |
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| CN113296233A (en) * | 2021-05-11 | 2021-08-24 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN113296233B (en) * | 2021-05-11 | 2022-07-05 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN113985574A (en) * | 2021-11-04 | 2022-01-28 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN113985574B (en) * | 2021-11-04 | 2024-01-16 | 浙江舜宇光学有限公司 | Optical imaging lens |
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