CN111830682A - Optical imaging system, image capturing module, electronic device and carrier - Google Patents
Optical imaging system, image capturing module, electronic device and carrier Download PDFInfo
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- CN111830682A CN111830682A CN202010796195.0A CN202010796195A CN111830682A CN 111830682 A CN111830682 A CN 111830682A CN 202010796195 A CN202010796195 A CN 202010796195A CN 111830682 A CN111830682 A CN 111830682A
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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
Abstract
The present application provides an optical imaging system, sequentially comprising from an object side to an image side: the first lens group with negative bending force, the surface of the first lens group closest to the image side is a concave surface; the second lens group with positive bending force, the surfaces of the second lens group closest to the object side and the image side are convex surfaces; the third lens group with positive bending force, the surfaces of the third lens group closest to the object side and the image side are convex surfaces; the optical imaging system further comprises a diaphragm, and the diaphragm is arranged on the object side of the third lens group. The optical imaging system meets the requirement of the system on ultra-wide angle imaging through reasonable tortuosity configuration, and ensures the definition of imaging effect while reducing the size of the ultra-wide angle lens. The application also provides an image capturing module with the optical imaging system, an electronic device with the image capturing module and a carrier.
Description
Technical Field
The present invention relates to the field of optical imaging technologies, and in particular, to an optical imaging system, an image capturing module, an electronic device, and a carrier.
Background
At present, in the 3C electronic product and the automobile field of making a video recording, the consumer has all proposed higher requirement to the imaging quality and the volume size of making a video recording the module. On a cell phone, consumers want to get a larger field of view without occupying a larger volume. In the field of automobiles, requirements on road traffic safety and automobile safety are continuously improved, and vehicle-mounted lenses are increasingly applied to automobile auxiliary driving systems due to the rise of looking around cameras, driving auxiliary systems and unmanned driving markets. Meanwhile, people also put forward higher requirements on the aspects of the imaging quality of the camera module, the comfort level of the picture and the like.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: the existing ultra-wide-angle camera lens is difficult to simultaneously meet the shooting and clear imaging in a large angle range, so that the image is difficult to be accurately shot in real time. In order to obtain a larger field angle, the wide-angle lens is often assembled by matching a plurality of lenses, so that the size of the wide-angle lens is generally larger.
Disclosure of Invention
In view of the above, it is desirable to provide an optical imaging system, and an image capturing module, an electronic device and a carrier having the optical imaging system, so as to solve the above problems.
An embodiment of the present application provides an optical imaging system, sequentially from an object side to an image side, comprising:
the first lens group with negative bending force, the surface of the first lens group closest to the image side is a concave surface;
the second lens group with positive bending force, the surfaces of the second lens group closest to the object side and the image side are convex surfaces;
the third lens group with positive bending force, the surfaces of the third lens group closest to the object side and the image side are convex surfaces;
the optical imaging system further comprises a diaphragm, and the diaphragm is arranged on the object side of the third lens group.
In the optical imaging system of the embodiment of the application, the requirement of the optical imaging system on ultra-wide angle imaging is met through reasonable bending force configuration of the first lens group, the second lens group and the third lens group. The arrangement of the diaphragm is used for reducing stray light, and the improvement of image quality is facilitated. The optical imaging system reduces the size of the ultra-wide-angle lens and ensures the definition of the imaging effect.
In some embodiments, the first lens group is composed of a first lens having a negative refracting power and a second lens having a negative refracting power;
the second lens group is composed of a third lens having positive bending power;
the third lens group consists of a fourth lens with negative bending force and a fifth lens with positive bending force, wherein the fourth lens and the fifth lens are of a glued structure, and the glued surfaces of the fourth lens and the fifth lens are convex to the object side of the optical imaging system at the optical axis;
the optical imaging system satisfies the following conditional expression:
-6.5<(f1-f2)/f<-4；
wherein f1 and f2 are focal lengths of the first lens and the second lens, respectively, and f is a focal length of the optical imaging system.
The five-piece lens can better realize an ultra-wide-angle imaging effect, can correct aberration and avoid distortion of an imaging picture; and by satisfying the limitation of the conditional expression, the bending forces of the first lens and the second lens are reasonably distributed in the optical imaging system, which is beneficial to inhibiting high-order aberration, chromatic aberration and the like caused by peripheral beams of the imaging area, thereby improving the resolution performance of the optical imaging system.
In some embodiments, the optical imaging system satisfies the following conditional expression:
16<TTL/f<17；
wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical imaging system, and f is a focal length of the optical imaging system.
By limiting the relation between the total optical length of the optical imaging system and the focal length of the optical imaging system, the total optical length of the optical imaging system is controlled while the field angle range of the optical imaging system is met, and the characteristic of miniaturization of the optical imaging system is met. The total length of the optical imaging system is too long above the upper limit of the conditional expression, which is not beneficial to miniaturization; if the focal length of the optical imaging system is too long below the lower limit of the conditional expression, the field angle range of the optical imaging system is not satisfied, and sufficient object space information cannot be obtained.
In some embodiments, the optical imaging system satisfies the following conditional expression:
2<d12/f<4；
wherein d12 is an air space on an optical axis between an image side surface of the first lens and an object side surface of the second lens, and f is a focal length of the optical imaging system.
Through satisfying the upper limit of conditional expression, can make first lens rationally diverge incident beam to better cooperate with follow-up lens, well completion is to the correction of aberration. By satisfying the lower limit of the conditional expression, the light beam is sufficiently diverged to enter the second lens, and therefore an optical imaging system having a strong bending force is easily achieved, and the off-axis aberration of the system is further corrected. In addition, the air space between the first lens and the second lens is limited, so that the optical imaging system is beneficial to realizing the characteristics of compact structure, miniaturization and the like.
In some embodiments, the optical imaging system satisfies the following conditional expression:
-62<R3/R4<-20；
wherein R3 is a radius of curvature at the object side paraxial axis of the second lens, and R4 is a radius of curvature at the image side paraxial axis of the second lens.
Through reasonable matching of the curvature radius relation of the object side surface and the image side surface of the second lens, the object side surface is set as a negative lens to provide negative bending force for the system; the light rays emitted into the system at a large angle can be controlled, and the field angle range of the optical imaging system is enlarged; the curvature radius of the object side surface of the second lens is controlled through a conditional expression, so that the generation probability of a ghost is reduced, and the intensity of the ghost is weakened; the size of R3 can affect the bending degree of the lens and the processing difficulty of the lens, R3 is too small, the bending degree of the lens affects the processing of the lens, and the larger R3 is, the flatter the surface of the lens is, and other components similar to the plane are easy to generate ghost images.
In some embodiments, the optical imaging system satisfies the following conditional expression:
3<f3/f<4；
wherein f3 is the focal length of the third lens, and f is the focal length of the optical imaging system.
The positive bending force can be ensured by satisfying the conditional expression, and the light rays diverged by the first lens and the second lens under the strong negative bending force can be converged; further, the burden of the converging action of the fourth lens and the fifth lens can be reduced, and it is not necessary to obtain a strong bending force, so that the degree of freedom of design can be secured. Since the positive bending force does not become excessively strong by satisfying the lower limit of the conditional expression, the angle between the normal of each of the object side and image side surfaces of the third lens element and the incident light ray does not become excessively large, and the occurrence of high-order aberration is easily suppressed.
In some embodiments, the optical imaging system satisfies the following conditional expression:
3<(R5-R6)/(R5+R6)<8；
wherein R5 is a radius of curvature at a paraxial axis of an object side surface of the third lens, and R6 is a radius of curvature at a paraxial axis of an image side surface of the third lens.
By satisfying the conditional expression lower limit, the angle of the principal ray incident image plane at the peripheral view angle is easily reduced. The upper limit of the conditional expression is easy to inhibit the generation of astigmatism, reduce the risk of ghost image generation and improve the resolution capability of the system.
In some embodiments, the optical imaging system satisfies the following conditional expression:
0.5<R5/CT3<2；
wherein R5 is a curvature radius of an object side surface of the third lens at a position close to an optical axis, and CT3 is a central thickness of the third lens on the optical axis.
The third lens is of a biconvex structure, can converge light rays in one step, is smooth in surface shape, and can reduce the deviation of incident angles and emergent angles of the light rays with different fields of view, thereby reducing the sensitivity; the processing difficulty can be reduced and the thickness tolerance sensitivity can be reduced by arranging the thicker third lens, and the yield is improved.
In some embodiments, the optical imaging system satisfies the following conditional expression:
0.5<f45/f123<2；
wherein f45 is a combined focal length of the fourth lens and the fifth lens, and f123 is a combined focal length of the first lens, the second lens, and the third lens.
If the positive bending force of the f123 and the f45 is too large or too small when the positive bending force exceeds the range of the relational expression, the whole optical imaging system can show the condition of too large local bending force, and the effect of thermal expansion and cold contraction of the back focal length of the optical imaging system is caused (namely, the back focal length of the lens can be shortened under the high-temperature condition, and the back focal length of the lens can become inconsistent with the use condition of the optical imaging system under the low-temperature condition), so that the imaging definition of the optical imaging system in the temperature range of-40 ℃ to +85 ℃ is influenced.
In some embodiments, the optical imaging system satisfies the following conditional expression:
(CT4-CT5)/(α4-α5)<0；
wherein CT4 and CT5 are central thicknesses of the fourth lens and the fifth lens on an optical axis, respectively, α 4 and α 5 are coefficients of thermal expansion of the fourth lens and the fifth lens, respectively, and a unit of the coefficient of thermal expansion is 10-5/℃。
The fourth lens and the fifth lens are glued, and degumming and cracking caused by overlarge thermal expansion difference of the fourth lens and the fifth lens are avoided by setting parameters meeting the relational expression; the method is favorable for improving the temperature sensitivity of the optical imaging system and ensures that the optical imaging system can show excellent imaging quality and higher resolving power in high and low temperature environments.
In some embodiments, the optical imaging system satisfies the following conditional expression:
4<(CT3+d34)/f<5；
wherein CT3 is a central thickness of the third lens element on an optical axis, d34 is an air space between an image-side surface of the third lens element and an object-side surface of the fourth lens element on the optical axis, and f is a focal length of the optical imaging system.
By meeting the upper limit of the conditional expression, the thickness of the third lens and/or the air space between the third lens and the fourth lens on the optical axis can be avoided to be too large, thereby being beneficial to realizing the miniaturization of the system; by meeting the lower limit of the conditional expression, the central thickness of the third lens and/or the air interval distance between the third lens and the fourth lens on the optical axis is increased on the premise of meeting the optical performance of the system, so that the correction of the aberration of the system is facilitated, and the imaging quality of the system is improved.
The embodiment of the invention provides an image capturing module, which comprises the optical imaging system in any embodiment; and the photosensitive element is arranged on the image side of the optical imaging system.
The image capturing module comprises an optical imaging system, and the optical imaging system reasonably configures the bending force of the internal lens, so that the requirement of the image capturing module on ultra-wide-angle imaging is met. The image capturing module reduces the size of the ultra-wide-angle lens and ensures the definition of the imaging effect.
An embodiment of the present invention provides an electronic device, including: the casing with the module of getting for instance of above-mentioned embodiment, get for instance the module and install on the casing.
The electronic device comprises the image capturing module, and through reasonable configuration of the bending force, the imaging quality of the optical imaging system can be improved, the aberration can be corrected, and the overall volume of the optical imaging system can be reduced.
An embodiment of the present invention provides a carrier, including: the image capturing module comprises a body and the image capturing module of the embodiment, wherein the image capturing module is arranged on the body.
The carrier comprises the image capturing module, and the imaging quality of the optical imaging system can be improved, the aberration can be corrected, and the overall volume of the optical imaging system can be reduced.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of an optical imaging system according to a first embodiment of the present invention.
Fig. 2 is a schematic view of spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical imaging system in the first embodiment of the present invention.
Fig. 3 is a schematic structural view of an optical imaging system according to a second embodiment of the present invention.
Fig. 4 is a schematic view of spherical aberration (mm), astigmatism (mm), and distortion (%) of an optical imaging system in a second embodiment of the present invention.
Fig. 5 is a schematic structural view of an optical imaging system according to a third embodiment of the present invention.
Fig. 6 is a schematic view of spherical aberration (mm), astigmatism (mm), and distortion (%) of an optical imaging system in a third embodiment of the present invention.
Fig. 7 is a schematic structural view of an optical imaging system according to a fourth embodiment of the present invention.
Fig. 8 is a schematic view of spherical aberration (mm), astigmatism (mm), and distortion (%) of an optical imaging system in a fourth embodiment of the present invention.
Fig. 9 is a schematic structural view of an optical imaging system according to a fifth embodiment of the present invention.
Fig. 10 is a schematic view of spherical aberration (mm), astigmatism (mm), and distortion (%) of an optical imaging system in a fifth embodiment of the present invention.
Fig. 11 is a schematic structural diagram of an image capturing module according to an embodiment of the invention.
Fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the invention.
Fig. 13 is a schematic structural diagram of a carrier according to an embodiment of the invention.
Description of the main elements
First lens L1
Second lens L2
Third lens L3
Fourth lens L4
Fifth lens L5
Optical filter L6
Cover glass L7
Stop STO
Object sides S1, S3, S5, S7, S9, S11, S13
Like sides S2, S4, S6, S8, S10, S12, S14
Image plane S15
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Referring to fig. 1, an optical imaging system 10 according to an embodiment of the present invention includes, in order from an object side to an image side: a first lens group 12 with negative bending force, wherein the surface of the first lens group 12 closest to the image side is a concave surface; a second lens group 14 with positive bending force, wherein the surfaces of the second lens group 14 closest to the object side and the image side are convex surfaces; and the surfaces of the third lens group 16 closest to the object side and the image side are convex surfaces with positive bending force.
Further, the optical imaging system 10 further includes a stop STO disposed on the object side of the third lens group 16, specifically, the stop STO is disposed on the object side of the first lens group 12, or between the first lens group 12 and the second lens group 14, or between the second lens group 14 and the third lens group 16.
In the optical imaging system 10 of the embodiment of the present application, the requirement of the optical imaging system 10 for ultra-wide angle imaging is satisfied by the reasonable bending force configuration of the first lens group 12, the second lens group 14, and the third lens group 16. The stop STO is provided to reduce stray light, which is helpful to improve image quality. The optical imaging system 10 ensures the definition of the imaging effect while reducing the size of the ultra-wide angle lens.
In some embodiments, the first lens group 12 is composed of a first lens L1 having a negative refracting power and a second lens L2 having a negative refracting power; the second lens group 14 is composed of a third lens L3 having a positive refracting power; the third lens group 16 is composed of a fourth lens L4 with negative bending force and a fifth lens L5 with positive bending force, wherein the fourth lens L4 and the fifth lens L5 are of a cemented structure, and cemented surfaces of the fourth lens L4 and the fifth lens L5 are convex to the object side of the optical imaging system 10 at the optical axis.
It can be understood that the five-piece lens can better realize the ultra-wide angle imaging effect, can correct aberration, and avoids the imaging picture from being distorted.
Further, the first lens L1 has an object-side surface S1 and an image-side surface S2, the second lens L2 has an object-side surface S3 and an image-side surface S4, the third lens L3 has an object-side surface S5 and an image-side surface S6, the fourth lens L4 has an object-side surface S7 and an image-side surface S8, and the fifth lens L5 has an object-side surface S9 and an image-side surface S10. The image-side surface S8 of the fourth lens element L4 and the object-side surface S9 of the fifth lens element L5 are bonded.
In some embodiments, the object-side surface S1 of the first lens element L1 is convex and the image-side surface S2 is concave; the object-side surface S3 of the second lens element L2 is concave along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is convex along the optical axis, and the image-side surface S8 is concave along the optical axis; the object-side surface S9 and the optical axis of the fifth lens element L5 are convex, and the image-side surface S10 and the optical axis are convex.
The optical imaging system 10 has a wide field of view by reasonable lens arrangement, and the size of the optical imaging system 10 is reduced while maintaining good optical performance, thereby realizing miniaturization of the optical imaging system 10.
In some embodiments, a stop STO is disposed between the third lens L3 and the fourth lens L4, thereby providing a possibility for realization of a large angle of view. Moreover, the central stop STO makes the structure of the optical imaging system 10 in a certain symmetry, so that the optical distortion is well controlled.
In some embodiments, optical imaging system 10 further includes a filter L6, filter L6 having an object side S11 and an image side S12. The optical filter L6 is disposed on the image side of the fifth lens element L5 to filter out light rays in other wavelength bands such as invisible light, for example, infrared light, and only allow visible light to pass through, so that the optical imaging system 10 can be clearer during imaging and avoid interference.
In some embodiments, optical imaging system 10 further includes a cover glass L7, cover glass L7 having an object side S13 and an image side S14. The cover glass L7 is provided between the image side surface S12 and the image surface S15 of the filter L6. The protective glass L7 is completely transparent and light can directly pass through, and the protective glass L7 is used to protect photosensitive elements and the like outside the optical imaging system 10.
When the optical imaging system 10 is used for imaging, light rays emitted or reflected by a subject enter the optical imaging system 10 from the object side direction, pass through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the optical filter L6 and the protective glass L7 in sequence, and finally converge on the image plane S15.
In some embodiments, the first lens L1 and the filter L6 are made of glass, and the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are made of plastic.
In some embodiments, the first lens L1 is a spherical mirror, and the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all aspheric mirrors.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
16<TTL/f<17；
wherein, TTL is a distance on the optical axis from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical imaging system 10, and f is a focal length of the optical imaging system 10, that is, TTL/f can be any value in (16, 17), for example: 16.1, 16.25, 16.5, 16.7, 16.9, etc.
By satisfying the limitation of the conditional expression, the relationship between the optical total length of the optical imaging system 10 along the optical axis and the focal length of the optical imaging system 10 is determined, and the optical total length of the optical imaging system 10 is controlled while satisfying the field angle range of the optical imaging system 10, thereby realizing the characteristic of miniaturization of the optical imaging system 10. When the TTL/f is higher than the conditional upper limit, the total length of the optical imaging system 10 is too long, which is not favorable for realizing miniaturization; when TTL/f is lower than the lower limit of the conditional expression, the focal length of the optical imaging system 10 is too long, which is not favorable for satisfying the field angle range of the optical imaging system 10, and sufficient object space information cannot be obtained.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
-6.5<(f1-f2)/f<-4；
where f1 and f2 are focal lengths of the first lens L1 and the second lens L2, respectively, and f is a focal length of the optical imaging system 10, that is, (f1-f2)/f can be any value within (-6.5, -4), for example, the value is: -6.4, -6, -5, -4.5, -4.1, etc.
By satisfying the limitation of the conditional expression, the bending forces of the first lens L1 and the second lens L2 are reasonably distributed in the optical imaging system, which is beneficial to inhibiting high-order aberration, chromatic aberration and the like caused by peripheral light beams of an imaging area, thereby improving the resolution performance of the optical imaging system. When (f1-f2)/f exceeds the limit of the conditional expression, the peripheral beams of the imaging area are easy to cause high-order aberration, and further chromatic aberration occurs during imaging, and the definition and the chromatic aberration of the imaging effect are affected.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
2<d12/f<4；
where d12 is an air space on the optical axis between the image-side surface S2 of the first lens element L1 and the object-side surface S3 of the second lens element L2, and f is a focal length of the optical imaging system 10, that is, d12/f can be any value in the range of (2, 4), for example: 2.1, 2.5, 3, 3.5, 3.9, etc.
The first lens L1 can reasonably diverge the incident beam by satisfying the limitation of the conditional expression, so that the incident beam can be better matched with the subsequent lens to well finish the correction of aberration, and the beam can be fully diverged to enter the second lens L2, so that the optical imaging system 10 with stronger bending force can be easily achieved, and the off-axis aberration of the system can be further corrected. In addition, the first lens L1 and the second lens L2 are limited by the air space, which is beneficial to the optical imaging system to realize the characteristics of compact structure, miniaturization and the like. When d12/f is higher than the upper limit of the conditional expression, the air space between the first lens L1 and the second lens L2 on the optical axis is too large, which is not favorable for improving the assembly yield and is easy to generate stray light; meanwhile, the excessively large air gap arrangement increases the overall length of the optical imaging system 10, which is disadvantageous for the system to be miniaturized. When d12/f is lower than the lower limit of the conditional expression, the air gap between the first lens L1 and the second lens L2 on the optical axis is too small, which is not favorable for the light beam to be fully diverged after being refracted by the first lens L1 and enter the second lens L2, and is not favorable for correcting the aberration of the optical imaging system 10, thereby affecting the imaging quality.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
-62<R3/R4<-20；
wherein R3 is the radius of curvature of the object-side surface S3 of the second lens element L2 at the paraxial region thereof, and R4 is the radius of curvature of the image-side surface S4 of the second lens element L2 at the paraxial region thereof, that is, R3/R4 can be any value within (-62, -20), for example: -60, -50, -40, -30, -21, etc.
Through reasonable matching of the curvature radius relationship between the object side surface S3 and the image side surface S4 of the second lens L2, the object side surface of the second lens L2 is set as a negative lens, so that negative bending force is provided for the system; the light rays entering the system at large angles can be controlled, and the field angle range of the optical imaging system 10 is expanded. By satisfying the limitation of the conditional expression, the curvature radius of the object side surface S3 of the second lens L2 is controlled, which is beneficial to reducing the generation probability of the ghost and weakening the intensity of the ghost; the size of R3 can affect the bending degree of the lens and the processing difficulty of the lens, R3 is too small, the bending degree of the lens affects the processing of the lens, and the larger R3 is, the flatter the surface of the lens is, and other components similar to the plane are easy to generate ghost images.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
3<f3/f<4；
wherein f3 is a focal length of the third lens L3, and f is a focal length of the optical imaging system 10, that is, f3/f can be any value in the range of (3, 4), for example: 3.1, 3.3, 3.6, 3.8, 3.9, etc.
By satisfying the definition of the conditional expressions, it is possible to secure a positive refracting power for converging the light rays diverged by the first lens L1 and the second lens L2 under a strong negative refracting power; further, the burden of the converging action of the fourth lens L4 and the fifth lens L5 can be reduced, and it is not necessary to obtain a strong bending force, so that the degree of freedom in design can be secured. It is also possible to ensure that the angle between the normal to the object-side surface S5 and the image-side surface S6 of the third lens L3 and the incident light does not become too large, and the occurrence of high-order aberration is easily suppressed. When f3/f exceeds the limit of the conditional expression, the positive bending force becomes too strong, which is not favorable for suppressing the high-order aberration.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
3<(R5-R6)/(R5+R6)<8；
wherein R5 is the radius of curvature of the object-side surface S5 of the third lens element L3 at the paraxial region, and R6 is the radius of curvature of the image-side surface S6 of the third lens element L3 at the paraxial region, that is, (R5-R6)/(R5+ R6) may be any value in the range of (3, 8), for example: 3.1, 3.3, 3.6, 3.8, 7.9.
By satisfying the restrictions of the conditional expressions, the angle at which the principal ray at the peripheral angle of view enters the image plane S15 can be reduced. And the generation of astigmatism can be inhibited, the risk of ghost image generation is reduced, and the system resolution capability is improved. When (R5-R6)/(R5+ R6) exceeds the conditional expression range, astigmatism is easily generated, and the imaging quality is reduced.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
0.5<R5/CT3<2；
wherein R5 is a curvature radius of the object-side surface S5 of the third lens element L3 near the optical axis, and CT3 is a thickness of the third lens element L3 on the optical axis, that is, R5/CT3 can be any value in the range of (0.5, 2), for example: 0.6, 1, 1.3, 1.6, 1.9, etc.
Because the third lens L3 is of a biconvex structure, the light can be converged further by satisfying the limitation of the conditional expression, so that the surface shape of the third lens L3 is smooth, the deviation of the incident angle and the emergent angle of the light with different fields of view can be reduced, and the sensitivity is reduced; the third lens L3 with a relatively thick thickness can reduce the processing difficulty and the sensitivity of the thickness tolerance, thereby increasing the yield.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
0.5<f45/f123<2；
wherein f45 is a combined focal length of the fourth lens L4 and the fifth lens L5, and f123 is a combined focal length of the first lens L1, the second lens L2 and the third lens L3, that is, f45/f123 can be any value in the range of (0.5, 2), for example, the value is: 0.6, 1, 1.3, 1.6, 1.9.
By satisfying the limitation of the conditional expression, the positive bending force can be restricted within a reasonable range. When f45/f123 exceeds the range of the conditional expression, the positive bending force of f123 and f45 is too large or too small, so that the whole optical imaging system 10 is in the condition of too large local bending force, and the effect of the Back Focal Length (BFL) of the optical imaging system on thermal expansion and cold contraction (namely, the Back Focal Length of the lens is shortened under the high-temperature condition, and the Back Focal Length of the lens is not in accordance with the use condition of the optical imaging system under the low-temperature condition) is too obvious, thereby influencing the imaging definition of the optical imaging system 10 in the temperature range of-40 ℃ to +85 ℃.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
(CT4-CT5)/(α4-α5)<0；
wherein CT4 and CT5 are the central thicknesses of the fourth lens L4 and the fifth lens L5, respectively, on the optical axis, α 4 and α 5 are the thermal expansion coefficients of the fourth lens L4 and the fifth lens L5, respectively, and the unit of the thermal expansion coefficient is 10-5V. C. I.e., (CT4-CT5) and (. alpha.4-. alpha.5) both have a positive-negative value.
Because the fourth lens L4 and the fifth lens L5 are cemented, the parameter setting satisfying the conditional expression can avoid the defects of degumming, cracking and the like caused by too large thermal expansion difference between the fourth lens L4 and the fifth lens L5, and is also beneficial to improving the temperature sensitivity of the optical imaging system 10, and ensuring that the optical imaging system 10 can show excellent imaging quality and higher resolving power in high and low temperature environments.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
4<(CT3+d34)/f<5；
wherein, CT3 is the central thickness of the third lens element L3 on the optical axis, d34 is the air space between the image-side surface of the third lens element L3 and the object-side surface of the fourth lens element L4 on the optical axis, and f is the focal length of the optical imaging system 10, that is, (CT3+ d34)/f can be any value in the range of (4, 5), for example: 4.1, 4.3, 4.6, 4.9, etc.
By satisfying the limitation of the conditional expressions, the thickness of the third lens L3 and/or the air space between the third lens L3 and the fourth lens L4 on the optical axis can be prevented from being too large, thereby being beneficial to realizing the miniaturization of the system; on the premise of satisfying the optical performance of the system, the central thickness of the third lens L3 and/or the distance between the third lens L3 and the fourth lens L4 on the optical axis is increased moderately, which is favorable for correcting the aberration of the system and improving the imaging quality of the system. When (CT3+ d34)/f exceeds the upper limit of the conditional expression, the thickness of the third lens L3 and/or the air space between the third lens L3 and the fourth lens L4 on the optical axis is too large, which is not favorable for realizing the miniaturization of the optical imaging system 10. When (CT3+ d34)/f exceeds the lower limit of the conditional expression, it is not favorable for the correction of the aberration of the optical imaging system 10, thereby reducing the imaging quality of the optical imaging system 10.
In some embodiments, at least one surface of at least one lens in the optical imaging system 10 is aspheric. For example, in the first embodiment, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 in the optical imaging system 10 are all aspherical surfaces.
The aspherical surface has a surface shape determined by the following formula:
wherein Z is the longitudinal distance between any point on the aspheric surface and the surface vertex, r is the distance between any point on the aspheric surface and the optical axis, the vertex curvature (the reciprocal of the curvature radius) of c, k is a conic constant, and Ai is the correction coefficient of the i-th order of the aspheric surface.
Therefore, the optical imaging system 10 can effectively reduce the overall size of the optical imaging system 10 by adjusting the curvature radius and the aspheric surface coefficient of each lens surface, occupy a small space, and can effectively correct aberration and improve imaging quality.
First embodiment
Referring to fig. 1 and fig. 2, the optical imaging system 10 of the first embodiment includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, and a fifth lens element L5 with positive refractive power.
The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is concave along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is convex along the optical axis, and the image-side surface S8 is concave along the optical axis; the object-side surface S9 of the fifth lens element L5 is convex along the optical axis, and the image-side surface S10 is convex along the optical axis.
Further, the stop STO is disposed between the third lens L3 and the fourth lens L4.
Further, the optical imaging system 10 further includes a filter L6 disposed on the image-side surface S10 of the fifth lens L5, and a protective glass L7 disposed between the image-side surface S12 of the filter L6 and the image surface S15.
The reference wavelength in the first embodiment is 546.074nm, and the optical imaging system 10 in the first embodiment satisfies the conditions of the following table.
TABLE 1
It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the field angle of the optical imaging system 10.
TABLE 2
Second embodiment
Referring to fig. 3 and 4, the optical imaging system 10 of the second embodiment includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, and a fifth lens element L5 with positive refractive power.
The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is concave along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is convex along the optical axis, and the image-side surface S8 is concave along the optical axis; the object-side surface S9 of the fifth lens element L5 is convex along the optical axis, and the image-side surface S10 is convex along the optical axis.
Further, the stop STO is disposed between the third lens L3 and the fourth lens L4.
Further, the optical imaging system 10 further includes a filter L6 disposed on the image-side surface S10 of the fifth lens L5, and a protective glass L7 disposed between the image-side surface S12 of the filter L6 and the image surface S15.
The reference wavelength in the second embodiment is 546.074nm, and the optical imaging system 10 in the second embodiment satisfies the conditions of the following table.
TABLE 3
It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the field angle of the optical imaging system 10.
TABLE 4
Third embodiment
Referring to fig. 5 and fig. 6, the optical imaging system 10 of the third embodiment includes, in order from the object side to the image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, and a fifth lens element L5 with positive refractive power.
The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is concave along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is convex along the optical axis, and the image-side surface S8 is concave along the optical axis; the object-side surface S9 of the fifth lens element L5 is convex along the optical axis, and the image-side surface S10 is convex along the optical axis.
Further, the stop STO is disposed between the third lens L3 and the fourth lens L4.
Further, the optical imaging system 10 further includes a filter L6 disposed on the image-side surface S10 of the fifth lens L5, and a protective glass L7 disposed between the image-side surface S12 of the filter L6 and the image surface S15.
The reference wavelength in the third embodiment is 546.074nm, and the optical imaging system 10 in the third embodiment satisfies the conditions of the following table.
TABLE 5
It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the field angle of the optical imaging system 10.
TABLE 6
Fourth embodiment
Referring to fig. 7 and 8, the optical imaging system 10 of the fourth embodiment includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, and a fifth lens element L5 with positive refractive power.
The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is concave along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is convex along the optical axis, and the image-side surface S8 is concave along the optical axis; the object-side surface S9 of the fifth lens element L5 is convex along the optical axis, and the image-side surface S10 is convex along the optical axis.
Further, the stop STO is disposed between the third lens L3 and the fourth lens L4.
Further, the optical imaging system 10 further includes a filter L6 disposed on the image-side surface S10 of the fifth lens L5, and a protective glass L7 disposed between the image-side surface S12 of the filter L6 and the image surface S15.
The reference wavelength in the fourth embodiment is 546.074nm, and the optical imaging system 10 in the fourth embodiment satisfies the conditions of the following table.
TABLE 7
It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the field angle of the optical imaging system 10.
TABLE 8
Fifth embodiment
Referring to fig. 9 and 10, the optical imaging system 10 of the fifth embodiment includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, and a fifth lens element L5 with positive refractive power.
The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is concave along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is convex along the optical axis, and the image-side surface S8 is concave along the optical axis; the object-side surface S9 of the fifth lens element L5 is convex along the optical axis, and the image-side surface S10 is convex along the optical axis.
Further, the stop STO is disposed between the third lens L3 and the fourth lens L4.
Further, the optical imaging system 10 further includes a filter L6 disposed on the image-side surface S10 of the fifth lens L5, and a protective glass L7 disposed between the image-side surface S12 of the filter L6 and the image surface S15.
The reference wavelength in the fifth embodiment is 546.074nm, and the optical imaging system 10 in the fifth embodiment satisfies the conditions of the following table.
TABLE 9
It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the field angle of the optical imaging system 10.
Table 11 shows values of (f1-f2)/f, TTL/f, d12/f, R3/R4, f3/f, (R5-R6)/(R5+ R6), R5/CT3, f45/f123, (CT4-CT5)/(α 4- α 5), and (CT3+ d34)/f in the optical imaging systems of example one to example five.
Table 11
| Examples | (f1-f2)/f | TTL/f | d12/f | R3/R4 | f3/f |
| A | -4.809 | 16.542 | 2.812 | -59.892 | 3.545 |
| II | -4.806 | 16.512 | 2.814 | -60.532 | 3.551 |
| III | -4.846 | 16.611 | 2.856 | -61.777 | 3.582 |
| Fourthly | -4.912 | 16.656 | 2.894 | -46.230 | 3.606 |
| Five of them | -5.108 | 16.787 | 3.049 | -20.925 | 3.621 |
| Examples | (R5-R6)/(R5+R6) | R5/CT3 | f45/f123 | (CT4-CT5)/(α4-α5) | (CT3+d34)/f |
| A | 3.072 | 1.578 | 1.618 | -1.208 | 4.458 |
| II | 3.190 | 1.551 | 1.514 | -1.232 | 4.462 |
| III | 3.705 | 1.441 | 1.324 | -1.242 | 4.529 |
| Fourthly | 3.580 | 1.474 | 1.280 | -1.210 | 4.529 |
| Five of them | 7.418 | 1.143 | 1.038 | -1.104 | 4.691 |
Referring to fig. 11, an image capturing module 100 according to an embodiment of the present invention includes an optical imaging system 10 and a photosensitive element 20, wherein the photosensitive element 20 is disposed on an image side of the optical imaging system 10.
Specifically, the photosensitive element 20 may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled device (CCD).
The image capturing module 100 according to the embodiment of the present invention corrects aberration by reasonably configuring the bending force and the surface shape of each lens and using the aspheric lens in the optical imaging system 10, so that the image capturing module can maintain good optical performance and a large field angle while directly maintaining small size and light weight without increasing the number of lenses, and can capture details of a subject well.
Referring to fig. 12, an electronic device 200 according to an embodiment of the invention includes a housing 210 and an image capturing module 100, wherein the image capturing module 100 is mounted on the housing 210.
The electronic device 200 of the embodiment of the invention includes, but is not limited to, an imaging-enabled electronic device such as a smart phone, a tablet computer, a notebook computer, an electronic book reader, a Portable Multimedia Player (PMP), a portable phone, a video phone, a digital still camera, a mobile medical device, and a wearable device.
The optical imaging system 10 in the electronic device 200 according to the above-described embodiment corrects aberration by appropriately arranging the bending force and the surface shape of each lens and using an aspherical lens in the optical imaging system 10, and thus achieves a small and lightweight optical device without increasing the number of lenses, while maintaining good optical performance and a large angle of view, and can capture details of a subject well.
Referring to fig. 13, a carrier 300 according to an embodiment of the present invention includes a body 310 and an image capturing module 100, wherein the image capturing module 100 is mounted on the body 310.
The vehicle 300 according to the embodiment of the present invention includes, but is not limited to, a small passenger car, a small goods car, a large passenger car, a large goods car, a forklift, a bulldozer, and other vehicles capable of being driven manually or automatically.
The optical imaging system 10 in the carrier 300 according to the above embodiment corrects aberration by using an aspherical lens in the optical imaging system 10 by appropriately arranging the bending force and the surface shape of each lens, and thus can achieve a small and light weight without increasing the number of lenses, and can capture details of a subject with good optical performance and a large angle of view while maintaining good optical performance.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (14)
1. An optical imaging system, comprising, in order from an object side to an image side:
the first lens group with negative bending force, the surface of the first lens group closest to the image side is a concave surface;
the second lens group with positive bending force, the surfaces of the second lens group closest to the object side and the image side are convex surfaces;
the third lens group with positive bending force, the surfaces of the third lens group closest to the object side and the image side are convex surfaces;
the optical imaging system further comprises a diaphragm, and the diaphragm is arranged on the object side of the third lens group.
2. The optical imaging system of claim 1,
the first lens group is composed of a first lens having a negative refracting power and a second lens having a negative refracting power;
the second lens group is composed of a third lens having positive bending power;
the third lens group consists of a fourth lens with negative bending force and a fifth lens with positive bending force, wherein the fourth lens and the fifth lens are of a glued structure, and the glued surfaces of the fourth lens and the fifth lens are convex to the object side of the optical imaging system at the optical axis;
the optical imaging system satisfies the following conditional expression:
-6.5<(f1-f2)/f<-4；
wherein f1 and f2 are focal lengths of the first lens and the second lens, respectively, and f is a focal length of the optical imaging system.
3. The optical imaging system of claim 2, wherein the optical imaging system satisfies the following conditional expression:
16<TTL/f<17；
wherein, TTL is a distance on an optical axis from the object-side surface of the first lens element to an imaging surface of the optical imaging system, and f is a focal length of the optical imaging system.
4. The optical imaging system of claim 2, wherein the optical imaging system satisfies the following conditional expression:
2<d12/f<4；
wherein d12 is an air space on an optical axis between an image side surface of the first lens and an object side surface of the second lens, and f is a focal length of the optical imaging system.
5. The optical imaging system of claim 2, wherein the optical imaging system satisfies the following conditional expression:
-62<R3/R4<-20；
wherein R3 is a radius of curvature at the object side paraxial axis of the second lens, and R4 is a radius of curvature at the image side paraxial axis of the second lens.
6. The optical imaging system of claim 2, wherein the optical imaging system satisfies the following conditional expression:
3<f3/f<4；
wherein f3 is the focal length of the third lens, and f is the focal length of the optical imaging system.
7. The optical imaging system of claim 2, wherein the optical imaging system satisfies the following conditional expression:
3<(R5-R6)/(R5+R6)<8；
wherein R5 is a radius of curvature at a paraxial axis of an object side surface of the third lens, and R6 is a radius of curvature at a paraxial axis of an image side surface of the third lens.
8. The optical imaging system of claim 2, wherein the optical imaging system satisfies the following conditional expression:
0.5<R5/CT3<2；
wherein R5 is a curvature radius of an object side surface of the third lens at a position close to an optical axis, and CT3 is a central thickness of the third lens on the optical axis.
9. The optical imaging system of claim 2, wherein the optical imaging system satisfies the following conditional expression:
0.5<f45/f123<2；
wherein f45 is a combined focal length of the fourth lens and the fifth lens, and f123 is a combined focal length of the first lens, the second lens, and the third lens.
10. The optical imaging system of claim 2, wherein the optical imaging system satisfies the following conditional expression:
(CT4-CT5)/(α4-α5)<0；
wherein CT4 and CT5 are central thicknesses of the fourth lens and the fifth lens on an optical axis, respectively, α 4 and α 5 are coefficients of thermal expansion of the fourth lens and the fifth lens, respectively, and a unit of the coefficient of thermal expansion is 10-5/℃。
11. The optical imaging system of claim 2, wherein the optical imaging system satisfies the following conditional expression:
4<(CT3+d34)/f<5；
wherein CT3 is a central thickness of the third lens element on an optical axis, d34 is an air space between an image-side surface of the third lens element and an object-side surface of the fourth lens element on the optical axis, and f is a focal length of the optical imaging system.
12. An image capturing module comprises:
the optical imaging system of any one of claims 1 to 11; and
the photosensitive element is arranged on the image side of the optical imaging system.
13. An electronic device, comprising:
a housing; and
the image capturing module of claim 12, wherein the image capturing module is mounted on the housing.
14. A carrier, comprising:
a body; and
the image capturing module as claimed in claim 12, wherein the image capturing module is mounted on the body.
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