CN110579863B - Optical imaging system - Google Patents

Optical imaging system Download PDF

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Publication number
CN110579863B
CN110579863B CN201910968355.2A CN201910968355A CN110579863B CN 110579863 B CN110579863 B CN 110579863B CN 201910968355 A CN201910968355 A CN 201910968355A CN 110579863 B CN110579863 B CN 110579863B
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lens
imaging system
optical
optical imaging
image
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CN110579863A (en
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李洋
贺凌波
赵烈烽
戴付建
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

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: the first lens with negative focal power has a concave object side surface and a convex image side surface; a second lens having negative optical power; a third lens having optical power; a fourth lens having negative optical power; a fifth lens having optical power; a sixth lens having optical power; at least one of the object side surface of the first lens to the image side surface of the sixth lens is an aspheric surface which is non-rotationally symmetrical.

Description

Optical imaging system
Technical Field
The present application relates to the field of optical elements, and more particularly to an optical imaging system.
Background
In recent years, with the development of science and technology, the market demand for an optical imaging system suitable for portable electronic products has increased. Such as cell phones, and its imaging quality has become an important factor in evaluating the performance of smart phones.
The ever-increasing requirements of people on the imaging quality of electronic products make the optical imaging system be continuously updated, and the design difficulty of the optical imaging system for the portable electronic products is higher. For example, the optical distortion and TV distortion of the wide-angle optical system are large, and the resulting image distortion is serious. These distortions of the wide angle optical system are generally difficult to correct, and correction of off-axis and sagittal aberrations is also difficult.
An optical imaging system that can achieve a large angle of view, low distortion, and low aberration is therefore desired.
Disclosure of Invention
The application provides an optical imaging system, which sequentially comprises from an object side to an image side along an optical axis: the object side surface of the first lens with negative focal power can be concave, and the image side surface of the first lens can be convex; a second lens having negative optical power; a third lens having optical power; a fourth lens having negative optical power; a fifth lens having optical power; a sixth lens having optical power; at least one of the object-side surface of the first lens element to the image-side surface of the sixth lens element may be an aspheric surface that is rotationally asymmetric.
In one embodiment, the object-side surface of the sixth lens element and the image-side surface of the sixth lens element may each be rotationally asymmetric aspheric, and the X-axis-direction radius of curvature R11X of the object-side surface of the sixth lens element and the X-axis-direction radius of curvature R12X of the image-side surface of the sixth lens element may satisfy 0.5 < R11X/R12X < 1.5.
In one embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens may satisfy-6.0 < f1/f3 < -3.0.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy 1.5+.r2/r1+.3.0.
In one embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy 1.0 < R3/R4 < 1.5.
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-3.5 < R5/R6 < -1.0.
In one embodiment, the radius of curvature R10 of the image side of the fifth lens element, the radius of curvature R11 of the object side of the sixth lens element and the radius of curvature R12 of the image side of the sixth lens element may satisfy-2.0 < R10/(R11+R12) < -0.5.
In one embodiment, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis may satisfy 1.5 < CT 5/(CT 1-CT 2) < 3.0.
In one embodiment, the center thickness CT3 of the third lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis may satisfy 1.0 < (CT5+CT6)/CT 3 < 2.0.
In one embodiment, the separation distance T12 of the first lens and the second lens on the optical axis, the separation distance T23 of the second lens and the third lens on the optical axis, the separation distance T34 of the third lens and the fourth lens on the optical axis, and the separation distance T45 of the fourth lens and the fifth lens on the optical axis may satisfy 2.1 < (t23+t34)/(t12+t45) < 3.7.
In one embodiment, half of the maximum field angle of the optical imaging system, semi-FOV, may satisfy Semi-FOV > 50 °.
The application adopts six lenses, and the optical imaging system has at least one beneficial effect of large visual angle, low distortion or low aberration by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing between each lens 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, 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.
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. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens 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, 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, fx represents a radius of curvature in the X-axis direction of the optical imaging system, and fy represents a radius of curvature in the Y-axis direction of the optical imaging system.
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, six lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six lenses are sequentially arranged from the object side to the image side along the optical axis. In the first lens to the sixth lens, any adjacent two lenses may have an air space therebetween.
In an exemplary embodiment, the first lens may have negative optical power, and the object-side surface thereof may be concave and the image-side surface thereof may be convex. By matching the optical power and the surface shape of the first lens, it is advantageous for the first lens to have good workability.
In an exemplary embodiment, the second lens may have negative optical power. The second lens with negative focal power is beneficial to correcting off-axis aberration of the optical imaging system and improving imaging quality.
In an exemplary embodiment, 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 or negative optical power. By reasonably controlling the positive and negative distribution of the optical power of each component of the system and the surface curvature of the lens, the low-order aberration of the control system can be effectively balanced, the sensitivity of the optical imaging system to tolerance can be reduced, and the resolution can be improved. Wherein the negative power fourth lens is beneficial for reducing tolerance sensitivity of the optical imaging system.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror. 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, and the sixth lens is an aspherical mirror surface. Optionally, 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 are aspherical mirror surfaces.
In an exemplary embodiment, an object side surface or an image side surface of at least one of the first lens to the sixth lens is an aspherical surface which is non-rotationally symmetrical. The non-rotationally symmetrical aspheric surface is formed by adding non-rotationally symmetrical components on the basis of the rotationally symmetrical aspheric surface, and the non-rotationally symmetrical aspheric surface mirror surface is beneficial to reducing optical distortion and TV distortion, correcting off-axis meridian aberration and sagittal aberration of the optical imaging system and improving imaging quality of the optical imaging system. Optionally, the object side surface and the image side surface of the sixth lens are aspheric with non-rotational symmetry.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < R11X/R12X < 1.5, where R11X is a radius of curvature of the object side surface of the sixth lens element in the X-axis direction, and R12X is a radius of curvature of the image side surface of the sixth lens element in the X-axis direction. More specifically, R11x and R12x may satisfy 0.93 < R11x/R12x < 1.45. The curvature of the sixth lens can be controlled by controlling the ratio of the curvature radiuses of the two mirrors of the sixth lens in the X-axis direction, so that the off-axis arc-vector aberration of the optical imaging system 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-6.0 < f1/f3 < -3.0, where f1 is an effective focal length of the first lens and f3 is an effective focal length of the third lens. More specifically, f1 and f3 may satisfy-5.8 < f1/f3 < -3.4. The ratio of the effective focal length of the first lens to the effective focal length of the third lens is controlled, so that the focal power of the first lens is matched with the focal power of the third lens, the first lens and the third lens have good processing-facilitating forms, large view fields of an object space are shared, off-axis aberration generated by the lens in the image side direction of the third lens is corrected, and imaging quality of an optical imaging system is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition that R2/r1+.3.0, where R1 is a radius of curvature of an object side surface of the first lens and R2 is a radius of curvature of an image side surface of the first lens. By controlling the ratio of the radii of curvature of the object-side and image-side surfaces of the first lens, it is advantageous to balance the advanced spherical aberration of the optical imaging system and reduce the sensitivity of the optical imaging system.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.0 < R3/R4 < 1.5, where R3 is a radius of curvature of an object side surface of the second lens and R4 is a radius of curvature of an image side surface of the second lens. More specifically, R3 and R4 may satisfy 1.1 < R3/R4 < 1.4. The ratio of the curvature radius of the object side surface of the second lens to the curvature radius of the image side surface of the second lens is controlled, so that the curvature radii of the two side surfaces of the second lens are matched, off-axis aberration of the optical imaging system is corrected, and imaging quality is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression-3.5 < R5/R6 < -1.0, 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-3.35 < R5/R6 < -1.25. By controlling the ratio of the curvature radius of the object side surface of the third lens to the curvature radius of the image side surface of the third lens, the distortion of the optical imaging system is favorably controlled, and the optical imaging system has better imaging quality.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition-2.0 < R10/(r11+r12) < -0.5, where R10 is a radius of curvature of the image side of the fifth lens, R11 is a radius of curvature of the object side of the sixth lens, and R12 is a radius of curvature of the image side of the sixth lens. More specifically, R10, R11 and R12 may satisfy-1.99 < R10/(R11+R12) < -0.60. By matching the radius of curvature of the image side surface of the fifth lens, the radius of curvature of the object side surface of the sixth lens, and the radius of curvature of the image side surface of the sixth lens, chromatic aberration of the optical imaging system is favorably corrected, and balance between aberrations can be made.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.5 < CT 5/(CT 1-CT 2) < 3.0, where CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis. More specifically, CT1, CT2, and CT5 may satisfy 1.6 < CT 5/(CT 1-CT 2) < 2.7. The center thicknesses of the first lens, the second lens and the fifth lens are matched, so that the ratio of the first lens to the second lens occupied in the internal space of the optical imaging system can be controlled, manufacturability of the lenses during assembly can be guaranteed, and the optical imaging system has the characteristic of miniaturization.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition of 1.0 < (ct5+ct6)/CT 3 < 2.0, where CT3 is a center thickness of the third lens on the optical axis, CT5 is a center thickness of the fifth lens on the optical axis, and CT6 is a center thickness of the sixth lens on the optical axis. More specifically, CT3, CT5, and CT6 may satisfy 1.4 < (CT5+CT6)/CT 3 < 1.9. The center thicknesses of the third lens, the fifth lens and the sixth lens are controlled to be matched, so that the thicknesses of the lenses are matched uniformly, manufacturability of the lenses in assembly is guaranteed, aberration of the optical imaging system is reduced, and the total optical length of the optical imaging system can be shortened.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 2.1 < (t23+t34)/(t12+t45) < 3.7, where T12 is the distance between the first lens and the second lens on the optical axis, T23 is the distance between the second lens and the third lens on the optical axis, T34 is the distance between the third lens and the fourth lens on the optical axis, and T45 is the distance between the fourth lens and the fifth lens on the optical axis. More specifically, T12, T23, T34, and T45 may satisfy 2.15 < (T23+T34)/(T12+T45) < 3.65. By matching the spacing distances between adjacent lenses in the first lens to the fifth lens, the light deflection in the optical imaging system is avoided to be too large, and meanwhile, the assembly difficulty of the optical imaging system is reduced.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression Semi-FOV > 50 °, where Semi-FOV is half of the maximum field angle of the optical imaging system. More specifically, the Semi-FOV may satisfy a Semi-FOV > 56. The board market by controlling the optical imaging system is advantageous for increasing the object information obtained by the optical imaging system.
In an exemplary embodiment, the optical imaging system may further include at least one diaphragm. The diaphragm may be provided at an appropriate position as required, for example, between the second lens and the third 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, for example, six lenses as 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 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 beneficial to production and processing and can be suitable for portable electronic products. Meanwhile, the optical imaging system provided by the application has the characteristics of miniaturization and excellent optical performances such as large visual angle, low aberration, low distortion and the like.
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 to 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, the optical imaging system sequentially includes, from an object side to an image side along an optical axis: 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, and a filter E7.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, 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 convex, 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 convex 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 negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and light from an object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Table 1 shows the basic parameter table of the optical imaging system of example 1, in which the unit of the radius of curvature Y, the radius of curvature X, the thickness/distance, and the focal length are all millimeters (mm).
TABLE 1
In embodiment 1, the value of the total effective focal length f of the optical imaging system is 2.56mm, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.74mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S15 is 3.91mm, and the value of half the maximum field angle Semi-FOV is 57.1 °, and the value of the f-number Fno of the optical imaging system is 2.04.
In embodiment 1, the object side surface and the image side surface of any one of the first lens element E1 to the fifth lens element E5 are rotationally symmetrical aspherical surfaces, and the surface profile x of each rotationally symmetrical aspherical lens can be defined by, but not limited to, the following aspherical surface 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 a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows 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 mirrors S1 to S10 in example 1.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.1109E+00 -8.1263E-02 6.8602E-02 -2.6895E-03 9.7475E-03 4.2913E-04 1.6344E-03 1.4084E-04 2.1987E-04
S2 7.6298E-01 -1.2380E-01 2.1404E-02 -4.5136E-03 2.2445E-03 -1.6612E-03 -5.5150E-04 -3.9637E-04 -8.9727E-05
S3 4.7368E-04 -6.1764E-02 1.8420E-02 -1.4244E-03 4.7614E-04 -7.4723E-04 2.1537E-04 -4.7180E-05 3.1220E-06
S4 4.4850E-02 1.1779E-03 4.0628E-03 1.1898E-03 5.0779E-04 1.5846E-04 9.4744E-05 2.9099E-05 4.5171E-06
S5 7.9216E-03 -1.3996E-03 -3.4470E-05 3.3892E-05 1.9267E-05 1.5615E-05 7.7163E-06 -1.4999E-06 -3.5202E-06
S6 -1.5502E-01 1.0651E-02 -2.3810E-03 3.6610E-04 -8.3606E-05 2.1727E-05 6.9028E-06 -1.1848E-06 1.4477E-07
S7 -2.5341E-01 1.8074E-02 -2.5808E-03 1.7889E-04 -1.2392E-04 4.5274E-05 -5.1993E-07 1.4167E-05 -4.0543E-06
S8 -1.3710E-01 2.9988E-02 -3.5300E-03 4.1916E-04 -3.1666E-04 1.0948E-04 9.3227E-05 2.3927E-05 -2.9357E-05
S9 1.8973E-01 -1.4180E-02 2.5511E-03 1.5135E-03 -5.6658E-04 -5.0924E-05 -3.8606E-05 6.6097E-05 -1.6902E-05
S10 8.1387E-02 8.3293E-02 -1.3458E-02 7.2119E-03 -4.0030E-04 1.0092E-03 -5.1397E-04 -1.1086E-04 4.0679E-05
TABLE 2
As can be seen from table 1, the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are non-rotationally symmetrical aspheric surfaces (i.e., AAS surfaces), and the surface shape of the non-rotationally symmetrical aspheric surfaces can be defined by, but not limited to, the following non-rotationally symmetrical aspheric surface formula:
Wherein Z is the sagittal height of the plane parallel to the Z-axis direction; CUX and CUY are the curvatures of the vertices of the X, Y axial planes (the curvatures are the inverse of the radii of curvature); KX and KY are cone coefficients in the X, Y axial direction 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. Tables 3 and 4 below show the rotationally symmetric components of the non-rotationally symmetric aspherical surfaces S11 and S12 and the respective higher-order coefficients of the non-rotationally symmetric components, respectively, which can be used in example 1.
AAS surface AR BR CR DR ER FR GR HR JR
S11 -2.4765E-01 2.5216E-01 -2.1628E-01 1.3008E-01 -5.3548E-02 1.5016E-02 -2.7988E-03 3.1399E-04 -1.5836E-05
S12 -1.1182E-01 6.9358E-02 -3.3358E-02 1.1065E-02 -2.4614E-03 3.5925E-04 -3.3148E-05 1.7589E-06 -4.0913E-08
TABLE 3 Table 3
AAS surface AP BP CP DP EP FP GP HP JP
S11 9.1676E-03 5.3338E-03 1.4470E-03 -2.2736E-04 -1.5959E-04 6.6965E-04 1.4332E-03 1.7032E-03 1.4856E-03
S12 2.9413E-02 2.1148E-02 1.0541E-02 3.9658E-03 8.1261E-04 -4.3536E-04 -8.3448E-04 -9.5510E-04 -1.0527E-03
TABLE 4 Table 4
Fig. 2 shows the RMS spot diameter of the optical imaging system of example 1 at different image height positions within the first quadrant. Fig. 2 shows the RMS spot diameter versus true ray image height. In FIG. 2, the X-ray height and the Y-ray height are both in millimeters (mm), the minimum RMS spot diameter is 0.0022423mm, the maximum RMS spot diameter is 0.016991mm, the average value of the RMS spot diameters is 0.0055281mm, and the standard deviation of the RMS spot diameters is 0.0034366mm. As can be seen from fig. 2, 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 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 sequentially includes, from an object side to an image side along an optical axis: 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, and a filter E7.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, 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 convex, 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 convex. 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 convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and light from an object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In embodiment 2, the value of the total effective focal length f of the optical imaging system is 2.51mm, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.74mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S15 is 3.90mm, and the value of half the maximum field angle Semi-FOV is 56.9 °, and the value of the f-number Fno of the optical imaging system is 2.00.
Table 5 shows the basic parameter table of the optical imaging system of example 2, in which the unit of radius of curvature Y, radius of curvature X, thickness/distance, and focal length are all millimeters (mm). Table 6 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 7 and 8 show the rotationally symmetric components and higher-order coefficients of the rotationally symmetric components, respectively, which can be used for the rotationally asymmetric aspherical surfaces S11 and S12 in embodiment 2, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
TABLE 5
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.2827E+00 -1.0539E-01 8.3669E-02 -9.2839E-03 1.2090E-02 -7.5930E-04 1.8862E-03 -8.4650E-05 2.3299E-04
S2 9.8040E-01 -1.1333E-01 5.1740E-02 -7.3987E-03 6.3029E-03 -4.7635E-05 1.2484E-03 1.8971E-05 1.1417E-04
S3 1.4631E-01 -1.0535E-01 2.9436E-02 -7.4463E-03 3.3215E-03 -1.2821E-03 3.5404E-04 -3.2084E-04 9.4979E-05
S4 -5.2647E-02 1.7705E-02 -8.1443E-03 2.3381E-03 -6.7657E-04 -8.7703E-05 1.3511E-04 -8.9862E-05 -1.1162E-05
S5 1.6704E-02 -2.7444E-03 -5.2314E-04 -5.2774E-05 2.0419E-05 9.7124E-06 1.5042E-06 -8.2412E-06 -1.9441E-06
S6 -3.0844E-01 1.9357E-02 -6.9625E-03 1.0251E-03 -1.6911E-04 -9.9726E-05 1.1516E-04 -2.7993E-05 -1.5227E-06
S7 -3.1914E-01 3.9976E-03 5.4614E-03 1.6811E-03 1.8346E-03 -6.4557E-04 1.8143E-04 -8.2970E-05 -2.7008E-05
S8 3.0875E-03 -2.8106E-02 1.8043E-02 -4.6478E-03 5.1239E-03 -1.6700E-03 8.7630E-04 -1.0929E-04 3.5955E-06
S9 4.0737E-01 -4.2987E-02 1.3192E-02 -1.3353E-02 1.9761E-03 -2.3893E-03 -1.4407E-04 -2.3697E-05 -1.8548E-04
S10 -1.7810E-01 1.8172E-01 -4.6266E-02 -1.5404E-02 -6.4839E-03 5.0566E-03 6.9600E-05 -2.7382E-04 -4.2156E-04
TABLE 6
AAS surface AR BR CR DR ER FR GR HR JR
S11 -2.8974E-01 2.5451E-01 -2.1611E-01 1.3026E-01 -5.3510E-02 1.5015E-02 -2.8005E-03 3.1366E-04 -1.5809E-05
S12 -1.2675E-01 7.2269E-02 -3.3740E-02 1.1070E-02 -2.4577E-03 3.5922E-04 -3.3184E-05 1.7584E-06 -4.0725E-08
TABLE 7
AAS surface AP BP CP DP EP FP GP HP JP
S11 -2.8283E-03 -1.8326E-03 -5.9340E-04 -4.8974E-04 -9.9759E-05 6.9375E-04 1.4104E-03 1.6920E-03 1.5228E-03
S12 8.7364E-02 3.9449E-02 1.4679E-02 4.5333E-03 7.5452E-04 -4.4923E-04 -7.8040E-04 -9.4536E-04 -1.1958E-03
TABLE 8
Fig. 4 shows the RMS spot diameter of the optical imaging system of example 2 at different image height positions within the first quadrant. Fig. 4 shows the RMS spot diameter versus true ray image height. In FIG. 4, the X-ray height and the Y-ray height are both in millimeters (mm), the minimum RMS spot diameter is 0.003635mm, the maximum RMS spot diameter is 0.01389 mm, the average value of the RMS spot diameters is 0.0067641mm, and the standard deviation of the RMS spot diameters is 0.0023681mm. As can be seen from fig. 4, 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 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 sequentially includes, from an object side to an image side along an optical axis: 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, and a filter E7.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, 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 convex, 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 convex. 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 convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and light from an object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In embodiment 3, the value of the total effective focal length f of the optical imaging system is 2.51mm, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.74mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S15 is 3.90mm, and the value of half the Semi-FOV of the maximum field angle is 56.8 °, and the value of the f-number Fno of the optical imaging system is 2.00.
Table 9 shows a basic parameter table of the optical imaging system of embodiment 3, in which the unit of the radius of curvature Y, the radius of curvature X, the thickness/distance, and the focal length are all millimeters (mm). Table 10 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 11, 12 show the rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S11, S12 in embodiment 3, respectively, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
TABLE 9
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.2031E+00 -1.2244E-01 7.8880E-02 -1.2604E-02 1.1078E-02 -1.1207E-03 1.7154E-03 -9.3489E-05 2.1553E-04
S2 1.0218E+00 -1.3237E-01 5.6569E-02 -6.8405E-03 6.6314E-03 3.4902E-04 1.2225E-03 1.1021E-05 1.0839E-04
S3 1.6512E-01 -1.0002E-01 2.6405E-02 -6.2581E-03 2.5139E-03 -1.1959E-03 7.2452E-05 -3.4580E-04 4.5725E-05
S4 4.2423E-02 2.3147E-04 1.7968E-03 4.8153E-05 6.8543E-05 -1.3487E-04 -8.7288E-05 -6.1852E-05 -1.3597E-05
S5 1.9623E-02 -4.2879E-03 -7.0168E-04 1.7348E-05 5.5918E-05 -5.0212E-06 -2.7238E-05 -2.0928E-05 1.2729E-06
S6 -4.0554E-01 2.8709E-02 -1.1169E-02 3.5481E-03 -4.6230E-05 1.8771E-04 4.8706E-04 -3.8205E-05 9.5109E-05
S7 -3.6878E-01 4.3392E-03 1.8579E-02 5.4788E-03 2.9706E-03 -2.3660E-03 2.6149E-04 -5.7950E-04 8.9787E-05
S8 3.6504E-02 -4.6255E-02 2.3653E-02 -7.4864E-03 7.2203E-03 -2.5285E-03 1.5729E-03 -3.6059E-04 1.4482E-04
S9 4.5215E-01 -6.0970E-02 1.8244E-02 -1.9272E-02 3.9461E-03 -3.9762E-03 2.7131E-04 -3.0503E-04 -1.3779E-04
S10 -2.2582E-01 2.0113E-01 -4.7176E-02 -1.3692E-02 -6.4067E-03 5.5051E-03 -4.7972E-06 -8.9946E-05 -3.5302E-04
Table 10
AAS surface AR BR CR DR ER FR GR HR JR
S11 -2.7918E-01 2.5466E-01 -2.1722E-01 1.3039E-01 -5.3473E-02 1.5014E-02 -2.8021E-03 3.1345E-04 -1.5738E-05
S12 -1.1947E-01 7.1095E-02 -3.3614E-02 1.1075E-02 -2.4603E-03 3.5916E-04 -3.3155E-05 1.7613E-06 -4.1147E-08
TABLE 11
AAS surface AP BP CP DP EP FP GP HP JP
S11 -9.6693E-03 -8.2164E-03 -3.1606E-03 -9.2004E-04 3.1734E-05 7.3686E-04 1.3467E-03 1.7165E-03 1.7675E-03
S12 1.8394E-01 7.1527E-02 2.3189E-02 5.8740E-03 5.2312E-04 -5.6975E-04 -6.0316E-04 -8.7991E-04 -1.8563E-03
Table 12
Fig. 6 shows the RMS spot diameter of the optical imaging system of example 3 at different image height positions within the first quadrant. Fig. 6 shows the RMS spot diameter versus true ray image height. In FIG. 6, the X-ray height and the Y-ray height are both in millimeters (mm), the minimum RMS spot diameter is 0.0028903mm, the maximum RMS spot diameter is 0.053866mm, the average value of the RMS spot diameters is 0.014068mm, and the standard deviation of the RMS spot diameters is 0.011344mm. As can be seen from fig. 6, 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 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 sequentially includes, from an object side to an image side along an optical axis: 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, and a filter E7.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, 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 convex, 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 convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and light from an object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In embodiment 4, the value of the total effective focal length f of the optical imaging system is 2.51mm, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.74mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S15 is 3.90mm, and the value of half the maximum field angle Semi-FOV is 56.9 °, and the value of the f-number Fno of the optical imaging system is 2.00.
Table 13 shows a basic parameter table of the optical imaging system of example 4, in which the unit of the radius of curvature Y, the radius of curvature X, the thickness/distance, and the focal length are all millimeters (mm). Table 14 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 15 and 16 show the rotationally symmetric components and higher-order coefficients of the rotationally symmetric components, respectively, which can be used for the rotationally asymmetric aspherical surfaces S11 and S12 in embodiment 4, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
TABLE 13
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.1648E+00 -1.0472E-01 6.7181E-02 -9.6761E-03 8.5085E-03 -9.9684E-04 1.2203E-03 -1.1915E-04 1.2995E-04
S2 8.1980E-01 -1.1620E-01 3.9086E-02 -6.0667E-03 5.2597E-03 1.3749E-05 9.2926E-04 -4.6302E-05 5.5514E-05
S3 1.0558E-01 -7.5698E-02 1.7829E-02 -4.0545E-03 1.7733E-03 -6.3196E-04 2.6987E-04 -1.1203E-04 1.8152E-05
S4 2.6221E-02 2.4652E-03 2.1510E-03 3.7183E-04 1.8900E-04 4.7968E-06 5.9582E-06 -1.8122E-05 -2.3748E-06
S5 1.1400E-02 -1.4065E-03 -2.1543E-04 -2.8159E-05 -1.9321E-06 6.0181E-07 5.6768E-06 8.0657E-07 -1.0387E-06
S6 -1.7118E-01 1.2120E-02 -2.5016E-03 2.3015E-04 4.9766E-05 -3.4363E-05 -3.0431E-06 5.5422E-06 -9.2616E-07
S7 -2.3231E-01 2.6028E-03 1.3824E-03 -6.2526E-04 9.0127E-04 -2.1775E-04 5.8803E-05 1.1455E-05 -9.6412E-06
S8 -2.5370E-02 -2.0138E-03 2.4148E-02 -4.9742E-03 1.9403E-03 -4.4313E-03 -6.3667E-04 -1.0696E-03 -2.5404E-04
S9 2.3595E-01 -2.7210E-02 1.0201E-02 -3.5854E-03 9.0283E-04 -5.5652E-06 -1.5977E-04 6.6105E-05 -9.7152E-06
S10 -2.1377E-01 1.1408E-01 -1.1443E-02 3.7425E-03 -3.8300E-03 8.3019E-04 -2.1279E-04 8.8355E-05 -1.3788E-05
TABLE 14
AAS surface AR BR CR DR ER FR GR HR JR
S11 -2.8290E-01 2.5587E-01 -2.1653E-01 1.3022E-01 -5.3506E-02 1.5016E-02 -2.8005E-03 3.1370E-04 -1.5808E-05
S12 -1.2316E-01 7.1748E-02 -3.3691E-02 1.1074E-02 -2.4589E-03 3.5920E-04 -3.3179E-05 1.7595E-06 -4.0796E-08
TABLE 15
AAS surface AP BP CP DP EP FP GP HP JP
S11 -9.0775E-04 5.5378E-04 -1.0289E-04 -5.8698E-04 -1.5085E-04 7.0904E-04 1.4093E-03 1.6695E-03 1.5321E-03
S12 4.0557E-02 2.7078E-02 1.2733E-02 4.4185E-03 7.4073E-04 -5.0505E-04 -7.6790E-04 -8.0440E-04 -9.4618E-04
Table 16
Fig. 8 shows the RMS spot diameter of the optical imaging system of example 4 at different image height positions within the first quadrant. Fig. 8 shows the RMS spot diameter versus true ray image height. In FIG. 8, the X-ray height and the Y-ray height are both in millimeters (mm), the minimum RMS spot diameter is 0.0031601mm, the maximum RMS spot diameter is 0.010455mm, the average value of the RMS spot diameters is 0.0054983mm, and the standard deviation of the RMS spot diameters is 0.0017733mm. As can be seen from fig. 8, 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 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 sequentially includes, from an object side to an image side along an optical axis: 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, and a filter E7.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, 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 convex, 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 convex 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 convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and light from an object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In embodiment 5, the value of the total effective focal length f of the optical imaging system is 2.53mm, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.73mm, the value of half the diagonal length ImgH of the effective pixel region on the imaging surface S15 is 3.90mm, and the value of half the Semi-FOV of the maximum field angle is 56.9 °, and the value of the f-number Fno of the optical imaging system is 2.02.
Table 17 shows a basic parameter table of the optical imaging system of example 5, in which the unit of the radius of curvature Y, the radius of curvature X, the thickness/distance, and the focal length are all millimeters (mm). Table 18 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 19 and 20 show rotationally symmetric components and higher-order coefficients of the rotationally symmetric components, respectively, which can be used for the rotationally asymmetric aspherical surfaces S11 and S12 in embodiment 5, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
TABLE 17
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.1451E+00 -9.7698E-02 6.9900E-02 -6.0657E-03 9.2085E-03 -4.8265E-04 1.3523E-03 -6.8565E-05 1.6845E-04
S2 6.2408E-01 -1.3478E-01 4.0163E-02 -7.0003E-03 1.8385E-03 -1.1186E-03 5.6186E-04 -2.0308E-04 4.8191E-05
S3 1.5583E-01 -8.3296E-02 1.6811E-02 -4.6934E-03 -4.6717E-04 -8.4461E-04 8.6867E-04 6.3206E-05 1.5469E-05
S4 8.4308E-02 3.5960E-03 2.1979E-03 3.8407E-04 3.2583E-04 -4.0533E-05 1.8204E-05 4.2064E-06 -2.9572E-06
S5 8.2271E-04 -1.5217E-03 -1.2505E-04 4.1534E-05 -4.6238E-07 1.3055E-05 3.8698E-06 2.5585E-06 -4.7901E-06
S6 -1.6263E-01 9.3653E-03 -2.3176E-03 3.6419E-04 -9.3314E-05 1.4506E-05 1.8941E-06 -4.7544E-07 2.7483E-08
S7 -2.6556E-01 2.3722E-02 -4.4415E-03 7.0483E-04 -1.6506E-04 3.3302E-05 -1.3129E-05 1.2790E-05 -2.5820E-06
S8 -1.5664E-01 3.1033E-02 -5.0243E-03 1.0681E-03 -1.3898E-04 -7.2758E-05 1.1151E-04 1.0923E-05 -1.4188E-05
S9 -1.5664E-01 3.1033E-02 -5.0243E-03 1.0681E-03 -1.3898E-04 -7.2758E-05 1.1151E-04 1.0923E-05 -1.4188E-05
S10 -5.8122E-02 9.1172E-02 -1.5742E-02 6.9457E-03 -1.5540E-03 1.2303E-03 -5.3028E-04 -3.1947E-05 2.1096E-05
TABLE 18
AAS surface AR BR CR DR ER FR GR HR JR
S11 -2.7839E-01 2.5744E-01 -2.1609E-01 1.3008E-01 -5.3549E-02 1.5015E-02 -2.7992E-03 3.1395E-04 -1.5823E-05
S12 -1.1242E-01 6.8729E-02 -3.3194E-02 1.1058E-02 -2.4621E-03 3.5929E-04 -3.3147E-05 1.7587E-06 -4.0857E-08
TABLE 19
AAS surface AP BP CP DP EP FP GP HP JP
S11 8.0105E-03 5.7440E-03 1.4432E-03 -3.0164E-04 -1.5268E-04 6.8339E-04 1.4135E-03 1.7122E-03 1.6244E-03
S12 2.0764E-02 1.9500E-02 1.0258E-02 3.8959E-03 8.1283E-04 -4.1487E-04 -8.2089E-04 -9.4731E-04 -1.0328E-03
Table 20
Fig. 10 shows the RMS spot diameter of the optical imaging system of example 5 at different image height positions within the first quadrant. Fig. 10 shows RMS spot diameter versus true ray image height. In FIG. 10, the X-ray height and the Y-ray height are both in millimeters (mm), the minimum RMS spot diameter is 0.0024208mm, the maximum RMS spot diameter is 0.0087877mm, the average value of the RMS spot diameters is 0.0048171mm, and the standard deviation of the RMS spot diameters is 0.0011087mm. As can be seen from fig. 10, the optical imaging system provided in embodiment 5 can achieve good imaging quality.
In summary, examples 1 to 5 satisfy the relationships shown in table 21, respectively.
Table 21
The application also provides an imaging device provided with an electron-sensitive element for imaging, which can be a photosensitive coupling element (Charge Coupled Device, CCD) or a complementary metal-oxide-semiconductor element (Complementary Metal Oxide Semiconductor, CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device 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 those skilled in the art that the scope of the application is not limited to the specific combination of the above technical features, but also encompasses other technical features which may be combined with any combination of the above technical features or their equivalents without departing from the spirit of the application. 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. An optical imaging system, comprising, in order from an object side to an image side along an optical axis:
The first lens with negative focal power has a concave object side surface and a convex image side surface;
a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
A fourth lens having negative optical power;
a fifth lens having optical power, an image-side surface of which is convex;
a sixth lens element with optical power having a convex object-side surface and a concave image-side surface;
at least one of the fifth lens and the sixth lens has positive optical power;
the number of lenses having optical power in the optical imaging system is six;
the object side surface and the image side surface of any one of the first lens to the fifth lens are rotationally symmetrical aspheric surfaces;
The object side surface of the sixth lens element and the image side surface of the sixth lens element are aspheric, and the X-axis direction of the object side surface of the sixth lens element and the X-axis direction of the image side surface of the sixth lens element have a radius of curvature R11X of 0.5 < R11X/R12X < 1.5, wherein the X-axis direction is perpendicular to the optical axis and in a sagittal plane;
The effective focal length f1 of the first lens in the Y-axis direction and the effective focal length f3 of the third lens in the Y-axis direction meet-6.0 < f1/f3 < -3.0, wherein the Y-axis direction is a direction perpendicular to the optical axis and located in a meridian plane.
2. The optical imaging system according to claim 1, wherein a radius of curvature R1 in the Y-axis direction of the object-side surface of the first lens and a radius of curvature R2 in the Y-axis direction of the image-side surface of the first lens satisfy 1.5+.r2/r1+.3.0.
3. The optical imaging system according to claim 1, wherein a radius of curvature R3 in the Y-axis direction of the object side surface of the second lens and a radius of curvature R4 in the Y-axis direction of the image side surface of the second lens satisfy 1.0 < R3/R4 < 1.5.
4. The optical imaging system according to claim 1, wherein a radius of curvature R5 in the Y-axis direction of the object side surface of the third lens and a radius of curvature R6 in the Y-axis direction of the image side surface of the third lens satisfy-3.5 < R5/R6 < -1.0.
5. The optical imaging system according to claim 1, wherein a radius of curvature R10 in the Y-axis direction of the image side surface of the fifth lens, a radius of curvature R11 in the Y-axis direction of the object side surface of the sixth lens, and a radius of curvature R12 in the Y-axis direction of the image side surface of the sixth lens satisfy-2.0 < R10/(r11+r12) < -0.5.
6. The optical imaging system according to claim 1, wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy 1.5 < CT 5/(CT 1-CT 2) < 3.0.
7. The optical imaging system according to claim 1, wherein a center thickness CT3 of the third lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, and a center thickness CT6 of the sixth lens on the optical axis satisfy 1.0 < (CT 5+ct 6)/CT 3 < 2.0.
8. The optical imaging system according to claim 1, wherein a separation distance T12 of the first lens and the second lens on the optical axis, a separation distance T23 of the second lens and the third lens on the optical axis, a separation distance T34 of the third lens and the fourth lens on the optical axis, and a separation distance T45 of the fourth lens and the fifth lens on the optical axis satisfy 2.1 < (t23+t34)/(t12+t45) < 3.7.
9. The optical imaging system of any of claims 1 to 8, wherein half of the maximum field angle Semi-FOV of the optical imaging system satisfies 57.1 ° or more Semi-FOV > 50 °.
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