CN115437116B - Optical imaging system, image capturing device and electronic equipment - Google Patents
Optical imaging system, image capturing device and electronic equipment Download PDFInfo
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- CN115437116B CN115437116B CN202211152972.3A CN202211152972A CN115437116B CN 115437116 B CN115437116 B CN 115437116B CN 202211152972 A CN202211152972 A CN 202211152972A CN 115437116 B CN115437116 B CN 115437116B
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 152
- 238000003384 imaging method Methods 0.000 claims abstract description 39
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 238000010586 diagram Methods 0.000 description 40
- 230000004075 alteration Effects 0.000 description 22
- 230000000694 effects Effects 0.000 description 18
- 201000009310 astigmatism Diseases 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The application provides an optical imaging system, an image capturing device and electronic equipment. The optical imaging system provided by the application has seven lenses with refractive power, and the lens comprises the following components in sequence from an object side to an image side: a first lens element with positive refractive power; a second lens element with negative refractive power; a third lens element with positive refractive power; a fourth lens element with refractive power; a fifth lens element with refractive power; a sixth lens element with positive refractive power; and a seventh lens element with negative refractive power; wherein the optical imaging system satisfies the following conditional expression: 2.2< fno ttl/Imgh <2.3; wherein FNO is the f-number of the optical imaging system, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, imgh is half of the image height corresponding to the maximum field angle of the optical imaging system. The system of the optical imaging system has the characteristic of large aperture, and can improve the resolution of the optical imaging system under the condition of realizing miniaturization.
Description
Technical Field
The present application relates to optical imaging technology, and in particular, to an optical imaging system, an image capturing device, and an electronic apparatus.
Background
With the updating of technology, the imaging quality requirements of consumers on mobile electronic products are also higher. With the improvement of the performance of the photo-sensing devices such as photo-coupler (Charge Coupled Device, CCD) and Complementary Metal Oxide Semiconductor (CMOS), it is possible to shoot higher quality images for mobile electronic products along with the technological progress. However, the current application of imaging lens in mobile electronic products cannot meet the requirements of the mobile electronic products for high quality image quality in terms of image quality, resolution, definition and the like.
Disclosure of Invention
Therefore, the embodiment of the application provides an optical imaging system, which has large light incoming quantity and can well meet the requirement of a camera on high-quality image quality.
It is also necessary to provide an imaging device using the above optical imaging system.
In addition, it is necessary to provide an electronic apparatus using the above-described image capturing device.
The embodiment of the application provides an optical imaging system, which has seven lenses with refractive power, and the lenses sequentially from an object side to an image side are as follows:
a first lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a second lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
A third lens element with positive refractive power;
A fourth lens element with refractive power;
The fifth lens element with refractive power has a concave object-side surface at a paraxial region;
The sixth lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; and
The seventh lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
Wherein the optical imaging system satisfies the following conditional expression:
2.2<FNO*TTL/Imgh<2.3；
Wherein FNO is the f-number of the optical imaging system, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, imgh is half of the image height corresponding to the maximum field angle of the optical imaging system.
The optical imaging system of the present application satisfies the following: 2.2< FNO TTL/Imgh <2.3, so that the optical imaging system obtains larger relative aperture and larger image surface, can improve the dim light shooting condition, is suitable for shooting in dim light environments such as night scenes, rainy days, starry sky and the like, has better blurring effect, and simultaneously effectively reduces the total size of the optical imaging system, thereby improving the resolution of the optical imaging system under the condition of realizing miniaturization, further enabling the optical imaging system to obtain more scene contents, enriching the imaging information of the system, and enabling the optical imaging system to have better imaging effect.
The embodiment of the application also provides an image capturing device, which comprises:
The optical imaging system described above; and
And the photosensitive element is positioned on the image side of the optical imaging system.
The image capturing device provided by the application has the advantages of ensuring miniaturization, simultaneously having larger light inlet quantity and higher imaging effect.
The embodiment of the application also provides electronic equipment, which comprises:
An apparatus main body; and
In the above image capturing device, the image capturing device is mounted on the apparatus main body.
The camera of the electronic equipment has larger light incoming quantity and higher imaging effect, and is beneficial to improving the shooting effect of the electronic equipment.
Therefore, the system of the optical imaging system has the characteristics of large aperture, large light entering quantity, improved dim light shooting condition, suitability for shooting in dim light environments such as night scenes, rainy days, starry sky and the like, better blurring effect, and capability of improving the resolution of the optical imaging system under the condition of realizing miniaturization, so that the optical imaging system has better imaging effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1-1 is a schematic diagram of the structure of an optical imaging system according to a first embodiment of the present application.
Fig. 1-2 are, in order from left to right, a spherical aberration diagram, an astigmatic diagram, and a distortion curve diagram of an optical imaging system according to a first embodiment of the present application.
Fig. 2-1 is a schematic structural view of an optical imaging system according to a second embodiment of the present application.
Fig. 2-2 is a view of the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the second embodiment of the present application, in order from left to right.
Fig. 3-1 is a schematic structural view of an optical imaging system according to a third embodiment of the present application.
Fig. 3-2 shows, in order from left to right, a spherical aberration diagram, an astigmatic diagram, and a distortion curve diagram of an optical imaging system according to a third embodiment of the present application.
Fig. 4-1 is a schematic structural view of an optical imaging system according to a fourth embodiment of the present application.
Fig. 4-2 is a view showing, in order from left to right, a spherical aberration diagram, an astigmatic diagram, and a distortion curve diagram of an optical imaging system according to a fourth embodiment of the present application.
Fig. 5-1 is a schematic structural view of an optical imaging system according to a fifth embodiment of the present application.
Fig. 5-2 is a view showing, in order from left to right, a spherical aberration diagram, an astigmatic diagram, and a distortion curve diagram of an optical imaging system according to a fifth embodiment of the present application.
Fig. 6-1 is a schematic structural view of an optical imaging system according to a sixth embodiment of the present application.
Fig. 6-2 is a view showing, in order from left to right, a spherical aberration diagram, an astigmatic diagram, and a distortion curve diagram of an optical imaging system according to a sixth embodiment of the present application.
Fig. 7 is a schematic structural diagram of an image capturing device according to an embodiment of the present application.
Fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" or "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1-1, 2-1, 3-1, 4-1, 5-1 and 6-1, the optical imaging system 100 according to the embodiment of the application is applicable to infrared band imaging, and can be applied to lenses of imaging devices such as computers, mobile phones, tablet computers, vehicles, monitoring, security, medical devices, game machines and robots, the optical imaging system 100 has seven lenses with refractive power, which are sequentially a first lens L1 with positive refractive power from an object side to an image side, an object side S1 is a convex surface at a paraxial region, and an image side S2 is a concave surface at a paraxial region; the second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region; the third lens element L3 with positive refractive power having an object-side surface S5 and an image-side surface S6; the fourth lens element L4 with refractive power having an object-side surface S7 and an image-side surface S8; the fifth lens element L5 with refractive power having an object-side surface S9 and an image-side surface S10, wherein the object-side surface S9 is concave at a paraxial region; the sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region; the seventh lens element L7 with negative refractive power has a concave object-side surface S13 at a paraxial region and a concave image-side surface S14 at a paraxial region; an imaging surface 130. Wherein the optical imaging system 100 satisfies the following conditional expression:
2.2<FNO*TTL/Imgh<2.3；
Wherein TTL is a distance between the object side surface S1 of the first lens element L1 and the imaging surface 130 of the optical imaging system 100 on the optical axis, imgh is half of an image height corresponding to a maximum field angle of the optical imaging system 100, and FNO is an f-number of the optical imaging system 100. That is, FNO TTL/Imgh can be any number between 2.2 and 2.3, for example: 2.21, 2.22, 2.23, 2.24, 2.25, 2.26, 2.27, 2.28, 2.29, etc.
When 2.2< FNO TTL/Imgh <2.3, the optical imaging system 100 can obtain larger relative aperture and larger image plane, and simultaneously the total size of the optical imaging system 100 is effectively reduced, so that the optical imaging system 100 can obtain more scene contents and enrich the imaging information of the system. The term "refractive power" in the present disclosure characterizes the ability of the optical imaging system 100 to deflect light.
Optionally, the seven lenses of the optical imaging system 100 are glass or plastic.
The combination of the first lens element L1 with positive refractive power and the second lens element L2 with negative refractive power is beneficial to correcting on-axis spherical aberration of the optical imaging system 100. The combination of the third lens element L3 with positive refractive power and the fourth lens element L4 with positive refractive power is beneficial to correcting astigmatism of the optical imaging system 100. The combination of the fifth lens element L5 with refractive power and the sixth lens element L6 with refractive power facilitates correcting coma aberration of the optical imaging system 100. The seventh lens element L7 with negative refractive power is advantageous for correcting curvature of field of the optical imaging system 100.
The first lens element L1 with a convex object-side surface S1 at a paraxial region thereof, the image-side surface S2 with a concave object-side surface at a paraxial region thereof, and the second lens element L2 with a convex object-side surface S3 with a concave object-side surface S4 with a concave object-side surface at a paraxial region thereof are beneficial to reducing the chief ray angle of the optical imaging system 100. The shapes of the fourth lens element L4 and the fifth lens element L5 are meniscus, so as to correct spherical aberration, astigmatism, curvature of field and distortion. The seventh lens element L7 has a concave image-side surface S14 at a paraxial region, which facilitates manufacturing of the optical imaging system 100.
In some embodiments, when the object-side surfaces and/or the image-side surfaces of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 are aspheric, the aspheric surfaces satisfy the following relationship:
Where Z is the distance from the corresponding point on the aspherical surface to the plane tangential to the vertex of the object or image side, r is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface (at the optical axis), k is the conic coefficient, ai is the i-th order aspherical coefficient of the object or image side.
Optionally, the optical imaging system 100 further comprises a diaphragm 110. Specifically, the diaphragm 110 may be located between the object side surface S1 of the first lens L1 and the object side surface S13 of the seventh lens L7. More specifically, the diaphragm 110 is located between the first lens L1 and the second lens L2, which is advantageous in expanding the angle of view of the optical imaging system 100. The diaphragm 110 may be located at any position between the object-side surface S1 of the first lens L1 and the object-side surface S13 of the seventh lens L7, and the position of the diaphragm 110 is not particularly limited.
Optionally, the optical imaging system 100 further comprises an infrared cut filter 120. The ir cut filter 120 is located between the seventh lens L7 and the imaging plane 130. The infrared cut filter 120 has a first face 121 and a second face 122. The ir cut filter 120 is made of glass, which can increase the transmittance of light in the infrared band, so that the optical imaging system 100 can be better applied to infrared imaging.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
1<DT1/DT2<1.2；
Wherein DT1 is the effective half-caliber of the image-side surface of the first lens element L1, and DT2 is the effective half-caliber of the image-side surface of the second lens element L2. That is, DT1/DT2 may be any value between 1 and 1.2, for example: 1.05, 1.1, 1.15, 1.18, etc. When 1< D1/DT 2<1.2, make the first lens L1 have great bore, can guarantee the angle maximize of incident light, and the second lens L2 bore is less, be favorable to gathering and gathering incident light, thereby make the optical imaging system 100 have the characteristics of large aperture, have bigger light inlet, can improve the dim light condition of shooting, be applicable to dark light environment shooting such as night scene, rainy day, sky, etc. and have better blurring effect, and then can improve the resolution ratio of optical imaging system 100 under the circumstances that realizes miniaturization, make optical imaging system 100 have better imaging effect.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
0.5<SAG61/CT6<0.8；
The SAG61 is an axial distance between an intersection point of the object side surface S11 of the sixth lens L6 and the optical axis and an apex of an effective radius of the object side surface S11 of the sixth lens L6, and the CT6 is a center thickness of the sixth lens L6 on the optical axis. That is, SAG61/CT6 may be any number between 0.5 and 0.8, for example: 0.55, 0.6, 0.65, 0.7, 0.75, etc. When 0.5< SAG61/CT6<0.8, the sensitivity of the sixth lens L6 is reduced, the lens is shaped, and engineering manufacture is realized better.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
5.0<MAX10/MIN10<7.0；
Wherein, MAX10 is the maximum distance between the image side S10 of the fifth lens element L5 and the object side S11 of the sixth lens element L6 in the optical axis direction, and MIN10 is the minimum distance between the image side S10 of the fifth lens element L5 and the object side S11 of the sixth lens element L6 in the optical axis direction. That is, MAX10/MIN10 may be any value between 5.0 and 7.0, such as: 5.2, 5.4, 5.6, 5.8, 6.0, 6.2, 6.4, 6.6, 6.8, etc. When 5.0< MAX10/MIN10<7.0, the lens can not be excessively bent, the local astigmatism can be effectively reduced, the overall sensitivity of the optical imaging system 100 can be reduced, and the engineering manufacture is facilitated.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
-1.5<R12/R13<-0.5；
Wherein R12 is a radius of curvature of the image side surface S12 of the sixth lens element L6 at the optical axis, and R13 is a radius of curvature of the object side surface S13 of the seventh lens element L7 at the optical axis. That is, R12/R13 may be any number between-1.5 and-0.5, for example: -1.45, -1.4, -1.35, -1.3, -1.25, -1.2, -1.15, -1.1, -1.0, etc. When-1.5 < R12/R13< -0.5 is satisfied, the aberration of the optical imaging system 100 can be effectively balanced, the sensitivity of the optical imaging system 100 is reduced, and the performance of the optical imaging system 100 is improved. If the above relation is not satisfied, the difference in surface shape between the sixth lens L6 and the seventh lens L7 is too large, and the sensitivity of the optical imaging system 100 increases, which is disadvantageous for engineering.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
0.5<ET6/CT6<0.7；
Wherein ET6 is the edge thickness of the sixth lens L6, and CT6 is the center thickness of the sixth lens L6 on the optical axis. That is, ET6/CT6 may be any value between 0.5 and 0.7, for example: 0.52, 0.54, 0.56, 0.58, 0.60, 0.62, 0.64, 0.66, 0.68, etc. The term "edge thickness" refers to the distance from the maximum effective aperture of the object side of the lens to the maximum effective aperture of the image side in the direction of the optical axis. When 0.5< ET6/CT6<0.7, the high-order aberration generated by the optical imaging system 100 can be effectively balanced, the field curvature adjustment in engineering manufacture is facilitated, and the imaging quality of the optical imaging system 100 is improved.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
0.3<|R5+R6|/|R5-R6|<1.5；
Wherein R5 is a radius of curvature of the object-side surface S5 of the third lens element L3 at the optical axis, and R6 is a radius of curvature of the image-side surface S6 of the third lens element L3 at the optical axis. That is, |r5+r6|/|r5-r6| can be any number between 0.3 and 1.5, for example: 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, etc. When 0.3< |r5+r6|/|r5-r6| <1.5, the spherical aberration contribution of the third lens L3 can be reasonably distributed, so that the on-axis area of the optical imaging system 100 has good imaging quality.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
0.2<|R4/f2|<0.4；
Wherein R4 is a radius of curvature of the image-side surface S4 of the second lens element L2 at the optical axis, and f2 is an effective focal length of the second lens element L2. That is, |r4/f2| can be any number between 0.2 and 0.4, for example: 0.22, 0.24, 0.26, 0.28, 0.30, 0.32, 0.34, 0.36, 0.38, etc. When 0.2< |r4/f2| <0.4, the astigmatism of the second lens L2 can be made to be in a reasonable range, and the astigmatism generated by the first lens L1 can be effectively balanced, so that the optical imaging system 100 has good imaging quality.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
-0.3<f/f4<0.01；
Wherein f4 is the effective focal length of the fourth lens L4, and f is the effective focal length of the whole system. That is, f/f4 may be any number between-0.3 and 0.01, for example: -0.25, -0.2, -0.15, -0.1, -0.05, -0.0, etc. When-0.3 < f/f4<0.01, the optical power of the fourth lens L4 is not excessively strong for the entire effective focal length of the optical imaging system 100, and advanced spherical aberration can be corrected, so that the optical imaging system 100 has good imaging quality.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
-0.5<f/f5<0.01；
Where f5 is the effective focal length of the fifth lens L5, and f is the effective focal length of the entire optical imaging system 100. That is, f/f5 may be any number between-0.5 and 0.01, for example: -0.45, -0.4, -0.35, -0.3, -0.25, -0.2, -0.15, -0.1, -0.05, 0.0, etc. When-0.5 < f/f5<0.01, the refraction of the light rays at the image side end of the optical imaging system 100 is facilitated, so that the chief ray angle of the optical imaging system 100 and the chief ray angle of the photosensitive element 200 can be better matched, and meanwhile, the high-grade coma aberration of the optical imaging system 100 can be corrected, so that the optical imaging system 100 has good imaging quality.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
-6<R9/f<-1.5；
Where R9 is a radius of curvature of the object side surface S9 of the fifth lens element L5 at the optical axis, and f is an effective focal length of the optical imaging system 100. That is, R9/f may be any number between-6 and-1.5, for example: -5.5, -5.0, -4.5, -4.0, -3.5, -3.0, -2.5, -2.0, etc. When-6 < R9/f < -1.5, the focal power of the fifth lens L5 can be in a reasonable range, and the spherical aberration of the system is effectively balanced, so that the optical imaging system 100 has good imaging quality.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
1.6<R12/f<1.9；
Where R12 is a radius of curvature of the image-side surface S12 of the sixth lens element L6 at the optical axis, and f is an effective focal length of the optical imaging system 100. That is, R12/f may be any number between 1.6 and 1.9, for example: 1.65, 1.7, 1.75, 1.8, 1.85, etc. When 1.6< R12/f <1.9, the focal power of the sixth lens L6 can be in a reasonable range, and the astigmatism and distortion of the system can be effectively balanced, so that the system has good imaging quality.
In some embodiments, the optical imaging system 100 satisfies the following conditional expression:
-1.7<R13/f<-1.3；
Wherein R13 is a radius of curvature of the object side surface S13 of the seventh lens L7 at the optical axis, and f is an effective focal length of the optical imaging system 100. That is, R13/f may be any number between-1.7 and-1.3, for example: -1.65, -1.60, -1.55, -1.50, -1.45, -1.4, -1.35, etc. When-1.7 < R13/f < -1.3, the focal power of the seventh lens L7 can be in a reasonable range, so that the deflection angle of the marginal view field light rays entering the photosensitive element 200 is effectively reduced, the matching degree of the optical imaging system 100 and the photosensitive element 200 is increased, the off-axis view field astigmatism is improved, and the overall image quality is improved.
The optical imaging system 100 of the present application is described in further detail below in connection with specific embodiments.
First embodiment
Referring to fig. 1-1 and fig. 1-2, fig. 1-1 is a schematic structural diagram of an optical imaging system according to a first embodiment, and fig. 1-2 is a spherical aberration diagram, an astigmatic diagram, and a distortion chart of the first embodiment of the present application when the first embodiment is sequentially from left to right. As can be seen from fig. 1 to 1, the optical imaging system 100 of the present embodiment includes, in order from the object to the image side, a diaphragm 110, and
The first lens element L1 with positive refractive power has a convex object-side surface S1 at a paraxial region and a concave image-side surface S2 at a paraxial region.
The second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a convex image-side surface S6 at a paraxial region.
The fourth lens element L4 with negative refractive power has a convex object-side surface S7 at a paraxial region and a concave image-side surface S8 at a paraxial region.
The fifth lens element L5 with negative refractive power has a concave object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region.
The sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region.
The seventh lens element L7 with negative refractive power has a concave object-side surface S13 at a paraxial region and a concave image-side surface S14 at a paraxial region.
An infrared cut filter 120 and an imaging surface 130.
In the present embodiment, the optical imaging system 100 satisfies the conditions of the following tables 1 and 2.
Table 1 is detailed structural data of the first embodiment, in which Y radius, thickness, and effective focal length are in millimeters (mm), and surfaces S1 to S14 represent surfaces from the object side to the image side in order. Specifically, the radius Y in table 1 refers to the radius of curvature of the lens at the optical axis in the optical imaging system 100. The Y radius at the object side of the lens represents the radius of curvature of the object side of the lens at the optical axis, and the Y radius at the image side of the lens represents the radius of curvature of the image side of the lens at the optical axis. The thickness refers to the thickness of the lens on the optical axis in the optical imaging system 100. Table 2 shows aspherical data of the first embodiment, wherein K is a conic coefficient of each face, and A4-a20 are aspherical coefficients of 4 th-20 th order of each face.
Fig. 1-1 is a schematic diagram of an optical imaging system 100 in a first embodiment. The spherical aberration diagrams shown in fig. 1-2 are color difference curves of the optical imaging system 100 in the first embodiment, which represent the focus deviation of light rays with different wavelengths after passing through the optical imaging system 100. The astigmatism diagrams shown in fig. 1-2 are astigmatic curves of the optical imaging system 100 in the first embodiment, which represent meridional image plane curvature and sagittal image plane curvature. The distortion graphs shown in fig. 1-2 are distortion curves of the optical imaging system 100 in the first embodiment, which represent distortion magnitude values corresponding to different image heights.
As can be seen from fig. 1-1 and fig. 1-2, the optical imaging system 100 of the present application has a better imaging effect in the case of miniaturization. In addition, the following tables of the embodiments are schematic diagrams corresponding to the embodiments, and the definition of data in the tables is the same as that of the first embodiment, and is not repeated herein.
Second embodiment
Referring to fig. 2-1 and fig. 2-2, fig. 2-1 is a schematic structural diagram of an optical imaging system according to a second embodiment, and fig. 2-2 is a spherical aberration diagram, an astigmatic diagram, and a distortion chart of the second embodiment of the present application when the first embodiment is sequentially from left to right. As can be seen from fig. 2-1, the optical imaging system 100 of the present embodiment includes, in order from the object side, a diaphragm 110 and
The first lens element L1 with positive refractive power has a convex object-side surface S1 at a paraxial region and a concave image-side surface S2 at a paraxial region.
The second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a convex image-side surface S6 at a paraxial region.
The fourth lens element L4 with negative refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region.
The fifth lens element L5 with negative refractive power has a concave object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region.
The sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region.
The seventh lens element L7 with negative refractive power has a concave object-side surface S13 at a paraxial region and a concave image-side surface S14 at a paraxial region.
An infrared cut filter 120 and an imaging surface 130.
In the present embodiment, the optical imaging system 100 satisfies the conditions of the following tables 3 and 4.
Table 4 shows aspherical data of the second embodiment, where K is a conic coefficient of each face, and A4-a20 are aspherical coefficients of 4 th-20 th order of each face.
As can be seen from fig. 2-1 and fig. 2-2, the optical imaging system 100 of the present application has a better imaging effect in the case of miniaturization.
Third embodiment
Referring to fig. 3-1 and fig. 3-2, fig. 3-1 is a schematic structural diagram of an optical imaging system according to a third embodiment, and fig. 3-2 is a spherical aberration diagram, an astigmatic diagram, and a distortion chart of the third embodiment of the present application when the third embodiment is sequentially from left to right. As can be seen from fig. 3-1, the optical imaging system 100 of the present embodiment includes, in order from the object side, a diaphragm 110 and
The first lens element L1 with positive refractive power has a convex object-side surface S1 at a paraxial region and a concave image-side surface S2 at a paraxial region.
The second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a convex image-side surface S6 at a paraxial region.
The fourth lens element L4 with negative refractive power has a concave object-side surface S7 at a paraxial region and a concave image-side surface S8 at a paraxial region.
The fifth lens element L5 with positive refractive power has a concave object-side surface S9 at a paraxial region and a convex image-side surface S10 at a paraxial region.
The sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region.
The seventh lens element L7 with negative refractive power has a concave object-side surface S13 at a paraxial region and a concave image-side surface S14 at a paraxial region.
An infrared cut filter 120 and an imaging surface 130.
In the present embodiment, the optical imaging system 100 satisfies the conditions of the following tables 5 and 6.
Table 6 shows aspherical data of the third embodiment, in which K is a conic coefficient of each face, and A4-a20 are aspherical coefficients of 4 th-20 th order of each face.
As can be seen from fig. 3-1 and 3-2, the optical imaging system 100 of the present application has a better imaging effect in a miniaturized manner.
Fourth embodiment
Referring to fig. 4-1 and fig. 4-2, fig. 4-1 is a schematic structural diagram of an optical imaging system according to a fourth embodiment, and fig. 4-2 is a spherical aberration diagram, an astigmatic diagram, and a distortion chart of the fourth embodiment of the present application when the fourth embodiment is sequentially from left to right. As can be seen from fig. 4-1, the optical imaging system 100 of the present embodiment includes, in order from the object side, a diaphragm 110 and
The first lens element L1 with positive refractive power has a convex object-side surface S1 at a paraxial region and a concave image-side surface S2 at a paraxial region.
The second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region.
The fourth lens element L4 with positive refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region.
The fifth lens element L5 with negative refractive power has a concave object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region.
The sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region.
The seventh lens element L7 with negative refractive power has a concave object-side surface S13 at a paraxial region and a concave image-side surface S14 at a paraxial region.
An infrared cut filter 120 and an imaging surface 130.
In the present embodiment, the optical imaging system 100 satisfies the following conditions of table 7 and table 8.
Table 8 shows aspherical data of the fourth embodiment, in which K is a conic coefficient of each face, and A4-a20 are aspherical coefficients of 4 th-20 th order of each face.
As can be seen from fig. 4-1 and fig. 4-2, the optical imaging system 100 of the present application has a better imaging effect in a miniaturized manner.
Fifth embodiment
Referring to fig. 5-1 and fig. 5-2, fig. 5-1 is a schematic structural diagram of an optical imaging system according to a fifth embodiment, and fig. 5-2 is a spherical aberration diagram, an astigmatic diagram, and a distortion chart of the fifth embodiment of the present application when the optical imaging system is sequentially arranged from left to right. As can be seen from fig. 5-1, the optical imaging system 100 of the present embodiment includes, in order from the object side, a diaphragm 110 and
The first lens element L1 with positive refractive power has a convex object-side surface S1 at a paraxial region and a concave image-side surface S2 at a paraxial region.
The second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a convex image-side surface S6 at a paraxial region.
The fourth lens element L4 with negative refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region.
The fifth lens element L5 with negative refractive power has a concave object-side surface S9 at a paraxial region and a convex image-side surface S10 at a paraxial region.
The sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region.
The seventh lens element L7 with negative refractive power has a concave object-side surface S13 at a paraxial region and a concave image-side surface S14 at a paraxial region.
An infrared cut filter 120 and an imaging surface 130.
In the present embodiment, the optical imaging system 100 satisfies the following conditions of table 9 and table 10.
Table 10 is aspherical data of the fifth embodiment, where K is a conic coefficient of each face, and A4-a20 are aspherical coefficients of 4 th-20 th order of each face.
As can be seen from fig. 5-1 and fig. 5-2, the optical imaging system 100 of the present application has a better imaging effect in a miniaturized manner.
Sixth embodiment
Referring to fig. 6-1 and fig. 6-2, fig. 6-1 is a schematic structural diagram of an optical imaging system according to a sixth embodiment, and fig. 6-2 is a spherical aberration diagram, an astigmatic diagram, and a distortion chart according to a sixth embodiment of the present application when the optical imaging system is sequentially arranged from left to right. As can be seen from fig. 6-1, the optical imaging system 100 of the present embodiment includes, in order from the object side, a diaphragm 110 and
The first lens element L1 with positive refractive power has a convex object-side surface S1 at a paraxial region and a concave image-side surface S2 at a paraxial region.
The second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has a concave object-side surface S5 at a paraxial region and a convex image-side surface S6 at a paraxial region.
The fourth lens element L4 with negative refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region.
The fifth lens element L5 with negative refractive power has a concave object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region.
The sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region.
The seventh lens element L7 with negative refractive power has a concave object-side surface S13 at a paraxial region and a concave image-side surface S14 at a paraxial region.
An infrared cut filter 120 and an imaging surface 130.
In the present embodiment, the optical imaging system 100 satisfies the following conditions of table 11 and table 12.
Table 12 shows aspherical data of the sixth embodiment, in which K is a conic coefficient of each face, and A4-a20 are aspherical coefficients of 4 th-20 th order of each face.
As can be seen from fig. 6-1 and fig. 6-2, the optical imaging system 100 of the present application has a better imaging effect in the case of miniaturization.
In summary, the first to sixth embodiments satisfy the relationships described in table 13, respectively.
Referring to fig. 7, the image capturing device 10 further includes the optical imaging system 100 and the photosensitive element 200. The photosensitive element 200 is located on the image side of the optical imaging system 100.
The photosensitive element 200 of the present application may be a photosensitive coupling element (Charge Coupled Device, CCD) or a complementary metal oxide semiconductor element (Complementary Metal-Oxide Semiconductor Sensor, CMOS sensor).
The image capturing device 10 of the present application has a large light incoming amount and a high imaging effect while ensuring miniaturization.
Reference is made to the above description for other features of the image capturing device 10, and the description is omitted herein.
Referring to fig. 8, the present application further provides an electronic device 1, which includes a device main body 20 and the image capturing apparatus 10 of the present application. The orientation means is mounted on the apparatus body 20.
The electronic apparatus 1 of the present application includes, but is not limited to, a car-mounted camera, a computer, a notebook computer, a tablet computer, a mobile phone, a camera, a smart band, a smart watch, smart glasses, an electronic book reader, a portable multimedia player, an ambulatory medical device, and the like.
The camera of the electronic equipment 1 has larger light incoming quantity and higher imaging effect, and is beneficial to improving the shooting effect of the electronic equipment 1.
While embodiments of the present application have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and alternatives to the above embodiments may be made by those skilled in the art within the scope of the application, which is also to be regarded as being within the scope of the application.
Claims (8)
1. An optical imaging system, characterized in that there are seven lens elements with refractive power, and the optical imaging system sequentially comprises, from an object side to an image side:
The first lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
The second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
A third lens element with positive refractive power;
A fourth lens element with refractive power;
The fifth lens element with refractive power has a concave object-side surface at a paraxial region;
The sixth lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; and
The seventh lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
The fourth lens and the fifth lens have different refractive powers and are positive;
Wherein the optical imaging system satisfies the following conditional expression:
2.2<FNO*TTL/Imgh<2.3；
0.5<SAG61/CT6<0.8；
0.5<ET6/CT6<0.7；
0.3<|R5+R6|/|R5-R6|<1.5；
Wherein FNO is an f-number of the optical imaging system, TTL is a distance from an object side surface of the first lens to an imaging surface on an optical axis, imgh is a half of an image height corresponding to a maximum field angle of the optical imaging system, SAG61 is an axial distance between an intersection point of the object side surface of the sixth lens and the optical axis and an effective radius vertex of the object side surface of the sixth lens, CT6 is a center thickness of the sixth lens on the optical axis, ET6 is an edge thickness of the sixth lens, R5 is a radius of curvature of the object side surface of the third lens at the optical axis, and R6 is a radius of curvature of the image side surface of the third lens at the optical axis.
2. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
1<DT1/DT2<1.2；
wherein DT1 is the effective half-caliber of the image side of the first lens and DT2 is the effective half-caliber of the image side of the second lens.
3. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
5.0<MAX10/MIN10<7.0；
Wherein, MAX10 is the maximum distance between the image side surface of the fifth lens and the object side surface of the sixth lens in the optical axis direction, and MIN10 is the minimum distance between the image side surface of the fifth lens and the object side surface of the sixth lens in the optical axis direction.
4. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
-1.5<R12/R13<-0.5；
Wherein R12 is a radius of curvature of the image side surface of the sixth lens element at the optical axis, and R13 is a radius of curvature of the object side surface of the seventh lens element at the optical axis.
5. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
0.2< |r4/f2| <0.4, and/or-6 < R9/f < -1.5, and/or 1.6< R12/f <1.9, and/or-1.7 < R13/f < -1.3;
Wherein R4 is a radius of curvature of the image side surface of the second lens element at the optical axis, R9 is a radius of curvature of the object side surface of the fifth lens element at the optical axis, R12 is a radius of curvature of the image side surface of the sixth lens element at the optical axis, R13 is a radius of curvature of the object side surface of the seventh lens element at the optical axis, f2 is an effective focal length of the second lens element, and f is an effective focal length of the optical imaging system.
6. The optical imaging system according to any one of claims 1 to 5, wherein the optical imaging system satisfies the following conditional expression:
-0.3< f/f4<0.01, and/or-0.5 < f/f5<0.01;
wherein f4 is an effective focal length of the fourth lens, f5 is an effective focal length of the fifth lens, and f is an effective focal length of the optical imaging system.
7. An image capturing device is characterized in that, the image capturing device includes:
the optical imaging system of any of claims 1-6; and
And the photosensitive element is positioned on the image side of the optical imaging system.
8. An electronic device, the electronic device comprising:
An apparatus main body; and
The image capturing apparatus according to claim 7, the image capturing apparatus being mounted on the apparatus main body.
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