CN114397745B - Optical imaging system - Google Patents
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- CN114397745B CN114397745B CN202210049382.1A CN202210049382A CN114397745B CN 114397745 B CN114397745 B CN 114397745B CN 202210049382 A CN202210049382 A CN 202210049382A CN 114397745 B CN114397745 B CN 114397745B
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 196
- 238000003384 imaging method Methods 0.000 claims abstract description 185
- 230000003287 optical effect Effects 0.000 claims abstract description 116
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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
- 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
Abstract
The invention provides an optical imaging system. The optical imaging system sequentially comprises from an object side to an imaging side along an optical axis: a first lens with optical power, wherein the material of the first lens is glass; a second lens having negative optical power; a third lens having negative optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens having optical power, an object side of which is convex, and an imaging side of which is concave; a seventh lens having optical power, the object side of which is a concave surface; wherein, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.7; half of the diagonal length ImgH of the effective pixel region on the imaging plane satisfies: imgH >6.5mm. The invention solves the problem that the optical imaging system in the prior art has high pixels, large aperture and large image plane which are difficult to be simultaneously considered.
Description
Technical Field
The invention relates to the technical field of optical imaging equipment, in particular to an optical imaging system.
Background
With the development of science and technology, portable electronic products such as smart phones and tablet personal computers are rapidly developed, and in the case of smart phones, the specifications of post-positioned main shooting lenses are increasingly required by smart phone terminal manufacturers, that is to say, the requirements on optical imaging systems of the post-positioned main shooting lenses are increasingly higher, so that the volume is reduced as much as possible, and the miniaturization is satisfied; the higher imaging effect is ensured, which means that a large imaging surface is required; meanwhile, the requirements of different scenes, night shooting and the like are met. The existing optical imaging system is not easy to balance among requirements such as imaging quality, production efficiency or production cost, and brings great challenges to lens manufacturers.
That is, the optical imaging system in the prior art has a problem that it is difficult to simultaneously achieve a high pixel, a large aperture, and a large image plane.
Disclosure of Invention
The invention mainly aims to provide an optical imaging system so as to solve the problem that the optical imaging system in the prior art has high pixels, large apertures and large image planes which are difficult to be simultaneously compatible.
In order to achieve the above object, according to one aspect of the present invention, there is provided an optical imaging system comprising, in order from an object side to an imaging side along an optical axis: a first lens with optical power, wherein the material of the first lens is glass; a second lens having negative optical power; a third lens having negative optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens having optical power, an object side of which is convex, and an imaging side of which is concave; a seventh lens having optical power, the object side of which is a concave surface; wherein, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.7; half of the diagonal length ImgH of the effective pixel region on the imaging plane satisfies: imgH >6.5mm.
Further, the effective focal length f of the optical imaging system and the effective focal length f2 of the second lens satisfy: -8.0 < f2/f < -7.0.
Further, the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5.
Further, the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5.
Further, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the imaging side surface of the second lens satisfy: 8.0 < (R3+R4)/(R3-R4) < 9.0.
Further, the curvature radius R5 of the object side of the third lens and the curvature radius R10 of the imaging side of the fifth lens satisfy: R5/R10 is more than 7.5 and less than 8.5.
Further, the radius of curvature R8 of the imaging side of the fourth lens and the radius of curvature R11 of the object side of the sixth lens satisfy: -10.0 < R8/R11 < -9.0.
Further, the radius of curvature R9 of the object side of the fifth lens and the radius of curvature R11 of the object side of the sixth lens satisfy: R9/R11 is more than 6.0 and less than 7.0.
Further, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the imaging side surface of the seventh lens satisfy: -6.0 < R14/R13 < -4.5.
Further, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 6.0 < f2/f5 < 7.0.
Further, half of the maximum field angle Semi-FOV of the optical imaging system satisfies: the Semi-FOV is more than or equal to 40.0 degrees.
Further, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: TTL/ImgH < 1.3.
According to another aspect of the present invention, there is provided an optical imaging system comprising, in order from an object side to an imaging side along an optical axis: a first lens with optical power, wherein the material of the first lens is glass; a second lens having negative optical power; a third lens having negative optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens having optical power, an object side of which is convex, and an imaging side of which is concave; a seventh lens having optical power, the object side of which is a concave surface; wherein, the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5; half of the diagonal length ImgH of the effective pixel region on the imaging plane satisfies: imgH >6.5mm.
Further, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.7; the effective focal length f of the optical imaging system and the effective focal length f2 of the second lens satisfy: -8.0 < f2/f < -7.0.
Further, the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5.
Further, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the imaging side surface of the second lens satisfy: 8.0 < (R3+R4)/(R3-R4) < 9.0.
Further, the curvature radius R5 of the object side of the third lens and the curvature radius R10 of the imaging side of the fifth lens satisfy: R5/R10 is more than 7.5 and less than 8.5.
Further, the radius of curvature R8 of the imaging side of the fourth lens and the radius of curvature R11 of the object side of the sixth lens satisfy: -10.0 < R8/R11 < -9.0.
Further, the radius of curvature R9 of the object side of the fifth lens and the radius of curvature R11 of the object side of the sixth lens satisfy: R9/R11 is more than 6.0 and less than 7.0.
Further, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the imaging side surface of the seventh lens satisfy: -6.0 < R14/R13 < -4.5.
Further, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 6.0 < f2/f5 < 7.0.
Further, half of the maximum field angle Semi-FOV of the optical imaging system satisfies: the Semi-FOV is more than or equal to 40.0 degrees.
Further, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: TTL/ImgH < 1.3.
By applying the technical scheme of the invention, the optical imaging system sequentially comprises a first lens with optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with optical power, a fifth lens with optical power, a sixth lens with optical power and a seventh lens with optical power from the object side to the imaging side along the optical axis, wherein the first lens is made of glass; the object side surface of the sixth lens is a convex surface, and the imaging side surface is a concave surface; the object side surface of the seventh lens is a concave surface; wherein, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.7; half of the diagonal length ImgH of the effective pixel region on the imaging plane satisfies: imgH >6.5mm.
By controlling the focal power, the surface shape and the materials of each lens, the resolution can be improved, and the optical imaging system can still maintain perfect resolution in a larger temperature variation range. The characteristic of a large aperture of the system can be realized by restraining the ratio between the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system in a reasonable range, so that the high image quality can be ensured under the dark-light environment, and the night shooting function can be realized. The characteristic of a large image plane of the optical imaging system can be realized by restraining half of the ImgH of the diagonal line length of the effective pixel area on the imaging plane in a reasonable range so as to meet the high shooting requirement of a user. In addition, the optical imaging system is a seven-piece ultrathin glass-plastic mixed imaging lens with high pixels, large image surface and large aperture, and can better meet the use requirements of various special scenes.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic view showing the structure of an optical imaging system according to an example I of the present application;
fig. 2 to 5 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system in fig. 1;
FIG. 6 is a schematic diagram showing the structure of an optical imaging system of example II of the present application;
fig. 7 to 10 show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves, respectively, of the optical imaging system in fig. 6;
FIG. 11 is a schematic diagram showing the structure of an optical imaging system of example III of the present application;
fig. 12 to 15 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system in fig. 11;
fig. 16 is a schematic diagram showing the structure of an optical imaging system of example four of the present application;
fig. 17 to 20 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system in fig. 16;
Fig. 21 is a schematic diagram showing the structure of an optical imaging system of example five of the present invention;
fig. 22 to 25 show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves, respectively, of the optical imaging system in fig. 21;
fig. 26 is a schematic diagram showing the structure of an optical imaging system of example six of the present invention;
fig. 27 to 30 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system in fig. 26.
Wherein the above figures include the following reference numerals:
STO and diaphragm; e1, a first lens; s1, an object side surface of a first lens; s2, an imaging side surface of the first lens; e2, a second lens; s3, the object side surface of the second lens; s4, an imaging side surface of the second lens; e3, a third lens; s5, the object side surface of the third lens; s6, an imaging side surface of the third lens; e4, a fourth lens; s7, the object side surface of the fourth lens; s8, an imaging side surface of the fourth lens; e5, a fifth lens; s9, the object side surface of the fifth lens; s10, an imaging side surface of the fifth lens; e6, a sixth lens; s11, the object side surface of the sixth lens; s12, an imaging side surface of the sixth lens; e7, seventh lens; s13, an object side surface of the seventh lens; s14, an imaging side surface of the seventh lens; e8, an optical filter; s15, the object side surface of the optical filter; s16, an imaging side surface of the optical filter; s17, an imaging surface.
Detailed Description
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.
It is noted that all 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 unless otherwise indicated.
In the present application, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present application.
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. Specifically, 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 on the object side becomes the object side of the lens, and the surface of each lens on the imaging side is referred to as the imaging side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). In the object side, when the R value is positive, the object side is judged to be convex, and when the R value is negative, the object side is judged to be concave; in the image forming side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.
The invention provides an optical imaging system in order to solve the problem that the optical imaging system in the prior art has high pixels, large apertures and large image planes which are difficult to be simultaneously considered.
Example 1
As shown in fig. 1 to 30, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens having optical power, a second lens having negative optical power, a third lens having negative optical power, a fourth lens having optical power, a fifth lens having optical power, a sixth lens having optical power, and a seventh lens having optical power, the first lens being made of glass; the object side surface of the sixth lens is a convex surface, and the imaging side surface is a concave surface; the object side surface of the seventh lens is a concave surface; wherein, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.7; half of the diagonal length ImgH of the effective pixel region on the imaging plane satisfies: imgH >6.5mm.
By controlling the focal power, the surface shape and the materials of each lens, the resolution can be improved, and the optical imaging system can still maintain perfect resolution in a larger temperature variation range. The characteristic of a large aperture of the system can be realized by restraining the ratio between the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system in a reasonable range, so that the high image quality can be ensured under the dark-light environment, and the night shooting function can be realized. The characteristic of a large image plane of the optical imaging system can be realized by restraining half of the ImgH of the diagonal line length of the effective pixel area on the imaging plane in a reasonable range so as to meet the high shooting requirement of a user. In addition, the optical imaging system is a seven-piece ultrathin glass-plastic mixed imaging lens with high pixels, large image surface and large aperture, and can better meet the use requirements of various special scenes.
In the present embodiment, the effective focal length f of the optical imaging system and the effective focal length f2 of the second lens satisfy: -8.0 < f2/f < -7.0. The relation between the effective focal length f of the optical imaging system and the effective focal length f2 of the second lens is restrained within a reasonable range, so that reasonable distribution of focal power of the second lens is guaranteed, aberration is reduced, and imaging quality is improved. Preferably, -7.8 < f2/f < -7.4.
In the present embodiment, the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5. By restricting the ratio between the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens within a reasonable range, reasonable distribution of the optical powers of the third lens and the sixth lens can be ensured, aberration can be reduced, and imaging quality can be improved. Preferably, -8.4 < f3/f6 < -7.9.
In the present embodiment, the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5. The distribution of the focal power of the fourth lens and the sixth lens can be ensured by meeting the conditional expression, the total aberration can be reduced, and the imaging quality can be improved. Preferably, 4.9 < f4/f6 < 5.3.
In the present embodiment, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the imaging side surface of the second lens satisfy: 8.0 < (R3+R4)/(R3-R4) < 9.0. The curvature and the focal power of the second lens can be ensured by meeting the conditional expression, the molding processability of the second lens can be improved, and meanwhile, the aberration is reduced. Preferably, 8.3 < (R3+R4)/(R3-R4) < 8.9.
In the present embodiment, the curvature radius R5 of the object side surface of the third lens and the curvature radius R10 of the imaging side surface of the fifth lens satisfy: R5/R10 is more than 7.5 and less than 8.5. The curvature of the third lens and the fifth lens can be ensured by meeting the conditional expression, so that the processability of the third lens and the fifth lens is ensured, and meanwhile, the off-axis aberration can be reduced, and the imaging quality is improved. Preferably 7.6 < R5/R10 < 8.1.
In the present embodiment, the curvature radius R8 of the imaging side of the fourth lens and the curvature radius R11 of the object side of the sixth lens satisfy: -10.0 < R8/R11 < -9.0. The curvature of the fourth lens and the sixth lens can be ensured by meeting the conditional expression, the processability of the fourth lens and the sixth lens can be ensured, the off-axis aberration can be reduced, and the imaging quality can be improved. Preferably, -10.0 < R8/R11 < -9.4.
In the present embodiment, the curvature radius R9 of the object side of the fifth lens and the curvature radius R11 of the object side of the sixth lens satisfy: R9/R11 is more than 6.0 and less than 7.0. The curvature of the fifth lens and the sixth lens can be ensured by meeting the conditional expression, the processability of the fifth lens and the sixth lens is ensured, and meanwhile, the off-axis aberration can be effectively reduced, and the imaging quality is ensured. Preferably, 6.1 < R9/R11 < 6.6.
In the present embodiment, the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the imaging side surface of the seventh lens satisfy: -6.0 < R14/R13 < -4.5. Satisfying this conditional expression can ensure the curvature and optical power of the seventh lens, can improve the molding processability of the seventh lens, and can reduce aberration. Preferably, -5.6 < R14/R13 < -4.8.
In the present embodiment, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 6.0 < f2/f5 < 7.0. The optical power of the second lens and the optical power of the fifth lens can be reasonably distributed when the conditional expression is satisfied, the aberration is reduced, and the final imaging effect is improved. Preferably, 6.6 < f2/f5 < 6.9.
In this embodiment, half of the maximum field angle Semi-FOV of the optical imaging system satisfies: the Semi-FOV is more than or equal to 40.0 degrees. The obtained object information can be enlarged by restricting half of the Semi-FOV of the maximum field angle of the optical imaging system to a range of 40.0 ° or more. Preferably, the Semi-FOV is > 43.0.
In this embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: TTL/ImgH < 1.3. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal line length of the effective pixel area on the imaging surface is in a reasonable range, so that the whole optical imaging system has smaller volume, miniaturization is satisfied, and meanwhile, the appearance attractiveness of the optical imaging system can be improved.
Example two
As shown in fig. 1 to 30, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens having optical power, a second lens having negative optical power, a third lens having negative optical power, a fourth lens having optical power, a fifth lens having optical power, a sixth lens having optical power, and a seventh lens having optical power, the first lens being made of glass; the object side surface of the sixth lens is a convex surface, and the imaging side surface is a concave surface; the object side surface of the seventh lens is a concave surface; wherein, the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5; half of the diagonal length ImgH of the effective pixel region on the imaging plane satisfies: imgH >6.5mm.
Preferably, -8.4 < f3/f6 < -7.9.
By controlling the focal power, the surface shape and the materials of each lens, the resolution can be improved, and the optical imaging system can still maintain perfect resolution in a larger temperature variation range. By restricting the ratio between the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens within a reasonable range, reasonable distribution of the optical powers of the third lens and the sixth lens can be ensured, aberration can be reduced, and imaging quality can be improved. The characteristic of a large image plane of the optical imaging system can be realized by restraining half of the ImgH of the diagonal line length of the effective pixel area on the imaging plane in a reasonable range so as to meet the high shooting requirement of a user. In addition, the optical imaging system is a seven-piece ultrathin glass-plastic mixed imaging lens with high pixels, large image surface and large aperture, and can better meet the use requirements of various special scenes.
In the present embodiment, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.7. The characteristic of a large aperture of the system can be realized by restraining the ratio between the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system in a reasonable range, so that the high image quality can be ensured under the dark-light environment, and the night shooting function can be realized.
In the present embodiment, the effective focal length f of the optical imaging system and the effective focal length f2 of the second lens satisfy: -8.0 < f2/f < -7.0. The relation between the effective focal length f of the optical imaging system and the effective focal length f2 of the second lens is restrained within a reasonable range, so that reasonable distribution of focal power of the second lens is guaranteed, aberration is reduced, and imaging quality is improved. Preferably, -7.8 < f2/f < -7.4.
In the present embodiment, the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5. The distribution of the focal power of the fourth lens and the sixth lens can be ensured by meeting the conditional expression, the total aberration can be reduced, and the imaging quality can be improved. Preferably, 4.9 < f4/f6 < 5.3.
In the present embodiment, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the imaging side surface of the second lens satisfy: 8.0 < (R3+R4)/(R3-R4) < 9.0. The curvature and the focal power of the second lens can be ensured by meeting the conditional expression, the molding processability of the second lens can be improved, and meanwhile, the aberration is reduced. Preferably, 8.3 < (R3+R4)/(R3-R4) < 8.9.
In the present embodiment, the curvature radius R5 of the object side surface of the third lens and the curvature radius R10 of the imaging side surface of the fifth lens satisfy: R5/R10 is more than 7.5 and less than 8.5. The curvature of the third lens and the fifth lens can be ensured by meeting the conditional expression, so that the processability of the third lens and the fifth lens is ensured, and meanwhile, the off-axis aberration can be reduced, and the imaging quality is improved. Preferably 7.6 < R5/R10 < 8.1.
In the present embodiment, the curvature radius R8 of the imaging side of the fourth lens and the curvature radius R11 of the object side of the sixth lens satisfy: -10.0 < R8/R11 < -9.0. The curvature of the fourth lens and the sixth lens can be ensured by meeting the conditional expression, the processability of the fourth lens and the sixth lens can be ensured, the off-axis aberration can be reduced, and the imaging quality can be improved. Preferably, -10.0 < R8/R11 < -9.4.
In the present embodiment, the curvature radius R9 of the object side of the fifth lens and the curvature radius R11 of the object side of the sixth lens satisfy: R9/R11 is more than 6.0 and less than 7.0. The curvature of the fifth lens and the sixth lens can be ensured by meeting the conditional expression, the processability of the fifth lens and the sixth lens is ensured, and meanwhile, the off-axis aberration can be effectively reduced, and the imaging quality is ensured. Preferably, 6.1 < R9/R11 < 6.6.
In the present embodiment, the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the imaging side surface of the seventh lens satisfy: -6.0 < R14/R13 < -4.5. Satisfying this conditional expression can ensure the curvature and optical power of the seventh lens, can improve the molding processability of the seventh lens, and can reduce aberration. Preferably, -5.6 < R14/R13 < -4.8.
In the present embodiment, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 6.0 < f2/f5 < 7.0. The optical power of the second lens and the optical power of the fifth lens can be reasonably distributed when the conditional expression is satisfied, the aberration is reduced, and the final imaging effect is improved. Preferably, 6.6 < f2/f5 < 6.9.
In this embodiment, half of the maximum field angle Semi-FOV of the optical imaging system satisfies: the Semi-FOV is more than or equal to 40.0 degrees. The obtained object information can be enlarged by restricting half of the Semi-FOV of the maximum field angle of the optical imaging system to a range of 40.0 ° or more. Preferably, the Semi-FOV is > 43.0.
In this embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: TTL/ImgH < 1.3. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal line length of the effective pixel area on the imaging surface is in a reasonable range, so that the whole optical imaging system has smaller volume, miniaturization is satisfied, and meanwhile, the appearance attractiveness of the optical imaging system can be improved.
The optical imaging system described above may optionally further include a filter for correcting color deviation or a protective glass for protecting a photosensitive element located on the imaging surface.
The optical imaging system in the present application may employ a plurality of lenses, such as the seven lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like of each lens, the sensitivity of the lens can be effectively reduced, the machinability of the lens can be improved, and the optical imaging system is more beneficial to production and machining and can be applied to portable electronic equipment such as smart phones and the like. The left side is the object side and the right side is the imaging side.
In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. 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.
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 seven lenses are described as an example in the embodiment, the optical imaging system is not limited to include seven lenses. The optical imaging system may also include other numbers of lenses, if desired.
Examples of specific surface types, parameters applicable to the optical imaging system of the above embodiment are further described below with reference to the drawings.
Any of the following examples one to six is applicable to all embodiments of the present application.
Example one
As shown in fig. 1 to 5, an optical imaging system according to an example one of the present application is described. Fig. 1 shows a schematic diagram of an optical imaging system configuration of example one.
As shown in fig. 1, the optical imaging system sequentially includes, from an object side to an imaging side: 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 E1 has positive optical power, the object side S1 of the first lens is convex, and the imaging side S2 of the first lens is concave. The second lens E2 has negative focal power, the object side S3 of the second lens is a convex surface, and the imaging side S4 of the second lens is a concave surface. The third lens E3 has negative optical power, the object side S5 of the third lens is convex, and the imaging side S6 of the third lens is concave. The fourth lens E4 has positive optical power, the object side surface S7 of the fourth lens is convex, and the imaging side surface S8 of the fourth lens is convex. The fifth lens E5 has negative optical power, the object side S9 of the fifth lens is convex, and the imaging side S10 of the fifth lens is concave. The sixth lens E6 has positive optical power, the object side surface S11 of the sixth lens is convex, and the imaging side surface S12 of the sixth lens is concave. The seventh lens E7 has negative optical power, the object side surface S13 of the seventh lens is a concave surface, and the imaging side surface S14 of the seventh lens is a concave surface. The filter E8 has an object side S15 of the filter and an imaging side S16 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 6.89mm, the half of the maximum field angle Semi-FOV of the optical imaging system is 43.7 °, the total length TTL of the optical imaging system is 8.49mm and the image height ImgH is 6.71mm.
Table 1 shows a basic structural parameter table of the optical imaging system of example one, in which the unit of curvature radius, thickness/distance is millimeter (mm).
TABLE 1
In the first example, the object side and the imaging side of any one of the first to seventh lenses E1 to E7 are aspherical, and the surface shape 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 a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1-S14 in example one.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -4.4627E-02 | -1.2451E-02 | -4.7469E-03 | -1.4344E-03 | -3.8687E-04 | -8.2311E-05 | -5.8374E-05 |
| S2 | -9.4602E-02 | 1.3827E-02 | -3.0669E-03 | 3.5439E-04 | -1.9258E-04 | -2.7130E-04 | -1.2410E-04 |
| S3 | -4.2235E-02 | 4.1918E-02 | 1.4293E-03 | 2.3381E-03 | 6.4426E-07 | -3.7387E-04 | -2.0698E-04 |
| S4 | 3.0897E-02 | 1.9594E-02 | 2.3164E-03 | 2.1532E-03 | 8.2548E-04 | 2.7115E-04 | 1.2360E-04 |
| S5 | -2.3437E-01 | -1.1073E-02 | 1.6089E-03 | 2.4385E-03 | 8.0428E-04 | 3.0334E-04 | 4.2732E-05 |
| S6 | -2.6713E-01 | 8.7532E-03 | 8.2226E-03 | 4.0143E-03 | 2.7052E-04 | -1.6428E-04 | -1.5626E-04 |
| S7 | -1.8068E-01 | 2.0311E-02 | 6.7498E-03 | 2.9469E-03 | 1.2940E-04 | -1.2994E-04 | -1.3694E-04 |
| S8 | -3.5541E-01 | 1.3812E-02 | 1.1113E-02 | 8.1436E-03 | 3.8727E-03 | 1.9567E-03 | 3.9297E-04 |
| S9 | -1.0813E+00 | 4.0189E-02 | 2.8185E-02 | 4.2837E-02 | 6.6926E-05 | 7.4948E-04 | -4.0019E-03 |
| S10 | -3.5665E+00 | 5.5053E-01 | -1.9759E-01 | 3.0222E-02 | -5.1006E-02 | 7.4027E-03 | -5.1726E-03 |
| S11 | -4.2155E+00 | 5.0920E-01 | 5.2606E-02 | 1.4676E-02 | -2.9349E-02 | 1.2902E-02 | -1.9661E-03 |
| S12 | -6.8823E-01 | -5.3622E-01 | 2.5918E-01 | -1.0552E-01 | 5.8536E-02 | -1.9098E-02 | 1.1389E-02 |
| S13 | 3.3664E+00 | -2.8913E-01 | 1.7642E-02 | 3.1968E-02 | -5.4501E-02 | 2.4906E-02 | 8.1383E-03 |
| S14 | -2.7437E+00 | 4.7802E-01 | -1.5472E-02 | -1.4868E-02 | -1.2901E-02 | -1.3822E-02 | 5.1753E-03 |
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -4.1451E-05 | -4.3007E-05 | -1.9739E-05 | -1.8246E-05 | -1.4780E-05 | -1.5208E-05 | -2.5994E-06 |
| S2 | -5.5273E-05 | -1.2541E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | -1.1989E-04 | -5.4443E-05 | -1.9908E-05 | -1.5056E-05 | -9.8985E-06 | -8.0025E-06 | -1.0397E-06 |
| S4 | 4.0125E-05 | 1.4392E-05 | 2.1569E-06 | -6.7370E-07 | -3.3244E-06 | -1.4411E-06 | -1.9736E-06 |
| S5 | 3.3548E-05 | -1.0348E-05 | 1.0675E-05 | -4.4693E-06 | 6.7640E-06 | -4.1330E-06 | 7.3933E-07 |
| S6 | -1.1769E-05 | -1.9760E-05 | 1.5026E-06 | -3.8818E-06 | 4.4460E-06 | 2.1732E-06 | -1.9821E-06 |
| S7 | 1.2046E-05 | -2.4799E-05 | -5.6302E-06 | -3.8701E-06 | 4.8273E-06 | 2.1803E-06 | 1.0041E-06 |
| S8 | 3.6740E-05 | -1.0061E-04 | -8.9807E-05 | -6.4412E-05 | -4.3203E-05 | -1.5074E-05 | -1.1403E-05 |
| S9 | -1.3034E-03 | -5.6873E-04 | 5.8498E-04 | 6.0765E-04 | 4.1590E-04 | 1.4638E-04 | 5.8158E-05 |
| S10 | -7.0234E-04 | -2.6120E-03 | -2.4864E-04 | -3.3925E-04 | -1.3400E-04 | -1.6635E-04 | 4.7880E-06 |
| S11 | -2.5846E-03 | -1.7842E-03 | 1.7642E-03 | 1.7440E-04 | -1.8240E-04 | -1.3996E-04 | -6.0510E-05 |
| S12 | -2.5300E-03 | 1.0626E-03 | -1.2314E-03 | -4.7144E-04 | 3.4133E-04 | -3.0670E-04 | 3.8811E-05 |
| S13 | -1.9592E-02 | 1.2750E-02 | -4.0444E-03 | -2.4741E-04 | 7.0395E-04 | -2.1174E-04 | -1.0523E-05 |
| S14 | -1.1121E-03 | 6.1649E-03 | -5.1509E-03 | -1.6256E-04 | 6.6483E-04 | 1.8630E-04 | -1.9435E-04 |
TABLE 2
Fig. 2 shows an on-axis chromatic aberration curve of the optical imaging system of example one, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging system. Fig. 3 shows an astigmatism curve of the optical imaging system of example one, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4 shows a distortion curve of the optical imaging system of example one, which represents distortion magnitude values corresponding to different angles of view. Fig. 5 shows a magnification chromatic aberration curve of the optical imaging system of example one, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging system.
As can be seen from fig. 2 to 5, the optical imaging system according to example one can achieve good imaging quality.
Example two
As shown in fig. 6 to 10, an optical imaging system of example two of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 6 shows a schematic diagram of the structure of an optical imaging system of example two.
As shown in fig. 6, the optical imaging system sequentially includes, from an object side to an imaging side: 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 E1 has positive optical power, the object side S1 of the first lens is convex, and the imaging side S2 of the first lens is concave. The second lens E2 has negative focal power, the object side S3 of the second lens is a convex surface, and the imaging side S4 of the second lens is a concave surface. The third lens E3 has negative optical power, the object side S5 of the third lens is convex, and the imaging side S6 of the third lens is concave. The fourth lens E4 has positive optical power, the object side surface S7 of the fourth lens is convex, and the imaging side surface S8 of the fourth lens is convex. The fifth lens E5 has negative optical power, the object side S9 of the fifth lens is convex, and the imaging side S10 of the fifth lens is concave. The sixth lens E6 has positive optical power, the object side surface S11 of the sixth lens is convex, and the imaging side surface S12 of the sixth lens is concave. The seventh lens E7 has negative optical power, the object side surface S13 of the seventh lens is a concave surface, and the imaging side surface S14 of the seventh lens is a concave surface. The filter E8 has an object side S15 of the filter and an imaging side S16 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 6.74mm, the half of the maximum field angle Semi-FOV of the optical imaging system is 43.7 °, the total length TTL of the optical imaging system is 8.37mm and the image height ImgH is 6.50mm.
Table 3 shows a basic structural parameter table of the optical imaging system of example two, in which the unit of curvature radius, thickness/distance is millimeter (mm).
TABLE 3 Table 3
Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example two, where each of the aspherical surface types can be defined by equation (1) given in example one above.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -4.2474E-02 | -1.0740E-02 | -3.7871E-03 | -1.0715E-03 | -2.4105E-04 | 0.0000E+00 | 0.0000E+00 |
| S2 | -9.1932E-02 | 1.3150E-02 | -2.6888E-03 | 5.8422E-04 | -3.7714E-05 | -1.3878E-04 | -3.4018E-05 |
| S3 | -4.8478E-02 | 3.5825E-02 | 5.9368E-04 | 1.9871E-03 | 1.8788E-04 | -1.2403E-04 | -3.0664E-05 |
| S4 | 2.6904E-02 | 1.7572E-02 | 1.3661E-03 | 1.4626E-03 | 4.4845E-04 | 1.0737E-04 | 4.8666E-05 |
| S5 | -2.2837E-01 | -1.1828E-02 | 8.8478E-04 | 1.5122E-03 | 4.8132E-04 | 8.6143E-05 | 0.0000E+00 |
| S6 | -2.6159E-01 | 7.9721E-03 | 7.4076E-03 | 3.0591E-03 | 5.0019E-05 | -2.6104E-04 | -1.6811E-04 |
| S7 | -1.8149E-01 | 2.0548E-02 | 6.7772E-03 | 2.6428E-03 | 1.0029E-04 | -9.8723E-05 | -1.2286E-04 |
| S8 | -3.4862E-01 | 1.0743E-02 | 8.5513E-03 | 7.3692E-03 | 3.6627E-03 | 2.0650E-03 | 5.4008E-04 |
| S9 | -9.6214E-01 | 1.3061E-02 | 2.5465E-03 | 2.9520E-02 | 1.0030E-03 | 4.0384E-03 | -8.5188E-04 |
| S10 | -3.2251E+00 | 5.2033E-01 | -1.4869E-01 | 4.5164E-02 | -3.6356E-02 | 7.8136E-03 | -2.1856E-03 |
| S11 | -4.1989E+00 | 5.1147E-01 | 5.1663E-02 | 1.5039E-02 | -3.0079E-02 | 1.2722E-02 | -2.3564E-03 |
| S12 | -6.9759E-01 | -5.8202E-01 | 2.6265E-01 | -1.0644E-01 | 5.9149E-02 | -1.8468E-02 | 1.1943E-02 |
| S13 | 3.2123E+00 | -2.6434E-01 | 1.4868E-02 | 3.7052E-02 | -5.3239E-02 | 2.0616E-02 | 1.1664E-02 |
| S14 | -2.6984E+00 | 4.3751E-01 | -4.0522E-03 | -1.0510E-02 | -1.0525E-02 | -1.4101E-02 | 4.7363E-03 |
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | -2.2191E-05 | 6.2603E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | -3.3140E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S4 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S5 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S6 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S7 | 5.3749E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S8 | 2.1350E-04 | 3.3824E-05 | 1.0637E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S9 | -1.1114E-04 | -7.1570E-04 | -1.8253E-04 | -1.1598E-04 | 1.4609E-06 | -4.3528E-05 | 0.0000E+00 |
| S10 | 1.3347E-03 | -1.0705E-03 | 2.4461E-04 | -4.5171E-05 | 6.8696E-05 | -1.1467E-04 | 0.0000E+00 |
| S11 | -2.4566E-03 | -1.3200E-03 | 2.1674E-03 | 2.2925E-04 | -1.6366E-04 | -1.6190E-04 | 0.0000E+00 |
| S12 | -2.8538E-03 | 9.3898E-04 | -1.3900E-03 | -3.6379E-04 | 4.9807E-04 | -1.4098E-04 | 1.4503E-04 |
| S13 | -1.9298E-02 | 1.1334E-02 | -2.5501E-03 | -6.5126E-04 | 2.1645E-04 | 0.0000E+00 | 0.0000E+00 |
| S14 | -2.4081E-03 | 6.9613E-03 | -4.5631E-03 | 2.0826E-04 | 5.5902E-04 | 1.7969E-04 | -3.6629E-04 |
TABLE 4 Table 4
Fig. 7 shows an on-axis chromatic aberration curve of the optical imaging system of example two, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging system. Fig. 8 shows an astigmatism curve of the optical imaging system of example two, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 9 shows a distortion curve of the optical imaging system of example two, which represents distortion magnitude values corresponding to different angles of view. Fig. 10 shows a magnification chromatic aberration curve of the optical imaging system of example two, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging system.
As can be seen from fig. 7 to 10, the optical imaging system according to the second example can achieve good imaging quality.
Example three
As shown in fig. 11 to 15, an optical imaging system of example three of the present application is described. Fig. 11 shows a schematic diagram of the structure of an optical imaging system of example three.
As shown in fig. 11, the optical imaging system includes, in order from an object side to an imaging side: 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 E1 has positive optical power, the object side S1 of the first lens is convex, and the imaging side S2 of the first lens is concave. The second lens E2 has negative focal power, the object side S3 of the second lens is a convex surface, and the imaging side S4 of the second lens is a concave surface. The third lens E3 has negative optical power, the object side S5 of the third lens is convex, and the imaging side S6 of the third lens is concave. The fourth lens E4 has positive optical power, the object side surface S7 of the fourth lens is convex, and the imaging side surface S8 of the fourth lens is convex. The fifth lens E5 has negative optical power, the object side S9 of the fifth lens is convex, and the imaging side S10 of the fifth lens is concave. The sixth lens E6 has positive optical power, the object side surface S11 of the sixth lens is convex, and the imaging side surface S12 of the sixth lens is concave. The seventh lens E7 has negative optical power, the object side surface S13 of the seventh lens is a concave surface, and the imaging side surface S14 of the seventh lens is a concave surface. The filter E8 has an object side S15 of the filter and an imaging side S16 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 6.74mm, the half of the maximum field angle Semi-FOV of the optical imaging system is 43.7 °, the total length TTL of the optical imaging system is 8.36mm and the image height ImgH is 6.50mm.
Table 5 shows a basic structural parameter table of the optical imaging system of example three, in which the unit of curvature radius, thickness/distance is millimeter (mm).
TABLE 5
Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example three, where each of the aspherical surface types can be defined by the formula (1) given in example one above.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -4.2427E-02 | -1.0753E-02 | -3.7546E-03 | -1.0430E-03 | -2.1783E-04 | 0.0000E+00 | 0.0000E+00 |
| S2 | -9.1965E-02 | 1.3162E-02 | -2.6993E-03 | 6.0122E-04 | -3.7731E-05 | -1.3520E-04 | -4.1398E-05 |
| S3 | -4.8450E-02 | 3.5811E-02 | 5.9472E-04 | 1.9733E-03 | 1.8771E-04 | -1.2011E-04 | -2.1663E-05 |
| S4 | 2.6891E-02 | 1.7591E-02 | 1.3653E-03 | 1.4611E-03 | 4.4054E-04 | 1.0231E-04 | 4.3816E-05 |
| S5 | -2.2836E-01 | -1.1846E-02 | 8.9197E-04 | 1.5169E-03 | 4.8933E-04 | 8.6039E-05 | 0.0000E+00 |
| S6 | -2.6158E-01 | 7.9892E-03 | 7.4039E-03 | 3.0659E-03 | 5.1457E-05 | -2.5840E-04 | -1.6625E-04 |
| S7 | -1.8149E-01 | 2.0528E-02 | 6.7831E-03 | 2.6366E-03 | 1.0566E-04 | -8.7691E-05 | -1.1019E-04 |
| S8 | -3.4869E-01 | 1.0789E-02 | 8.5478E-03 | 7.3748E-03 | 3.6557E-03 | 2.0602E-03 | 5.3177E-04 |
| S9 | -9.6196E-01 | 1.2893E-02 | 2.5648E-03 | 2.9533E-02 | 1.0179E-03 | 4.0343E-03 | -8.5366E-04 |
| S10 | -3.2251E+00 | 5.2037E-01 | -1.4870E-01 | 4.5159E-02 | -3.6358E-02 | 7.8157E-03 | -2.1834E-03 |
| S11 | -4.1989E+00 | 5.1146E-01 | 5.1669E-02 | 1.5041E-02 | -3.0079E-02 | 1.2722E-02 | -2.3561E-03 |
| S12 | -6.9749E-01 | -5.8200E-01 | 2.6264E-01 | -1.0645E-01 | 5.9142E-02 | -1.8468E-02 | 1.1944E-02 |
| S13 | 3.2122E+00 | -2.6434E-01 | 1.4863E-02 | 3.7051E-02 | -5.3239E-02 | 2.0617E-02 | 1.1666E-02 |
| S14 | -2.6983E+00 | 4.3694E-01 | -3.9732E-03 | -1.0502E-02 | -1.0525E-02 | -1.4100E-02 | 4.7351E-03 |
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | -2.8360E-05 | -4.4927E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | -2.7746E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S4 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S5 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S6 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S7 | 5.9364E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S8 | 2.0793E-04 | 2.8382E-05 | 8.4657E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S9 | -1.1286E-04 | -7.1515E-04 | -1.8094E-04 | -1.1809E-04 | -1.6472E-06 | -4.2115E-05 | 0.0000E+00 |
| S10 | 1.3343E-03 | -1.0680E-03 | 2.5137E-04 | -4.6093E-05 | 7.1673E-05 | -1.1270E-04 | 0.0000E+00 |
| S11 | -2.4573E-03 | -1.3199E-03 | 2.1665E-03 | 2.2877E-04 | -1.6397E-04 | -1.6199E-04 | 0.0000E+00 |
| S12 | -2.8452E-03 | 9.2062E-04 | -1.3739E-03 | -3.6411E-04 | 5.0035E-04 | -1.4217E-04 | 1.4822E-04 |
| S13 | -1.9298E-02 | 1.1333E-02 | -2.5527E-03 | -6.5162E-04 | 2.1752E-04 | 0.0000E+00 | 0.0000E+00 |
| S14 | -2.4095E-03 | 6.9604E-03 | -4.5646E-03 | 2.1011E-04 | 5.6071E-04 | 1.7706E-04 | -3.6768E-04 |
TABLE 6
Fig. 12 shows an on-axis chromatic aberration curve of the optical imaging system of example three, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging system. Fig. 13 shows an astigmatism curve of the optical imaging system of example three, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14 shows a distortion curve of the optical imaging system of example three, which represents distortion magnitude values corresponding to different angles of view. Fig. 15 shows a magnification chromatic aberration curve of the optical imaging system of example three, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging system.
As can be seen from fig. 12 to 15, the optical imaging system given in example three can achieve good imaging quality.
Example four
As shown in fig. 16 to 20, an optical imaging system of example four of the present application is described. Fig. 16 shows a schematic diagram of the structure of an optical imaging system of example four.
As shown in fig. 16, the optical imaging system includes, in order from an object side to an imaging side: 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 E1 has positive optical power, the object side S1 of the first lens is convex, and the imaging side S2 of the first lens is concave. The second lens E2 has negative focal power, the object side S3 of the second lens is a convex surface, and the imaging side S4 of the second lens is a concave surface. The third lens E3 has negative optical power, the object side S5 of the third lens is convex, and the imaging side S6 of the third lens is concave. The fourth lens E4 has positive optical power, the object side surface S7 of the fourth lens is convex, and the imaging side surface S8 of the fourth lens is convex. The fifth lens E5 has negative optical power, the object side S9 of the fifth lens is convex, and the imaging side S10 of the fifth lens is concave. The sixth lens E6 has positive optical power, the object side surface S11 of the sixth lens is convex, and the imaging side surface S12 of the sixth lens is concave. The seventh lens E7 has negative optical power, the object side surface S13 of the seventh lens is a concave surface, and the imaging side surface S14 of the seventh lens is a concave surface. The filter E8 has an object side S15 of the filter and an imaging side S16 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 6.83mm, the half of the maximum field angle Semi-FOV of the optical imaging system is 44.0 °, the total length TTL of the optical imaging system is 8.35mm and the image height ImgH is 6.71mm.
Table 7 shows a basic structural parameter table of the optical imaging system of example four, in which the unit of curvature radius, thickness/distance is millimeter (mm).
TABLE 7
Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example four, where each of the aspherical surface types can be defined by the formula (1) given in example one above.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -5.0841E-02 | -1.5847E-02 | -6.1052E-03 | -2.1596E-03 | -6.7185E-04 | -3.2312E-04 | -2.0295E-04 |
| S2 | -1.0498E-01 | 1.4307E-02 | -5.0837E-03 | -5.9285E-04 | -1.1268E-03 | -7.9752E-04 | -3.4256E-04 |
| S3 | -3.8786E-02 | 4.5246E-02 | 1.8826E-03 | 2.2241E-03 | -3.3916E-04 | -6.7238E-04 | -3.5373E-04 |
| S4 | 3.7419E-02 | 2.3236E-02 | 3.7855E-03 | 3.0597E-03 | 1.1954E-03 | 4.3001E-04 | 1.8134E-04 |
| S5 | -2.5472E-01 | -1.0415E-02 | 3.7095E-03 | 3.7307E-03 | 1.3330E-03 | 4.8791E-04 | 1.0011E-04 |
| S6 | -2.7762E-01 | 1.1863E-02 | 1.0056E-02 | 4.5409E-03 | 1.4481E-04 | -2.8659E-04 | -2.2968E-04 |
| S7 | -1.8463E-01 | 2.2736E-02 | 7.7485E-03 | 3.0844E-03 | 5.7084E-05 | -2.1745E-04 | -1.6381E-04 |
| S8 | -3.5493E-01 | 1.3866E-02 | 1.0797E-02 | 7.9295E-03 | 3.8655E-03 | 1.8823E-03 | 3.4763E-04 |
| S9 | -9.9510E-01 | 1.4885E-02 | 7.6725E-03 | 3.4198E-02 | 1.1961E-03 | 3.1321E-03 | -1.8504E-03 |
| S10 | -3.2494E+00 | 5.2501E-01 | -1.5351E-01 | 4.5210E-02 | -3.7593E-02 | 8.0905E-03 | -2.0625E-03 |
| S11 | -4.1524E+00 | 4.8898E-01 | 5.0932E-02 | 1.6619E-02 | -2.8543E-02 | 1.2558E-02 | -1.4447E-03 |
| S12 | -7.2788E-01 | -5.3927E-01 | 2.6850E-01 | -1.0621E-01 | 6.1057E-02 | -1.9307E-02 | 1.1900E-02 |
| S13 | 3.3087E+00 | -2.8138E-01 | 1.6982E-02 | 3.3862E-02 | -5.4165E-02 | 2.3529E-02 | 9.3132E-03 |
| S14 | -2.7480E+00 | 4.7564E-01 | -1.5773E-02 | -1.5666E-02 | -1.3416E-02 | -1.3799E-02 | 5.2896E-03 |
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -1.8141E-04 | -1.1388E-04 | -8.4445E-05 | -3.9543E-05 | -3.3593E-05 | -1.1160E-05 | -6.2110E-06 |
| S2 | -1.1176E-04 | -1.4901E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | -2.1635E-04 | -8.6775E-05 | -5.3022E-05 | -2.5750E-05 | -1.8251E-05 | 3.3071E-07 | 5.3734E-07 |
| S4 | 5.1838E-05 | 9.5855E-06 | -8.6409E-06 | -1.1989E-05 | -1.0478E-05 | -5.9619E-06 | -3.6506E-06 |
| S5 | 5.5881E-05 | -1.2910E-06 | 1.5491E-05 | -3.3414E-06 | 6.2429E-06 | -5.4508E-06 | 1.5146E-06 |
| S6 | -1.0531E-05 | -2.7472E-05 | 4.1690E-06 | -7.3460E-06 | 7.9615E-06 | 2.3903E-07 | 6.3934E-07 |
| S7 | 1.2095E-05 | -2.7487E-05 | -6.5636E-06 | -6.6856E-07 | 7.0800E-06 | 3.1677E-06 | 1.4517E-07 |
| S8 | 3.4023E-06 | -1.1503E-04 | -9.2076E-05 | -6.9500E-05 | -3.3697E-05 | -1.2703E-05 | 4.3615E-06 |
| S9 | -5.9972E-04 | -8.2502E-04 | -1.1937E-04 | 5.1246E-05 | 7.9960E-05 | 5.3949E-05 | 1.6368E-05 |
| S10 | 1.3201E-03 | -1.2084E-03 | 1.2291E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S11 | -2.3655E-03 | -1.8765E-03 | 1.5988E-03 | 2.4763E-04 | -1.2310E-04 | -4.0976E-05 | -9.3519E-05 |
| S12 | -3.0462E-03 | 5.8962E-04 | -1.4783E-03 | -5.8083E-04 | 3.2829E-04 | -4.5775E-04 | 4.5426E-05 |
| S13 | -1.9492E-02 | 1.2253E-02 | -3.6848E-03 | -3.3751E-04 | 6.8239E-04 | -1.7348E-04 | -1.3160E-05 |
| S14 | -1.1401E-03 | 6.0222E-03 | -5.2709E-03 | -5.1137E-05 | 7.2225E-04 | 1.5531E-04 | -1.9282E-04 |
TABLE 8
Fig. 17 shows an on-axis chromatic aberration curve of the optical imaging system of example four, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging system. Fig. 18 shows an astigmatism curve of the optical imaging system of example four, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 19 shows a distortion curve of the optical imaging system of example four, which represents distortion magnitude values corresponding to different angles of view. Fig. 20 shows a magnification chromatic aberration curve of the optical imaging system of example four, which represents deviations of different image heights on an imaging plane after light passes through the optical imaging system.
As can be seen from fig. 17 to 20, the optical imaging system as given in example four can achieve good imaging quality.
Example five
As shown in fig. 21 to 25, an optical imaging system of example five of the present application is described. Fig. 21 shows a schematic diagram of the structure of an optical imaging system of example five.
As shown in fig. 21, the optical imaging system includes, in order from an object side to an imaging side: 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 E1 has positive optical power, the object side S1 of the first lens is convex, and the imaging side S2 of the first lens is concave. The second lens E2 has negative focal power, the object side S3 of the second lens is a convex surface, and the imaging side S4 of the second lens is a concave surface. The third lens E3 has negative optical power, the object side S5 of the third lens is convex, and the imaging side S6 of the third lens is concave. The fourth lens E4 has positive optical power, the object side surface S7 of the fourth lens is convex, and the imaging side surface S8 of the fourth lens is convex. The fifth lens E5 has negative optical power, the object side S9 of the fifth lens is convex, and the imaging side S10 of the fifth lens is concave. The sixth lens E6 has positive optical power, the object side surface S11 of the sixth lens is convex, and the imaging side surface S12 of the sixth lens is concave. The seventh lens E7 has negative optical power, the object side surface S13 of the seventh lens is a concave surface, and the imaging side surface S14 of the seventh lens is a concave surface. The filter E8 has an object side S15 of the filter and an imaging side S16 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 6.89mm, the half of the maximum field angle Semi-FOV of the optical imaging system is 43.4 °, the total length TTL of the optical imaging system is 8.49mm and the image height ImgH is 6.71mm.
Table 9 shows a basic structural parameter table of the optical imaging system of example five, in which the unit of curvature radius, thickness/distance is millimeter (mm).
TABLE 9
Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example five, where each of the aspherical surface types can be defined by equation (1) given in example one above.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -4.4408E-02 | -1.2440E-02 | -4.7525E-03 | -1.5217E-03 | -4.9211E-04 | -1.8249E-04 | -1.2942E-04 |
| S2 | -9.4685E-02 | 1.3855E-02 | -3.1685E-03 | 1.2179E-04 | -3.7429E-04 | -2.9644E-04 | -1.1331E-04 |
| S3 | -4.2580E-02 | 4.1967E-02 | 1.3671E-03 | 1.9498E-03 | -2.6536E-04 | -4.2870E-04 | -2.1211E-04 |
| S4 | 3.0738E-02 | 1.9682E-02 | 2.5015E-03 | 2.1225E-03 | 7.5264E-04 | 2.3750E-04 | 9.9368E-05 |
| S5 | -2.3522E-01 | -1.1266E-02 | 1.5555E-03 | 2.3686E-03 | 7.6273E-04 | 2.7277E-04 | 2.6825E-05 |
| S6 | -2.6676E-01 | 8.7764E-03 | 8.1672E-03 | 3.7423E-03 | 2.3813E-04 | -2.0040E-04 | -1.7686E-04 |
| S7 | -1.8086E-01 | 2.0253E-02 | 6.6289E-03 | 2.7448E-03 | 2.1652E-04 | -1.0421E-04 | -1.5948E-04 |
| S8 | -3.5598E-01 | 1.3626E-02 | 1.1134E-02 | 8.1018E-03 | 3.9694E-03 | 1.9913E-03 | 3.5832E-04 |
| S9 | -1.0816E+00 | 4.0226E-02 | 2.8625E-02 | 4.2083E-02 | 2.1172E-04 | 8.1364E-04 | -3.9994E-03 |
| S10 | -3.5657E+00 | 5.5049E-01 | -1.9716E-01 | 2.9517E-02 | -5.0975E-02 | 7.2719E-03 | -5.2126E-03 |
| S11 | -4.2167E+00 | 5.0889E-01 | 5.2092E-02 | 1.5557E-02 | -2.9529E-02 | 1.3280E-02 | -2.1354E-03 |
| S12 | -6.8189E-01 | -5.3563E-01 | 2.5967E-01 | -1.0653E-01 | 5.8444E-02 | -1.9065E-02 | 1.1317E-02 |
| S13 | 3.3666E+00 | -2.9002E-01 | 1.7455E-02 | 3.1825E-02 | -5.4515E-02 | 2.4921E-02 | 8.5170E-03 |
| S14 | -2.7408E+00 | 4.7334E-01 | -1.5073E-02 | -1.4666E-02 | -1.2712E-02 | -1.3771E-02 | 5.0306E-03 |
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -8.7516E-05 | -6.8937E-05 | -3.6270E-05 | -2.5775E-05 | -1.0088E-05 | -4.4393E-06 | 4.0137E-06 |
| S2 | -3.1069E-05 | -7.9957E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | -9.7755E-05 | -4.3389E-05 | -1.3041E-05 | -9.1706E-06 | -2.8664E-06 | -1.7876E-06 | 1.6942E-06 |
| S4 | 2.6535E-05 | 6.9632E-06 | -1.2175E-06 | -1.0908E-06 | -3.2054E-06 | 4.2044E-07 | -5.7800E-07 |
| S5 | 3.7113E-05 | -1.0212E-05 | 1.3826E-05 | -5.8298E-06 | 6.0015E-06 | -5.1068E-06 | 1.9135E-06 |
| S6 | 7.1045E-06 | -3.1410E-05 | 2.8670E-06 | -8.3024E-06 | 5.6787E-06 | -1.7514E-06 | -1.4930E-06 |
| S7 | 4.4417E-05 | -4.4737E-05 | -1.0188E-06 | -5.8622E-06 | 1.0673E-05 | -7.0295E-07 | 2.3961E-06 |
| S8 | 1.8843E-05 | -1.3254E-04 | -1.1520E-04 | -8.2440E-05 | -4.6140E-05 | -1.4968E-05 | -9.6819E-06 |
| S9 | -1.2429E-03 | -5.2919E-04 | 5.7342E-04 | 5.6983E-04 | 3.8993E-04 | 1.4344E-04 | 6.8120E-05 |
| S10 | -4.5932E-04 | -2.5603E-03 | -3.8368E-04 | -4.2689E-04 | -2.2790E-04 | -1.7488E-04 | 1.1894E-05 |
| S11 | -2.2978E-03 | -1.5048E-03 | 2.0660E-03 | 4.7805E-04 | -3.1553E-04 | -2.1015E-04 | -5.4030E-05 |
| S12 | -2.5866E-03 | 8.6094E-04 | -1.1048E-03 | -1.8905E-04 | 3.6089E-04 | -1.6410E-04 | -3.8835E-05 |
| S13 | -1.9668E-02 | 1.2937E-02 | -3.9334E-03 | -4.8711E-04 | 6.1975E-04 | 5.1937E-05 | -1.5967E-04 |
| S14 | -1.4554E-03 | 6.1931E-03 | -5.0310E-03 | 4.5069E-04 | 7.4876E-04 | 5.3182E-05 | -2.6490E-04 |
Table 10
Fig. 22 shows an on-axis chromatic aberration curve of the optical imaging system of example five, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging system. Fig. 23 shows an astigmatism curve of the optical imaging system of example five, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 24 shows a distortion curve of the optical imaging system of example five, which represents distortion magnitude values corresponding to different angles of view. Fig. 25 shows a magnification chromatic aberration curve of the optical imaging system of example five, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging system.
As can be seen from fig. 22 to 25, the optical imaging system given in example five can achieve good imaging quality.
Example six
As shown in fig. 26 to 30, an optical imaging system of example six of the present application is described. Fig. 26 shows a schematic diagram of the structure of an optical imaging system of example six.
As shown in fig. 26, the optical imaging system includes, in order from an object side to an imaging side: 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 E1 has positive optical power, the object side S1 of the first lens is convex, and the imaging side S2 of the first lens is concave. The second lens E2 has negative focal power, the object side S3 of the second lens is a convex surface, and the imaging side S4 of the second lens is a concave surface. The third lens E3 has negative optical power, the object side S5 of the third lens is convex, and the imaging side S6 of the third lens is concave. The fourth lens E4 has positive optical power, the object side surface S7 of the fourth lens is convex, and the imaging side surface S8 of the fourth lens is convex. The fifth lens E5 has negative optical power, the object side S9 of the fifth lens is convex, and the imaging side S10 of the fifth lens is concave. The sixth lens E6 has positive optical power, the object side surface S11 of the sixth lens is convex, and the imaging side surface S12 of the sixth lens is concave. The seventh lens E7 has negative optical power, the object side surface S13 of the seventh lens is a concave surface, and the imaging side surface S14 of the seventh lens is a concave surface. The filter E8 has an object side S15 of the filter and an imaging side S16 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the optical imaging system is 6.90mm, the half of the maximum field angle Semi-FOV of the optical imaging system is 43.4 °, the total length TTL of the optical imaging system is 8.50mm and the image height ImgH is 6.71mm.
Table 11 shows a basic structural parameter table of the optical imaging system of example six, in which the unit of curvature radius, thickness/distance is millimeter (mm).
TABLE 11
Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example six, where each of the aspherical surface types can be defined by equation (1) given in example one above.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -4.4455E-02 | -1.2400E-02 | -4.8037E-03 | -1.5040E-03 | -4.7117E-04 | -1.3513E-04 | -8.6888E-05 |
| S2 | -9.4630E-02 | 1.3846E-02 | -3.2473E-03 | 1.5990E-04 | -3.2640E-04 | -2.5622E-04 | -8.0828E-05 |
| S3 | -4.2419E-02 | 4.2046E-02 | 1.4892E-03 | 2.1203E-03 | -1.3134E-04 | -3.4208E-04 | -1.5994E-04 |
| S4 | 3.0734E-02 | 1.9727E-02 | 2.5976E-03 | 2.1935E-03 | 8.0921E-04 | 2.7485E-04 | 1.2697E-04 |
| S5 | -2.3510E-01 | -1.1256E-02 | 1.6030E-03 | 2.4227E-03 | 7.9734E-04 | 2.9479E-04 | 4.1372E-05 |
| S6 | -2.6695E-01 | 8.7337E-03 | 8.1383E-03 | 3.7751E-03 | 2.5625E-04 | -1.8215E-04 | -1.6366E-04 |
| S7 | -1.8079E-01 | 2.0308E-02 | 6.6437E-03 | 2.7482E-03 | 2.0912E-04 | -1.0922E-04 | -1.5747E-04 |
| S8 | -3.5611E-01 | 1.3449E-02 | 1.1190E-02 | 8.1198E-03 | 3.9431E-03 | 1.9826E-03 | 3.5809E-04 |
| S9 | -1.0815E+00 | 4.0202E-02 | 2.8530E-02 | 4.2278E-02 | 2.1484E-04 | 7.8130E-04 | -4.0304E-03 |
| S10 | -3.5662E+00 | 5.5050E-01 | -1.9733E-01 | 2.9638E-02 | -5.0882E-02 | 7.2967E-03 | -5.1971E-03 |
| S11 | -4.2176E+00 | 5.0853E-01 | 5.2225E-02 | 1.5304E-02 | -2.9464E-02 | 1.3287E-02 | -2.0501E-03 |
| S12 | -6.8414E-01 | -5.3470E-01 | 2.5944E-01 | -1.0623E-01 | 5.8446E-02 | -1.9035E-02 | 1.1331E-02 |
| S13 | 3.3672E+00 | -2.9002E-01 | 1.7480E-02 | 3.1859E-02 | -5.4501E-02 | 2.4920E-02 | 8.4759E-03 |
| S14 | -2.7419E+00 | 4.7380E-01 | -1.5061E-02 | -1.4775E-02 | -1.2739E-02 | -1.3790E-02 | 5.0433E-03 |
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -4.2948E-05 | -3.7061E-05 | -1.0005E-05 | -7.8121E-06 | 4.5250E-06 | 4.9811E-06 | 9.7102E-06 |
| S2 | -1.6414E-05 | 6.5281E-07 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | -7.8808E-05 | -3.7452E-05 | -1.8167E-05 | -1.4281E-05 | -7.1745E-06 | -4.1127E-06 | 9.6716E-07 |
| S4 | 4.0726E-05 | 1.6768E-05 | 3.7867E-06 | 3.2381E-06 | -5.2693E-08 | 1.7402E-06 | -9.6764E-07 |
| S5 | 4.5637E-05 | -5.3456E-06 | 1.6833E-05 | -5.0409E-06 | 5.6452E-06 | -5.6663E-06 | 2.3683E-06 |
| S6 | 1.8803E-05 | -2.6334E-05 | 6.8086E-06 | -7.6118E-06 | 6.2172E-06 | -2.4168E-06 | -1.1941E-06 |
| S7 | 5.2118E-05 | -4.1028E-05 | 2.7625E-06 | -5.2234E-06 | 1.1473E-05 | -4.3503E-07 | 3.1590E-06 |
| S8 | 3.5641E-05 | -1.1622E-04 | -9.9244E-05 | -7.3260E-05 | -4.0347E-05 | -1.3493E-05 | -8.7411E-06 |
| S9 | -1.2512E-03 | -5.1953E-04 | 5.7038E-04 | 5.6649E-04 | 3.8950E-04 | 1.4895E-04 | 7.4223E-05 |
| S10 | -4.9173E-04 | -2.5389E-03 | -3.7497E-04 | -3.8684E-04 | -1.8930E-04 | -1.3618E-04 | 3.0321E-05 |
| S11 | -2.3559E-03 | -1.5386E-03 | 2.0013E-03 | 4.3184E-04 | -3.6190E-04 | -2.3571E-04 | -6.5466E-05 |
| S12 | -2.5631E-03 | 8.8735E-04 | -1.1017E-03 | -2.1902E-04 | 3.5230E-04 | -1.7137E-04 | -2.9205E-05 |
| S13 | -1.9679E-02 | 1.2922E-02 | -3.9515E-03 | -4.3738E-04 | 6.1198E-04 | 1.6522E-05 | -1.3211E-04 |
| S14 | -1.4472E-03 | 6.2595E-03 | -5.0432E-03 | 3.7510E-04 | 7.4037E-04 | 4.9725E-05 | -2.5474E-04 |
Table 12
Fig. 27 shows an on-axis chromatic aberration curve of the optical imaging system of example six, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 28 shows an astigmatism curve of the optical imaging system of example six, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 29 shows a distortion curve of the optical imaging system of example six, which represents distortion magnitude values corresponding to different angles of view. Fig. 30 shows a magnification chromatic aberration curve of the optical imaging system of example six, which represents deviations of different image heights on an imaging plane after light passes through the optical imaging system.
As can be seen from fig. 27 to 30, the optical imaging system given in example six can achieve good imaging quality.
In summary, examples one to six satisfy the relationships shown in table 13, respectively.
| Condition/example | 1 | 2 | 3 | 4 | 5 | 6 |
| ImgH | 6.71 | 6.50 | 6.50 | 6.71 | 6.71 | 6.71 |
| f/EPD | 1.62 | 1.60 | 1.70 | 1.60 | 1.67 | 1.67 |
| f2/f | -7.46 | -7.74 | -7.74 | -7.71 | -7.59 | -7.52 |
| f3/f6 | -8.22 | -8.02 | -8.02 | -8.33 | -7.95 | -8.00 |
| f4/f6 | 5.22 | 4.94 | 4.94 | 5.21 | 5.10 | 5.12 |
| (R3+R4)/(R3-R4) | 8.37 | 8.86 | 8.86 | 8.69 | 8.57 | 8.49 |
| R5/R10 | 7.99 | 7.65 | 7.64 | 7.88 | 8.06 | 8.03 |
| R7/R10 | 7.97 | 7.39 | 7.39 | 7.83 | 7.78 | 7.79 |
| R8/R11 | -9.82 | -9.45 | -9.45 | -9.92 | -9.61 | -9.65 |
| R9/R11 | 6.17 | 6.50 | 6.50 | 6.28 | 6.25 | 6.23 |
| R14/R13 | -5.58 | -4.87 | -4.86 | -5.49 | -5.31 | -5.34 |
| f2/f5 | 6.64 | 6.86 | 6.87 | 6.84 | 6.78 | 6.71 |
| Semi-FOV | 43.7 | 43.7 | 43.7 | 44.0 | 43.4 | 43.4 |
| TTL/ImgH | 1.26 | 1.29 | 1.29 | 1.24 | 1.27 | 1.27 |
TABLE 13
Table 14 shows the effective focal lengths f of the optical imaging systems of examples one to six, the effective focal lengths f1 to f7 of the respective lenses, and the like.
| Parameters/examples | 1 | 2 | 3 | 4 | 5 | 6 |
| f(mm) | 6.89 | 6.74 | 6.74 | 6.83 | 6.89 | 6.90 |
| f1(mm) | 8.24 | 8.22 | 8.22 | 8.24 | 8.24 | 8.24 |
| f2(mm) | -51.46 | -52.20 | -52.20 | -52.61 | -52.31 | -51.86 |
| f3(mm) | -32.57 | -31.76 | -31.76 | -33.01 | -31.51 | -31.71 |
| f4(mm) | 20.68 | 19.58 | 19.57 | 20.63 | 20.21 | 20.28 |
| f5(mm) | -7.75 | -7.60 | -7.60 | -7.69 | -7.72 | -7.73 |
| f6(mm) | 3.96 | 3.96 | 3.96 | 3.96 | 3.96 | 3.96 |
| f7(mm) | -4.86 | -4.85 | -4.85 | -4.86 | -4.85 | -4.85 |
| TTL(mm) | 8.49 | 8.37 | 8.36 | 8.35 | 8.49 | 8.50 |
| ImgH(mm) | 6.71 | 6.50 | 6.50 | 6.71 | 6.71 | 6.71 |
| Semi-FOV(°) | 43.7 | 43.7 | 43.7 | 44.0 | 43.4 | 43.4 |
TABLE 14
The application also provides an imaging 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 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.
It will be apparent that the embodiments described above are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (19)
1. An optical imaging system, comprising, in order from an object side to an imaging side along an optical axis:
a first lens having positive optical power, the first lens being of glass;
a second lens having negative optical power;
a third lens having negative optical power;
a fourth lens having positive optical power;
a fifth lens having negative optical power;
a sixth lens having positive optical power, the object side of which is convex, and the imaging side of which is concave;
A seventh lens having negative optical power, the object side of which is a concave surface;
wherein, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.7; half of the diagonal length ImgH of the effective pixel region on the imaging plane satisfies: imgH >6.5mm; an effective focal length f2 of the second lens and an effective focal length f5 of the fifth lens satisfy: f2/f5 is more than 6.0 and less than 7.0; an on-axis distance TTL from an object side surface of the first lens to the imaging surface and a half of a diagonal length ImgH of an effective pixel region on the imaging surface satisfy: TTL/ImgH is less than 1.3; the number of lenses having optical power in the optical imaging system is 7.
2. The optical imaging system of claim 1, wherein an effective focal length f of the optical imaging system and an effective focal length f2 of the second lens satisfy: -8.0 < f2/f < -7.0.
3. The optical imaging system of claim 1, wherein an effective focal length f3 of the third lens and an effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5.
4. The optical imaging system of claim 1, wherein an effective focal length f4 of the fourth lens and an effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5.
5. The optical imaging system of claim 1, wherein a radius of curvature R3 of the object side of the second lens and a radius of curvature R4 of the imaging side of the second lens satisfy: 8.0 < (R3+R4)/(R3-R4) < 9.0.
6. The optical imaging system of claim 1, wherein a radius of curvature R5 of an object side of the third lens and a radius of curvature R10 of an imaging side of the fifth lens satisfy: R5/R10 is more than 7.5 and less than 8.5.
7. The optical imaging system of claim 1, wherein a radius of curvature R8 of the imaging side of the fourth lens and a radius of curvature R11 of the object side of the sixth lens satisfy: -10.0 < R8/R11 < -9.0.
8. The optical imaging system of claim 1, wherein a radius of curvature R9 of the object side of the fifth lens and a radius of curvature R11 of the object side of the sixth lens satisfy: R9/R11 is more than 6.0 and less than 7.0.
9. The optical imaging system of claim 1, wherein a radius of curvature R13 of an object side of the seventh lens and a radius of curvature R14 of an imaging side of the seventh lens satisfy: -6.0 < R14/R13 < -4.5.
10. The optical imaging system of claim 1, wherein half of the maximum field angle Semi-FOV of the optical imaging system satisfies: the Semi-FOV is more than or equal to 40.0 degrees.
11. An optical imaging system, comprising, in order from an object side to an imaging side along an optical axis:
a first lens having positive optical power, the first lens being of glass;
a second lens having negative optical power;
a third lens having negative optical power;
a fourth lens having positive optical power;
a fifth lens having negative optical power;
a sixth lens having positive optical power, the object side of which is convex, and the imaging side of which is concave;
a seventh lens having negative optical power, the object side of which is a concave surface;
wherein, the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -8.5 < f3/f6 < -7.5; half of the diagonal length ImgH of the effective pixel region on the imaging plane satisfies: imgH >6.5mm; the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 1.7; an on-axis distance TTL from an object side surface of the first lens to the imaging surface and a half of a diagonal length ImgH of an effective pixel region on the imaging surface satisfy: TTL/ImgH is less than 1.3; the number of lenses having optical power in the optical imaging system is 7.
12. The optical imaging system of claim 11, wherein an effective focal length f of the optical imaging system and an effective focal length f2 of the second lens satisfy: -8.0 < f2/f < -7.0.
13. The optical imaging system of claim 11, wherein an effective focal length f4 of the fourth lens and an effective focal length f6 of the sixth lens satisfy: 4.5 < f4/f6 < 5.5.
14. The optical imaging system of claim 11, wherein a radius of curvature R3 of the object side of the second lens and a radius of curvature R4 of the imaging side of the second lens satisfy: 8.0 < (R3+R4)/(R3-R4) < 9.0.
15. The optical imaging system of claim 11, wherein a radius of curvature R5 of the object side of the third lens and a radius of curvature R10 of the image side of the fifth lens satisfy: R5/R10 is more than 7.5 and less than 8.5.
16. The optical imaging system of claim 11, wherein a radius of curvature R8 of the imaging side of the fourth lens and a radius of curvature R11 of the object side of the sixth lens satisfy: -10.0 < R8/R11 < -9.0.
17. The optical imaging system of claim 11, wherein a radius of curvature R9 of the object side of the fifth lens and a radius of curvature R11 of the object side of the sixth lens satisfy: R9/R11 is more than 6.0 and less than 7.0.
18. The optical imaging system of claim 11, wherein a radius of curvature R13 of an object side of the seventh lens and a radius of curvature R14 of an imaging side of the seventh lens satisfy: -6.0 < R14/R13 < -4.5.
19. The optical imaging system of claim 11, wherein half of the maximum field angle Semi-FOV of the optical imaging system satisfies: the Semi-FOV is more than or equal to 40.0 degrees.
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| CN214151198U (en) * | 2020-12-04 | 2021-09-07 | 江西晶超光学有限公司 | Optical system, image capturing device and electronic device |
| CN113933968A (en) * | 2021-10-18 | 2022-01-14 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
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| CN214151198U (en) * | 2020-12-04 | 2021-09-07 | 江西晶超光学有限公司 | Optical system, image capturing device and electronic device |
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