CN109407277B - Optical imaging system - Google Patents
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- CN109407277B CN109407277B CN201811487125.6A CN201811487125A CN109407277B CN 109407277 B CN109407277 B CN 109407277B CN 201811487125 A CN201811487125 A CN 201811487125A CN 109407277 B CN109407277 B CN 109407277B
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The application discloses an optical imaging system, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative optical power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length fx of the optical imaging system in the X-axis direction meet TTL/fx < 1.
Description
Technical Field
The present application relates to an optical imaging system, and more particularly, to an optical imaging system including seven lenses.
Background
In recent years, with the rapid development of portable electronic products having a photographing function, the demand for miniaturized optical systems has been increasing. Currently, the mainstream mobile phone lens generally adopts a rotationally symmetrical (axisymmetric) aspheric surface as its planar structure. Such rotationally symmetrical aspherical surfaces can be seen as a curve in the meridian plane rotated 360 degrees around the optical axis, and thus have sufficient degrees of freedom only in the meridian plane and do not correct off-axis aberrations well.
Disclosure of Invention
The present application provides an optical imaging system applicable to portable electronic products, such as an optical imaging system applicable to a lens of a mobile phone, which at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.
In one aspect, the present application provides an optical imaging system comprising, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length fx of the optical imaging system in the X-axis direction meet TTL/fx < 1.
In one embodiment, the effective focal length fx of the optical imaging system in the X-axis direction and the effective focal length f1 of the first lens satisfy 2.0 < fx/f1 < 3.0.
In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f2 of the second lens satisfy 0.5 < f4/f2 < 2.0.
In one embodiment, the effective focal length f6 of the sixth lens and the effective focal length fy in the Y-axis direction of the optical imaging system satisfy 2.0 < f6/fy < 4.0.
In one embodiment, the effective focal length f7 of the seventh lens and the effective focal length f2 of the second lens satisfy < f7/f2 < 1.0.2.
In one embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length fy of the optical imaging system in the Y-axis direction satisfy TTL/fy < 1.0.
In one embodiment, the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy a ratio R11/R12 < 2.0.
In one embodiment, the radius of curvature R7 of the fourth lens object-side surface and the radius of curvature R13 of the seventh lens object-side surface satisfy a ratio of < R7/R13 to < 2.5.
In one embodiment, the effective focal length fx of the optical imaging system in the X-axis direction and the radius of curvature R1 of the first lens object side surface satisfy 4.0 < fx/R1 < 4.5.
In one embodiment, the radius of curvature R4 of the image side of the second lens and the effective focal length fx in the X-axis direction of the optical imaging system satisfy 0 < R4/fx < 1.5.
In one embodiment, an air space T12 on the optical axis of the first lens and the second lens, an air space T23 on the optical axis of the second lens and the third lens, an air space T34 on the optical axis of the third lens and the fourth lens, an air space T45 on the optical axis of the fourth lens and the fifth lens, and an air space T56 on the optical axis of the fifth lens and the sixth lens satisfy 1.5 (t12+t23+t34+t45)/t56 < 2.5.
In another aspect, the present application provides an optical imaging system comprising, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and the effective focal length fx of the optical imaging system in the X-axis direction and the effective focal length f1 of the first lens meet 2.0 < fx/f1 < 3.0.
In yet another aspect, the present application provides an optical imaging system comprising, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and the effective focal length f4 of the fourth lens and the effective focal length f2 of the second lens meet 0.5 < f4/f2 < 2.0.
In yet another aspect, the present application provides an optical imaging system comprising, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and an effective focal length f6 of the sixth lens and an effective focal length fy of the optical imaging system in the Y-axis direction satisfy 2.0 < f6/fy < 4.0.
In yet another aspect, the present application provides an optical imaging system comprising, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and the effective focal length f7 of the seventh lens and the effective focal length f2 of the second lens satisfy 1.0 < f7/f2 < 2.0.
In yet another aspect, the present application provides an optical imaging system comprising, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length fy of the optical imaging system in the Y-axis direction meet TTL/fy < 1.0.
In yet another aspect, the present application provides an optical imaging system comprising, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy 1.0 < R11/R12 < 2.0.
In yet another aspect, the present application provides an optical imaging system comprising, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and the radius of curvature R7 of the fourth lens object-side surface and the radius of curvature R13 of the seventh lens object-side surface satisfy 1.0 < R7/R13 < 2.5.
In yet another aspect, the present application provides an optical imaging system comprising, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and the effective focal length fx of the optical imaging system in the X-axis direction and the curvature radius R1 of the first lens object side surface meet 4.0 < fx/R1 < 4.5.
In yet another aspect, the present application provides an optical imaging system comprising, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and the curvature radius R4 of the image side surface of the second lens and the effective focal length fx of the optical imaging system in the X-axis direction meet 0 < R4/fx < 1.5.
In yet another aspect, the present application provides an optical imaging system comprising, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive optical power; the second lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical; and an air space T12 on the optical axis of the first lens and the second lens, an air space T23 on the optical axis of the second lens and the third lens, an air space T34 on the optical axis of the third lens and the fourth lens, an air space T45 on the optical axis of the fourth lens and the fifth lens, and an air space T56 on the optical axis of the fifth lens and the sixth lens satisfy 1.5 < (t12+t23+t34+t45)/t56 < 2.5.
The application adopts a plurality of (e.g. seven) lenses, and the optical imaging system has at least one beneficial effect of long focal length, good imaging quality, low sensitivity and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing between each lens and the like. In addition, the free-form surface is an non-rotationally symmetrical aspheric surface, and the application increases non-rotationally symmetrical components on the basis of the rotationally symmetrical aspheric surface, namely, the free-form surface is introduced into the lens system, thereby being beneficial to effectively correcting off-axis meridian aberration and sagittal aberration and having great promotion effect on the performance of the optical lens group.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, 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. 2 schematically illustrates the RMS spot diameter of the optical imaging system of example 1 within a first quadrant;
fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application;
FIG. 4 schematically illustrates the RMS spot diameter of the optical imaging system of example 2 within the first quadrant;
Fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application;
FIG. 6 schematically illustrates the RMS spot diameter of the optical imaging system of example 3 within the first quadrant;
Fig. 7 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application;
FIG. 8 schematically illustrates the RMS spot diameter of the optical imaging system of example 4 within the first quadrant;
Fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application;
FIG. 10 schematically illustrates the RMS spot diameter of the optical imaging system of example 5 in the first quadrant;
fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application; and
Fig. 12 schematically illustrates the RMS spot diameter of the optical imaging system of example 6 in the first quadrant.
Detailed Description
For a better understanding of the application, various aspects of the 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 application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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, then 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. In each lens, the surface closest to the subject is referred to as the subject side of the lens; in each lens, the surface closest to the imaging plane is referred to as the image side of the lens.
Herein, we define a direction parallel to the optical axis as a Z-axis direction, a direction perpendicular to the Z-axis and lying in a meridian plane as a Y-axis direction, and a direction perpendicular to the Z-axis and lying in a sagittal plane as an X-axis direction. Unless otherwise indicated, each parameter symbol (e.g., radius of curvature or optical power, etc.) herein, except for the parameter symbol related to the field of view, represents a characteristic parameter value along the Y-axis direction of the optical imaging system. For example, unless otherwise specified, the conditional expression "R1/R10" indicates a ratio of the radius of curvature R1Y in the Y-axis direction of the object side surface of the first lens to the radius of curvature R10Y in the Y-axis direction of the image side surface of the fifth lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the 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, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
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 power, 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 sequentially arranged from the object side to the image side along the optical axis, and each adjacent lens can have an air space therebetween.
In an exemplary embodiment, the first lens may have positive optical power; the second lens may have negative optical power; the third lens may have positive or negative optical power; the fourth lens may have negative optical power; the fifth lens may have positive or negative optical power; the sixth lens may have positive optical power; the seventh lens may have negative optical power.
The image quality may be further improved by setting the object side surface and/or the image side surface of at least one of the first to seventh lenses to be an aspherical surface which is non-rotationally symmetrical. The non-rotationally symmetrical aspheric surface is a free-form surface, and the non-rotationally symmetrical component is added on the basis of the rotationally symmetrical aspheric surface, so that the introduction of the non-rotationally symmetrical aspheric surface in the lens system is beneficial to effectively correcting off-axis meridian aberration and sagittal aberration, and greatly improving the performance of the optical system.
In an exemplary embodiment, the first lens may have positive optical power, and the object-side surface thereof may be convex, and the image-side surface thereof may be convex.
In an exemplary embodiment, the second lens may have negative optical power, and the object-side surface thereof may be concave, and the image-side surface thereof may be concave.
In an exemplary embodiment, the fourth lens may have negative optical power, the object-side surface thereof may be concave, and the image-side surface thereof may be concave.
In an exemplary embodiment, the sixth lens may have positive optical power, the object-side surface thereof may be concave, and the image-side surface thereof may be convex.
In an exemplary embodiment, the object side surface of the seventh lens may be concave.
In an exemplary embodiment, the optical imaging system of the present application may satisfy a conditional expression TTL/fx < 1, where TTL is an on-axis distance from an object side surface of the first lens to an imaging surface, and fx is an effective focal length in an X-axis direction of the optical imaging system. More specifically, TTL and fx can further satisfy TTL/fx.ltoreq.0.91. The focal power of the lens system and the on-axis distance TTL from the object side surface of the first lens to the imaging surface are reasonably configured, so that off-axis aberration of the optical lens group can be corrected, and imaging quality can be improved. On the basis, by introducing an aspherical surface with non-rotational symmetry, the off-axis meridian aberration and the sagittal aberration of the imaging lens are corrected, and further image quality improvement can be obtained.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 2.0 < fx/f1 < 3.0, where fx is an effective focal length of the optical imaging system in the X-axis direction and f1 is an effective focal length of the first lens. More specifically, fx and f1 may further satisfy 2.39.ltoreq.fx/f1.ltoreq.2.52. The focal power of the first lens is controlled in a reasonable range by controlling the effective focal length fx of the optical imaging system in the X-axis direction, so that the whole focal length of the imaging lens is controlled, and the effect of balancing field curvature is achieved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < f4/f2 < 2.0, where f4 is an effective focal length of the fourth lens and f2 is an effective focal length of the second lens. More specifically, f4 and f2 may further satisfy 0.90.ltoreq.f4/f2.ltoreq.1.18. By reasonably distributing the focal lengths of the second lens and the fourth lens, the spherical aberration of the system is improved, and meanwhile, the chromatic aberration of the system is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 2.0 < f6/fy < 4.0, where f6 is an effective focal length of the sixth lens and fy is an effective focal length in the Y-axis direction. More specifically, f6 and fy may further satisfy 3.25.ltoreq.f6/fy.ltoreq.3.74. By reasonably distributing the effective focal length fy of the optical imaging system in the Y-axis direction and the focal length of the sixth lens, the focal power of the rear section of the imaging system is controlled in a smaller range, so that the deflection angle of light rays can be reduced, and the sensitivity of the imaging system is reduced.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.0 < f7/f2 < 2.0, where f7 is an effective focal length of the seventh lens and f2 is an effective focal length of the second lens. More specifically, f7 and f2 may further satisfy 1.07.ltoreq.f7/f2.ltoreq.1.54. By controlling the effective focal lengths of the second lens and the seventh lens, distortion in the paraxial region of the image plane can be effectively corrected, thereby improving the imaging quality of the system.
In an exemplary embodiment, the optical imaging system of the present application may satisfy a condition of TTL/fy < 1.0, where TTL is an on-axis distance from an object side surface to an imaging surface of the first lens, and fy is an effective focal length in a Y-axis direction of the optical imaging system. More specifically, TTL and fy can further satisfy TTL/fy.ltoreq.0.90. The effective focal length fy in the Y-axis direction and the on-axis distance TTL from the object side surface of the first lens to the imaging surface are reasonably configured, so that the incidence angle of light can be reduced, the optical aberration can be reduced, and the resolution of the lens can be improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition of 1.0 < R11/R12 < 2.0, where R11 is a radius of curvature of the object-side surface of the sixth lens element and R12 is a radius of curvature of the image-side surface of the sixth lens element. More specifically, R11 and R12 may further satisfy 1.20.ltoreq.R11/R12.ltoreq.1.25. The bending direction of the sixth lens is controlled to effectively control the field curvature of the imaging system, so that the image quality of the system is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition of 1.0 < R7/R13 < 2.5, where R7 is a radius of curvature of the fourth lens object-side surface and R13 is a radius of curvature of the seventh lens object-side surface. More specifically, R7 and R13 may further satisfy 1.12.ltoreq.R7/R13.ltoreq.2.22. By controlling the radius of curvature of the fourth lens object-side surface and the radius of curvature of the seventh lens object-side surface, chromatic aberration of the imaging system can be corrected, and various phase-difference balances can be realized.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 4.0 < fx/R1 < 4.5, where fx is an effective focal length of the optical imaging system in the X-axis direction, and R1 is a radius of curvature of the object side surface of the first lens. More specifically, fx and R1 may further satisfy 4.10.ltoreq.fx/R1.ltoreq.4.22. By controlling the effective focal length fx in the X-axis direction and the curvature radius R1 of the object side surface of the first lens, the coma aberration can be reduced, and the resolution of the lens can be improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition 0 < R4/fx < 1.5, where R4 is a radius of curvature of the image side surface of the second lens and fx is an effective focal length in the X-axis direction of the optical imaging system. More specifically, R4 and fx may further satisfy 0.49.ltoreq.R4/fx.ltoreq.1.14. By meeting the relation, the reasonable distribution of the system to the focal power of the lens can be ensured, and the influence of spherical aberration and coma aberration of the system on the imaging quality is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.5 < (t12+t23+t34+t45)/t56 < 2.5, where T12 is an air space on the optical axis of the first lens and the second lens, T23 is an air space on the optical axis of the second lens and the third lens, T34 is an air space on the optical axis of the third lens and the fourth lens, T45 is an air space on the optical axis of the fourth lens and the fifth lens, and T56 is an air space on the optical axis of the fifth lens and the sixth lens. More specifically, T12, T23, T34, T45 and T56 may further satisfy 1.68.ltoreq.T12+T23+T34+T45)/T56.ltoreq.2.00. The air intervals T12, T34, T45 and T56 of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the fifth lens on the optical axis are reasonably controlled, the uniform size distribution of the lenses is facilitated, the assembly stability is ensured, the aberration of the whole optical imaging lens is reduced, and the total length of the optical imaging lens is shortened.
In an exemplary embodiment, the optical imaging system may further include a diaphragm to improve the imaging quality of the lens. Alternatively, the diaphragm may be disposed before 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 located on the imaging surface.
The optical imaging system according to the above embodiment of the present application may employ a plurality of lenses, such as seven lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the imaging quality can be improved. In addition, by introducing an aspherical surface which is not rotationally symmetrical, the off-axis meridian aberration and the sagittal aberration of the optical imaging system can be corrected, and further image quality improvement can be obtained.
In the embodiment of the present application, aspherical mirror surfaces are often used as the mirror surfaces of the respective lenses. The aspherical 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 a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving 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 may be aspherical. Alternatively, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens may be aspherical surfaces.
However, those skilled in the art will appreciate that the number of lenses making up an optical imaging system can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although six lenses are described as an example in the embodiment, the optical imaging system is not limited to including six lenses. The optical imaging system may also include other numbers of lenses, if desired.
Specific examples of the optical imaging system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical imaging system according to embodiment 1 of the present application is described below with reference to fig. 1 and 2. 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, an optical imaging system according to an exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is concave and an image-side surface S14 thereof is convex. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 1 shows the surface type, radius of curvature X, radius of curvature Y, thickness, refractive index, dispersion coefficient, cone coefficient X, and cone coefficient Y of each lens of the optical imaging system of example 1, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 1
As can be seen from table 1, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6, and the object side surface S13 of the seventh lens element E7 are aspheric. In the present embodiment, the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the aspherical i-th order. The higher order coefficients A 4、A6、A8、A10、A12、A14、A16、A18 and A 20 that can be used for each of the aspherical mirror surfaces S1-S12, S13 in example 1 are given in Table 2 below.
TABLE 2
As can be further seen from table 1, the image side surface S14 of the seventh lens E7 is an aspherical surface (i.e., AAS surface) which is not rotationally symmetrical, and the surface shape of the aspherical surface is defined by, but not limited to, the following aspherical surface formula which is not rotationally symmetrical:
Wherein z is the sagittal height of the plane parallel to the z-axis direction; CUX and CUY are curvatures of the vertices of the X, Y direction faces respectively; KX and KY are X, Y direction cone coefficients respectively; AR, BR, CR, DR, ER, FR, GR, HR, JR are 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th, 18 th, 20 th coefficients in the aspheric rotationally symmetric component, respectively; AP, BP, CP, DP, EP, FP, GP, HP, JP are the 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th, 18 th, 20 th coefficients, respectively, in the aspheric non-rotationally symmetric component.
Table 3 below gives AR, BR, CR, DR, ER, FR, GR, HR, JR coefficients of the non-rotationally symmetrical aspherical surface S14 that can be used in example 1.
TABLE 3 Table 3
Table 4 below gives the AP, BP, CP, DP, EP, FP, GP, HP, JP coefficients of the non-rotationally symmetrical aspherical surface S14 that can be used in example 1.
| AAS surface | AP | BP | CP | DP | EP | FP | GP | HP | JP |
| S14 | 4.1175E-03 | 6.1941E-04 | 7.3571E-05 | -1.2393E-05 | -6.3394E-06 | 8.5186E-06 | -5.4948E-06 | -6.3077E-05 | 0.0000E+00 |
TABLE 4 Table 4
Table 5 shows the effective focal lengths f1 to f7 of the respective lenses in embodiment 1, the effective focal length fx in the X-axis direction of the optical imaging system, the effective focal length fy in the Y-axis direction of the optical imaging system, the total optical length TTL of the optical imaging system (i.e., the distance on the optical axis from the object side surface S1 to the imaging surface S17 of the first lens E1), half of the diagonal length ImgH of the effective pixel area on the imaging surface S17, the maximum half field angle Semi-FOV, and the f-number Fno of the optical imaging system.
| f1(mm) | 2.84 | fx(mm) | 7.17 |
| f2(mm) | -5.32 | fy(mm) | 7.19 |
| f3(mm) | 14.84 | TTL(mm) | 6.32 |
| f4(mm) | -6.29 | ImgH(mm) | 3.10 |
| f5(mm) | -31.24 | Semi-FOV(°) | 23.4 |
| f6(mm) | 26.04 | Fno | 2.65 |
| f7(mm) | -8.17 |
TABLE 5
The optical imaging system in embodiment 1 satisfies:
TTL/fx=0.88, where TTL is the on-axis distance from the object side surface to the imaging surface of the first lens, and fx is the effective focal length in the X-axis direction of the optical imaging system;
fx/f1=2.52, where fx is the effective focal length in the X-axis direction and f1 is the effective focal length of the first lens;
f4/f2=1.18, where f4 is the effective focal length of the fourth lens and f2 is the effective focal length of the second lens;
f6/fy=3.62, where f6 is the effective focal length of the sixth lens and fy is the effective focal length in the Y-axis direction of the optical imaging system;
f7/f2=1.54, where f7 is the effective focal length of the seventh lens and f2 is the effective focal length of the second lens;
TTL/fy=0.88, where TTL is the on-axis distance from the object side surface to the imaging surface of the first lens, and fy is the effective focal length in the Y-axis direction of the optical imaging system;
R11/r12=1.22, where R11 is the radius of curvature of the object-side surface of the sixth lens element and R12 is the radius of curvature of the image-side surface of the sixth lens element;
R7/r13=1.63, where R7 is the radius of curvature of the fourth lens object-side surface and R13 is the radius of curvature of the seventh lens object-side surface;
fx/r1=4.22, where fx is the effective focal length in the X-axis direction, and R1 is the radius of curvature of the object-side surface of the first lens element;
R4/fx=0.84, where R4 is the radius of curvature of the image-side surface of the second lens element, and fx is the effective focal length in the X-axis direction;
(t12+t23+t34+t45)/t56=1.68, wherein T12 is an air space on the optical axis of the first lens and the second lens, T23 is an air space on the optical axis of the second lens and the third lens, T34 is an air space on the optical axis of the third lens and the fourth lens, T45 is an air space on the optical axis of the fourth lens and the fifth lens, and T56 is an air space on the optical axis of the fifth lens and the sixth lens.
Fig. 2 shows the RMS spot diameter of the optical imaging system of example 1 at different image height positions within the first quadrant. As can be seen from fig. 2, the optical imaging system provided in embodiment 1 has the characteristics of long focal length, good imaging quality and low sensitivity.
Example 2
An optical imaging system according to embodiment 2 of the present application is described below with reference to fig. 3 and 4. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application.
As shown in fig. 3, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is concave and an image-side surface S14 thereof is convex. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 6 shows the surface type, radius of curvature X, radius of curvature Y, thickness, refractive index, dispersion coefficient, cone coefficient X, and cone coefficient Y of each lens of the optical imaging system of example 2, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 6
As can be seen from table 6, in example 2, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6, and the image side surface S14 of the seventh lens element E7 are aspheric; the object side surface S13 of the seventh lens E7 is an aspherical surface with non-rotational symmetry.
Table 7 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Tables 8 and 9 show the rotational symmetry component of the non-rotationally symmetrical aspherical surface S13 and the higher-order coefficients of the non-rotationally symmetrical components that can be used in embodiment 2, wherein the non-rotationally symmetrical aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
TABLE 7
TABLE 8
TABLE 9
Table 10 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 2, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, a half of the diagonal length ImgH of the effective pixel area on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno of the optical imaging system.
| f1(mm) | 3.00 | fx(mm) | 7.18 |
| f2(mm) | -5.22 | fy(mm) | 7.20 |
| f3(mm) | 11.88 | TTL(mm) | 6.33 |
| f4(mm) | -6.15 | ImgH(mm) | 3.10 |
| f5(mm) | 688.25 | Semi-FOV(°) | 23.3 |
| f6(mm) | 25.75 | Fno | 2.65 |
| f7(mm) | -7.06 |
Table 10
Fig. 4 shows the RMS spot diameter of the optical imaging system of example 2 at different image height positions within the first quadrant. As can be seen from fig. 4, the optical imaging system provided in embodiment 2 has the characteristics of long focal length, good imaging quality and low sensitivity.
Example 3
An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 5 and 6. Fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application.
As shown in fig. 5, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is concave and an image-side surface S14 thereof is convex. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 11 shows the surface type, radius of curvature X, radius of curvature Y, thickness, refractive index, dispersion coefficient, cone coefficient X, and cone coefficient Y of each lens of the optical imaging system of example 3, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 11
As can be seen from table 11, in example 3, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the seventh lens element E7, and the object side surface S11 of the sixth lens element E6 are aspheric; the image side surface S12 of the sixth lens E6 is an aspherical surface which is non-rotationally symmetrical.
Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Tables 13 and 14 show the rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S12 in embodiment 3, in which the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 3.6632E-02 | -1.8385E-03 | -1.9460E-03 | -6.3518E-04 | -1.5859E-04 | -1.5167E-05 | 9.4692E-06 | 5.2528E-06 | -5.5643E-07 |
| S2 | 5.0736E-03 | 7.8666E-04 | -1.2892E-03 | 3.5093E-04 | -1.1403E-04 | 7.0827E-05 | -1.9915E-05 | 9.5920E-06 | -6.0152E-06 |
| S3 | 6.7395E-02 | 8.8295E-03 | -1.9169E-04 | 7.9708E-04 | -1.0662E-04 | 9.5782E-05 | -3.7837E-05 | 8.3556E-06 | -6.0852E-06 |
| S4 | 3.8074E-02 | 6.8104E-03 | 1.2176E-03 | 7.5825E-04 | 1.5564E-04 | 1.2450E-04 | 2.2340E-05 | 1.3206E-05 | -6.1156E-07 |
| S5 | -1.0774E-01 | -1.4672E-02 | 1.9966E-03 | 1.2825E-04 | -1.4326E-04 | 4.9193E-05 | -5.1347E-06 | -1.5600E-05 | -4.5002E-06 |
| S6 | -1.5695E-02 | -1.3342E-02 | 9.1059E-04 | -2.1127E-05 | -2.7472E-05 | 8.9932E-05 | -3.0452E-05 | -1.1867E-05 | 1.3211E-06 |
| S7 | 2.0234E-01 | 5.5366E-03 | -4.3920E-03 | 1.4022E-04 | -8.5300E-05 | 7.3028E-05 | -3.6644E-05 | 3.8373E-06 | -8.7566E-07 |
| S8 | 9.9406E-02 | 1.6913E-02 | -3.4688E-03 | -8.3355E-06 | -2.3159E-04 | 5.1526E-05 | -1.0170E-05 | 6.2593E-06 | -2.9272E-06 |
| S9 | -1.6032E-01 | -5.7542E-03 | -5.0999E-03 | -7.9367E-04 | -3.5967E-04 | -1.7170E-04 | -5.1212E-05 | -2.2975E-05 | -4.5804E-06 |
| S10 | -1.4061E-01 | -1.5387E-02 | -7.9983E-03 | -2.1468E-04 | -4.5008E-04 | -1.7727E-04 | 2.9550E-06 | -1.2622E-05 | 8.5439E-07 |
| S11 | 1.3237E-01 | 9.3748E-03 | -1.2629E-02 | 1.2443E-02 | 5.9960E-03 | -1.0305E-03 | 1.5196E-04 | -1.8704E-04 | -1.0041E-04 |
| S13 | -5.7638E-02 | 1.2759E-01 | -4.5083E-02 | -8.2141E-03 | 1.1669E-04 | -1.0731E-03 | 2.5072E-03 | -1.8907E-03 | 7.7543E-04 |
| S14 | -4.9038E-01 | 9.5431E-02 | -5.2433E-02 | 1.0621E-02 | -2.1562E-02 | 6.9466E-03 | -2.4994E-03 | 1.3511E-04 | 7.9192E-05 |
Table 12
TABLE 13
TABLE 14
Table 15 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 3, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno of the optical imaging system.
| f1(mm) | 3.00 | fx(mm) | 7.19 |
| f2(mm) | -4.81 | fy(mm) | 7.20 |
| f3(mm) | 7.28 | TTL(mm) | 6.33 |
| f4(mm) | -5.05 | ImgH(mm) | 3.08 |
| f5(mm) | 280.89 | Semi-FOV(°) | 23.2 |
| f6(mm) | 23.43 | Fno | 2.65 |
| f7(mm) | -7.03 |
TABLE 15
Fig. 6 shows the RMS spot diameter of the optical imaging system of example 3 at different image height positions within the first quadrant. As can be seen from fig. 6, the optical imaging system provided in embodiment 3 has the characteristics of long focal length, good imaging quality, and low sensitivity.
Example 4
An optical imaging system according to embodiment 4 of the present application is described below with reference to fig. 7 and 8. Fig. 7 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is concave and an image-side surface S14 thereof is convex. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 16 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the optical imaging system of example 4, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 16
As can be seen from table 16, in example 4, the object side surface and the image side surface of any one of the first lens element E1, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6, the object side surface S3 of the second lens element E2 and the object side surface S13 of the seventh lens element E7 are aspheric; the image side surface S4 of the second lens element E2 and the image side surface S14 of the seventh lens element E7 are aspheric with respect to non-rotational symmetry.
Table 17 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Tables 18 to 21 show rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S4 and S14 in embodiment 4, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 3.7940E-02 | -1.2176E-03 | -1.9646E-03 | -7.0219E-04 | -1.6248E-04 | -1.8083E-05 | 7.7262E-06 | 1.4944E-06 | 8.4461E-07 |
| S2 | -4.9782E-03 | 1.1253E-03 | -5.7287E-04 | 1.6218E-04 | 2.0265E-05 | 1.7974E-05 | 8.4518E-08 | -3.9902E-07 | -2.5099E-07 |
| S3 | 5.5349E-02 | 7.6840E-03 | 1.3550E-03 | 2.8911E-04 | 7.1633E-05 | 2.8790E-05 | 8.5761E-07 | -1.3084E-06 | 1.7764E-06 |
| S5 | -7.4490E-02 | -9.8824E-03 | 1.2065E-03 | 2.5338E-05 | -1.1083E-04 | 1.5018E-07 | 7.4707E-06 | -6.9295E-06 | 2.0194E-06 |
| S6 | 2.8792E-03 | -7.5756E-03 | -1.4522E-03 | 7.1270E-04 | -9.0398E-05 | -4.8050E-06 | 6.1730E-06 | -3.3783E-06 | -2.1769E-06 |
| S7 | 1.4660E-01 | 4.1610E-03 | -4.9893E-03 | 9.7243E-04 | -1.7579E-04 | 1.0613E-05 | -3.7755E-06 | 2.2876E-06 | -1.0431E-06 |
| S8 | 8.8099E-02 | 1.1852E-02 | -2.6026E-03 | 4.3269E-04 | -2.5240E-04 | 4.3463E-05 | -6.0462E-06 | 2.9041E-06 | -1.6996E-06 |
| S9 | -1.1775E-01 | -1.2643E-02 | -4.4590E-03 | -1.5828E-04 | -1.7165E-04 | -8.6057E-05 | -1.3039E-05 | -1.1452E-05 | -1.3003E-06 |
| S10 | -9.8906E-02 | -2.1307E-02 | -7.8678E-03 | 6.6936E-04 | -8.9819E-04 | -2.2653E-04 | 5.3085E-06 | -3.9148E-05 | -1.2542E-06 |
| S11 | 2.9532E-01 | 1.2303E-02 | -1.9742E-02 | 1.2967E-02 | 6.0588E-03 | 3.6823E-04 | 1.3453E-03 | -3.2553E-04 | -2.0944E-05 |
| S12 | 1.1877E-01 | 5.5438E-02 | -3.4839E-03 | -8.6440E-03 | 1.8391E-02 | -2.8554E-03 | 4.1638E-03 | -2.7198E-05 | 1.6755E-04 |
| S13 | -1.5661E-01 | 1.3383E-01 | -3.3693E-02 | -1.9002E-02 | 6.2586E-03 | -3.7742E-03 | 3.1254E-03 | -1.5291E-03 | 5.9152E-04 |
TABLE 17
TABLE 18
TABLE 19
Table 20
Table 21
Table 22 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 4, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno of the optical imaging system.
| f1(mm) | 2.90 | fx(mm) | 7.15 |
| f2(mm) | -6.87 | fy(mm) | 7.18 |
| f3(mm) | -35459.41 | TTL(mm) | 6.35 |
| f4(mm) | -6.16 | ImgH(mm) | 3.10 |
| f5(mm) | 54.55 | Semi-FOV(°) | 23.3 |
| f6(mm) | 24.95 | Fno | 2.62 |
| f7(mm) | -7.33 |
Table 22
Fig. 8 shows the RMS spot diameter of the optical imaging system of example 4 at different image height positions within the first quadrant. As can be seen from fig. 8, the optical imaging system provided in embodiment 4 has the characteristics of long focal length, good imaging quality, and low sensitivity.
Example 5
An optical imaging system according to embodiment 5 of the present application is described below with reference to fig. 9 and 10. Fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 23 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the optical imaging system of example 5, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 23
As can be seen from table 23, in example 5, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6, and the object side surface S13 of the seventh lens element E7 are aspheric; the image side surface S14 of the seventh lens E7 is an aspherical surface that is non-rotationally symmetrical.
Table 24 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Tables 25 and 26 show rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S14 in embodiment 5, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Table 24
| AAS surface | AR | BR | CR | DR | ER | FR | GR | HR |
| S14 | -1.3036E-01 | 1.2161E-01 | -7.0533E-02 | 2.4047E-02 | -5.0319E-03 | 6.4073E-04 | -4.5570E-05 | 1.3826E-06 |
Table 25
| AAS surface | AP | BP | CP | DP | EP | FP | GP | HP |
| S14 | -2.9109E-04 | 3.5608E-06 | 2.0668E-05 | 2.8542E-06 | -1.8728E-06 | 1.7422E-06 | 4.1494E-06 | 0.0000E+00 |
Table 26
Table 27 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 5, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno of the optical imaging system.
| f1(mm) | 2.89 | fx(mm) | 6.99 |
| f2(mm) | -5.17 | fy(mm) | 7.07 |
| f3(mm) | 11.21 | TTL(mm) | 6.33 |
| f4(mm) | -5.56 | ImgH(mm) | 3.27 |
| f5(mm) | 81.09 | Semi-FOV(°) | 24.9 |
| f6(mm) | 26.43 | Fno | 2.67 |
| f7(mm) | -6.51 |
Table 27
Fig. 10 shows the RMS spot diameter of the optical imaging system of example 5 at different image height positions within the first quadrant. As can be seen from fig. 10, the optical imaging system provided in embodiment 5 has the characteristics of long focal length, good imaging quality, and low sensitivity.
Example 6
An optical imaging system according to embodiment 6 of the present application is described below with reference to fig. 11 and 12. 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 according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 28 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the optical imaging system of example 6, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 28
As can be seen from table 28, in example 6, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6 and the object side surface S13 of the seventh lens element E7 are aspheric; the image side surface S14 of the seventh lens E7 is an aspherical surface that is non-rotationally symmetrical.
Table 29 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Tables 30 and 31 show rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S14 in embodiment 6, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 |
| S1 | 3.5653E-02 | 4.0253E-04 | -7.3438E-04 | -1.8298E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | 4.3398E-03 | 3.5701E-03 | -1.1541E-04 | 7.7144E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | 4.6141E-02 | 7.6462E-03 | 6.3554E-04 | -7.8457E-05 | 1.6706E-05 | -5.9066E-06 | -2.3385E-06 | -1.2024E-06 |
| S4 | 1.7199E-02 | -3.3567E-04 | 4.5537E-04 | -2.6972E-04 | -6.5014E-05 | -1.5184E-05 | -4.7028E-06 | -1.2280E-06 |
| S5 | -7.8191E-02 | -1.0949E-02 | 1.2034E-03 | -1.1552E-05 | -1.6410E-04 | -1.1879E-05 | 0.0000E+00 | 0.0000E+00 |
| S6 | 1.2357E-02 | -5.9812E-03 | -2.2725E-03 | 5.9969E-04 | -5.0015E-05 | -2.5904E-05 | 0.0000E+00 | 0.0000E+00 |
| S7 | 1.3759E-01 | 6.6199E-03 | -4.8728E-03 | 7.8941E-04 | -2.1200E-05 | -2.4274E-05 | 0.0000E+00 | 0.0000E+00 |
| S8 | 6.8383E-02 | 8.7053E-03 | -1.8827E-03 | 1.9337E-04 | -2.0606E-04 | 2.2775E-05 | 0.0000E+00 | 0.0000E+00 |
| S9 | -1.8792E-01 | -1.9181E-02 | -3.4857E-03 | -2.2573E-04 | -5.2858E-05 | -2.5360E-05 | 0.0000E+00 | 0.0000E+00 |
| S10 | -2.3156E-01 | -1.9308E-02 | -1.1146E-03 | 4.5460E-05 | -4.0325E-04 | -1.4656E-04 | -2.6552E-05 | -1.2416E-05 |
| S11 | 7.7933E-02 | 3.4350E-02 | 1.0025E-02 | 1.8591E-02 | 4.5134E-03 | -1.5506E-03 | 3.4970E-04 | -7.3548E-05 |
| S12 | 3.6599E-02 | 8.8960E-02 | 2.3118E-02 | 3.9816E-03 | 1.6653E-02 | -8.6957E-04 | 1.1682E-03 | 7.2828E-04 |
| S13 | -4.4722E-01 | 1.7548E-01 | -1.3511E-02 | -2.0817E-02 | 2.2398E-03 | 4.5643E-03 | -2.5469E-03 | 7.3092E-04 |
Table 29
Table 30
| AAS surface | AP | BP | CP | DP | EP | FP | GP | HP |
| S14 | -2.9109E-04 | 3.5608E-06 | 2.0668E-05 | 2.8542E-06 | -1.8728E-06 | 1.7422E-06 | 4.1494E-06 | 0.0000E+00 |
Table 31
Table 32 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 6, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno of the optical imaging system.
| f1(mm) | 2.87 | fx(mm) | 7.01 |
| f2(mm) | -5.21 | fy(mm) | 7.07 |
| f3(mm) | 11.84 | TTL(mm) | 6.33 |
| f4(mm) | -5.91 | ImgH(mm) | 3.27 |
| f5(mm) | -301.89 | Semi-FOV(°) | 24.9 |
| f6(mm) | 25.92 | Fno | 2.67 |
| f7(mm) | -6.57 |
Table 32
Fig. 12 shows the RMS spot diameter of the optical imaging system of example 6 at different image height positions within the first quadrant. As can be seen from fig. 12, the optical imaging system provided in embodiment 6 has the characteristics of long focal length, good imaging quality, and low sensitivity.
In summary, examples 1 to 6 satisfy the relationships shown in table 33, respectively.
| Condition/example | 1 | 2 | 3 | 4 | 5 | 6 |
| TTL/fx | 0.88 | 0.88 | 0.88 | 0.89 | 0.91 | 0.90 |
| fx/f1 | 2.52 | 2.39 | 2.40 | 2.47 | 2.42 | 2.44 |
| f4/f2 | 1.18 | 1.18 | 1.05 | 0.90 | 1.08 | 1.13 |
| f6/fy | 3.62 | 3.58 | 3.25 | 3.48 | 3.74 | 3.67 |
| f7/f2 | 1.54 | 1.35 | 1.46 | 1.07 | 1.26 | 1.26 |
| TTL/fy | 0.88 | 0.88 | 0.88 | 0.88 | 0.90 | 0.90 |
| R11/R12 | 1.22 | 1.22 | 1.25 | 1.22 | 1.20 | 1.21 |
| R7/R13 | 1.63 | 1.90 | 1.91 | 2.22 | 1.22 | 1.12 |
| fx/R1 | 4.22 | 4.20 | 4.22 | 4.17 | 4.10 | 4.12 |
| R4/fx | 0.84 | 0.63 | 0.49 | 1.14 | 0.71 | 0.73 |
| (T12+T23+T34+T45)/T56 | 1.68 | 1.93 | 2.00 | 1.75 | 1.76 | 1.73 |
Table 33
The application also provides an image pickup device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand-alone imaging apparatus such as a digital camera, or may be an imaging module integrated on a mobile electronic apparatus such as a cellular phone. The image pickup apparatus is equipped with the optical imaging system described above.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (9)
1. The optical imaging system sequentially comprises, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens,
It is characterized in that the method comprises the steps of,
The first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface;
the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface;
the fourth lens has negative focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface;
the sixth lens element with positive refractive power has a concave object-side surface and a convex image-side surface;
the seventh lens has negative focal power, and the object side surface of the seventh lens is a concave surface;
at most one of the third lens and the fifth lens has negative optical power;
the number of lenses of the optical imaging system having optical power is seven;
at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical;
The on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length fx of the optical imaging system in the X-axis direction are equal to or less than 0.88 and equal to TTL/fx < 1, wherein the X-axis direction is a direction perpendicular to the optical axis and positioned in a sagittal plane;
An air interval T12 on the optical axis of the first lens and the second lens, an air interval T23 on the optical axis of the second lens and the third lens, an air interval T34 on the optical axis of the third lens and the fourth lens, an air interval T45 on the optical axis of the fourth lens and the fifth lens, and an air interval T56 on the optical axis of the fifth lens and the sixth lens satisfy 1.5 < 1.5 > (t12+t23+t34+t45)/t56 < 2.5;
And the curvature radius R7Y of the fourth lens object side surface in the Y-axis direction and the curvature radius R13Y of the seventh lens object side surface in the Y-axis direction meet 1.12-2.22, wherein the Y-axis direction is a direction perpendicular to the optical axis and positioned in a meridian plane.
2. The optical imaging system according to claim 1, wherein an effective focal length fx of the optical imaging system in the X-axis direction and an effective focal length f1 of the first lens satisfy 2.0 < fx/f1 < 3.0.
3. The optical imaging system of claim 1, wherein an effective focal length f4 of the fourth lens and an effective focal length f2 of the second lens satisfy 0.5 < f4/f2 < 2.0.
4. The optical imaging system of claim 1, wherein an effective focal length f6 of the sixth lens and an effective focal length fy of the optical imaging system in a Y-axis direction satisfy 2.0 < f6/fy < 4.0.
5. The optical imaging system of claim 1, wherein an effective focal length f7 of the seventh lens and an effective focal length f2 of the second lens satisfy 1.0 < f7/f2 < 2.0.
6. The optical imaging system of claim 1, wherein an on-axis distance TTL from the object side surface to the imaging surface of the first lens element and an effective focal length fy in a Y-axis direction of the optical imaging system satisfy 0.88 ∈ttl/fy < 1.0.
7. The optical imaging system according to claim 1, wherein a radius of curvature R11Y in the Y-axis direction of the sixth lens object-side surface and a radius of curvature R12Y in the Y-axis direction of the sixth lens image-side surface satisfy 1.0 < R11Y/R12Y < 2.0.
8. The optical imaging system according to claim 1, wherein an effective focal length fx in an X-axis direction of the optical imaging system and a radius of curvature R1Y in a Y-axis direction of the first lens object side surface satisfy 4.0 < fx/R1Y < 4.5.
9. The optical imaging system according to claim 1, wherein a radius of curvature R4Y in the Y-axis direction of the second lens image side and an effective focal length fx in the X-axis direction of the optical imaging system satisfy 0 < R4Y/fx < 1.5.
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| CN115657268A (en) * | 2019-08-09 | 2023-01-31 | 华为技术有限公司 | Camera module and terminal equipment |
| WO2021134263A1 (en) * | 2019-12-30 | 2021-07-08 | 诚瑞光学(常州)股份有限公司 | Imaging optical lens |
| JP6919028B1 (en) * | 2020-06-23 | 2021-08-11 | エーエーシー オプティックス ソリューションズ ピーティーイー リミテッド | Imaging lens |
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