CN111856722A - Optical imaging system, image capturing module, electronic device and automobile - Google Patents
Optical imaging system, image capturing module, electronic device and automobile Download PDFInfo
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- CN111856722A CN111856722A CN202010876380.0A CN202010876380A CN111856722A CN 111856722 A CN111856722 A CN 111856722A CN 202010876380 A CN202010876380 A CN 202010876380A CN 111856722 A CN111856722 A CN 111856722A
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 219
- 230000014509 gene expression Effects 0.000 claims abstract description 68
- 238000005452 bending Methods 0.000 claims abstract description 45
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- 239000006185 dispersion Substances 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 abstract description 40
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- 201000009310 astigmatism Diseases 0.000 description 19
- 239000011521 glass Substances 0.000 description 15
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- 238000010226 confocal imaging Methods 0.000 description 7
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- 230000006872 improvement Effects 0.000 description 5
- 239000006059 cover glass Substances 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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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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 present application provides an optical imaging system, sequentially comprising from an object side to an image side: a first lens having a negative bending force; a second lens having a negative bending force; a third lens having a positive refracting power; a fourth lens having a positive refracting power; a fifth lens having a positive refracting power; a sixth lens having a negative refracting power; the optical imaging system satisfies the following conditional expression: 1/(n)i486‑ni950) Less than or equal to 30; wherein 1/(n)i486‑ni950) Is the difference between the refractive index of the i-th lens at 486nm reference light and the refractive index of the i-th lens at 950nm reference light. The optical imaging system has better imaging capability under the environment with different light brightness. The application also proposes to have such an opticsAn image capturing module of an imaging system, an electronic device with the image capturing module and an automobile.
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 an automobile.
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. With the increasing requirements of the automobile field on road traffic safety and automobile safety, and the rise of the look-around camera, the driving assistance system and the unmanned driving market, the vehicle-mounted lens is more and more applied to the automobile driving assistance system. Meanwhile, due to the diversification of the use environment, people also put forward higher requirements on the imaging quality of the camera module under different ambient light conditions, the comfort level of pictures and the like.
In the process of implementing the present application, the inventor finds that at least the following problems exist in the prior art: the current optical camera module is generally difficult to realize possessing good imaging quality in the environment with darker light such as night, tunnel, underground parking lot, mine hole. Especially when light brightness changes, the module of making a video recording can't accomplish the focus altogether, and then leads to the formation of image effect unsatisfactory.
Disclosure of Invention
In view of the above, it is necessary to provide an optical imaging system with day and night confocal and an image capturing module, an electronic device and an automobile having the optical imaging system 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:
a first lens having a negative bending force;
a second lens having a negative bending force;
a third lens having a positive refracting power;
a fourth lens having a positive refracting power;
a fifth lens having a positive refracting power;
a sixth lens having a negative refracting power;
at least one lens of the optical imaging system satisfies the following conditional expression:
1/(ni486-ni950)≤30；
wherein, 1/(n)i486-ni950) The refractive index of the i-th lens under 486nm reference light and 950nm reference lightThe difference in refractive index of (a).
In the optical imaging system of this application embodiment, through the reasonable tortuous power configuration of first lens, second lens, third lens, fourth lens, fifth lens and sixth lens, satisfied optical imaging system to the confocal demand of formation of image of day night for optical imaging system also can have better imaging ability in the darker environment of light such as night, tunnel, mine cave, underground parking garage.
The optical imaging system also enables the chromatic aberration of the optical imaging system between the visible light wave band and the near infrared wave band to be corrected by meeting the conditional expression, and further facilitates the optical imaging system to generate reduced defocusing change when the optical imaging system is suitable under the visible light environment and when the optical imaging system is switched to the near infrared wave band for use. When the constraint of the conditional expression is exceeded, the optical imaging system generates a large defocus variation when used in two environments, and generates imaging blur in a certain environment, so that the resolution is reduced.
In some embodiments, the optical imaging system satisfies the following conditional expression:
-13<f123/f<-8；
wherein f123 is a combined focal length of the first lens, the second lens and the third lens, and f is a focal length of the optical imaging system.
The first lens, the second lens and the third lens are all lens groups arranged in front of the diaphragm, and the lens groups integrally provide negative bending force for the system by satisfying the conditional expressions, so that the large-angle light beams can penetrate through and enter the diaphragm, the wide angle of the optical imaging system is realized, and the improvement of the brightness of the image surface of the large-angle view field is ensured. When the upper limit of the conditional expression is exceeded, the bending force of the lens group is too strong, and the large-angle edge field of view is easy to generate serious astigmatism, so that the edge resolution force is reduced; if the lower limit of the conditional expression is exceeded, the bending force of the lens group is insufficient, which is not favorable for the wide angle of the optical imaging system.
In some embodiments, the optical imaging system satisfies the following conditional expression:
2<R1/f<4；
wherein R1 is a radius of curvature of the object-side surface of the first lens at the optical axis, and f is a focal length of the optical imaging system.
Controlling the convergence capacity of the light ray bundle on the object side surface of the optical imaging system by controlling the curvature radius of the object side surface of the first lens; by satisfying the conditional expressions, the optical imaging system can be made more compact while contributing to a wider angle of view. When the lower limit of the conditional expression is exceeded, the object side surface of the first lens is too bent, which is not beneficial to the processing of the lens process; when the upper limit of the relation is exceeded, the aberration of the optical imaging system is not corrected favorably.
In some embodiments, the optical imaging system satisfies the following conditional expression:
-6<f2/CT2<-4；
wherein f2 is the focal length of the second lens, and CT2 is the thickness of the second lens on the optical axis.
Because the second lens provides negative bending force for the system, the relation between the bending force and the thickness of the second lens is controlled by meeting the conditional expression, the width of a light beam is favorably expanded, the light rays which are shot after the light rays with large angles are refracted by the first lens are widened, the aberration generated by the lens in front of the diaphragm is corrected, and the characteristic of high pixel of the system is reflected; when the range of the conditional expression is exceeded, the aberration of the optical imaging system is not corrected, and the imaging quality is reduced.
In some embodiments, the optical imaging system satisfies the following conditional expression:
-1.5<sags3/sags4<-1.1；
wherein sags3 is the saggital height of the second lens object side optically effective diameter edge and sags4 is the saggital height of the second lens image side optically effective diameter edge.
The second lens can correct the edge aberration of the optical imaging system, inhibit the generation of astigmatism, control the shape of the second lens, avoid the excessive bending of the lens surface and be beneficial to reducing the processing difficulty of the lens. When the limit of the conditional expression is exceeded, the correction of the aberration of the optical imaging system is not facilitated.
In some embodiments, at least one lens of the optical imaging system satisfies the following conditional expression:
vdi≤25；
where vdi is the dispersion coefficient of the i-th lens under d-light.
And a certain lens in the optical imaging system meets the conditional expression, so that chromatic aberration is corrected, and the color saturation of the optical imaging system in the imaging of the visible light environment is improved.
In some embodiments, the optical imaging system satisfies the following conditional expression:
2<f4/f<4.2；
wherein f4 is the focal length of the fourth lens, and f is the focal length of the optical imaging system.
The fourth lens provides positive bending force for the system, and the fourth lens meets the conditional expression, so that high-order aberration caused by the light beam at the periphery of the imaging area is favorably inhibited, and the resolution performance of the optical imaging system is effectively improved. When the upper limit of the conditional expression is exceeded, the bending force of the fourth lens is not enough to inhibit high-order aberration, so that high-order spherical aberration, coma aberration and other phenomena influence the resolution and the imaging quality of the optical imaging system; when the bending force of the fourth lens is too strong and exceeds the lower limit of the conditional expression, the width of the light ray bundle is rapidly contracted, the incident angle of the light ray incident to the rear lens group is increased, and the burden of the rear lens group on reducing the light ray angle of the light ray emergent system is increased.
In some embodiments, the optical imaging system satisfies the following conditional expression:
5.3<Imgh/epd<6.0；
where Imgh is a vertical distance from a farthest point of an image formed by the optical imaging system to the optical axis, and epd is an entrance pupil diameter of the optical imaging system.
By satisfying the conditional expression, the improvement of the image surface brightness during the imaging of the large target surface is favorably ensured. When the upper limit of the conditional expression is exceeded, the diameter of the entrance pupil of the optical imaging system is smaller, the width of a light beam emitted by the optical imaging system is reduced, and the improvement of the image surface brightness is not facilitated; when the lower limit of the conditional expression is exceeded, the image plane area of the optical imaging system is small, and the field angle range of the optical imaging system is narrowed.
In some embodiments, the optical imaging system satisfies the following conditional expression:
8mm-1<tan(1/2*FOV)/f＜11mm-1；
wherein FOV is the maximum field angle of the optical imaging system, and f is the focal length of the optical imaging system.
By limiting the condition, the control of the distortion of the edge field of view of the large-angle optical imaging system is facilitated, the image plane deformation is avoided, and the discrimination precision of the system is improved. When the limit of the conditional expression is exceeded, the edge distortion control of the optical imaging system in large-angle imaging is not facilitated, and the imaging quality is reduced.
In some embodiments, the optical imaging system satisfies the following conditional expression:
1.9<TTL/ΣCT<2.3；
wherein, TTL is a distance from an object-side surface of the first lens element to an image plane on an optical axis, and Σ CT is a sum of thicknesses of the respective lens elements of the optical imaging system on the optical axis.
By satisfying the range of the conditional expression, the total length of the optical imaging system can be made to satisfy the characteristics of miniaturization and weight reduction. When the lower limit of the conditional formula is exceeded: the thickness distribution of each lens in the total length of the optical imaging system is excessive, which is not beneficial to the light weight characteristic of the system; if the upper limit of the conditional expression is exceeded, the total optical length of the optical imaging system becomes too long, which is disadvantageous to the miniaturization of the system.
An embodiment of the present invention provides an image capturing module, including the optical imaging system and a photosensitive element described in any of the above embodiments, where the photosensitive element is disposed on an image side of the optical imaging system.
The image capturing module comprises an optical imaging system, the optical imaging system reasonably configures the bending force of the internal lens, and limits the refractive index difference of at least one lens at different wavelengths, so that the requirement of the image capturing module on day and night confocal imaging is met. Get for instance the module and still realized in darker environment such as night, tunnel, mine hole, underground parking garage through optical imaging system, also can have better imaging ability.
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 acquisition module, and the imaging quality of the optical imaging system can be improved through reasonable configuration of the bending force, so that the electronic device meets the requirements of day and night confocal imaging, and has better imaging capability in dark environments such as night, tunnels, mine caves, underground parking lots and the like.
An embodiment of the present invention provides an automobile 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 automobile provided by the embodiment of the invention comprises the image acquisition module, and the imaging quality of the optical imaging system can be improved through reasonable configuration of the bending force, so that the requirement of the automobile on day-night confocal imaging is met, and the automobile can have better imaging capability in dark environments such as night, tunnels, mine caves and underground parking lots.
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 of 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 of 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 of 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 according to 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 according to 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 view of an automobile according to an embodiment of the present invention.
Description of the main elements
First lens L1
Second lens L2
Third lens L3
Fourth lens L4
Fifth lens L5
Sixth lens L6
Optical filter L7
Cover glass L8
Stop STO
Object sides S1, S3, S5, S7, S9, S11, S13, S15
Like sides S2, S4, S6, S8, S10, S12, S14, S16
Image plane S17
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 L1 having a negative bending force; a second lens L2 having a negative bending force; a third lens L3 having a positive bending force; a fourth lens L4 having a positive bending force; a fifth lens L5 having a positive bending force; the sixth lens L6, the fifth lens L5 and the sixth lens L6 have a cemented structure, and the fifth lens L5 and the sixth lens L6 have a positive refractive power as a whole.
Specifically, 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, the fifth lens L5 has an object side surface S9 and an image side surface S10, and the sixth lens L6 has an object side surface S11 and an image side surface S12. The image-side surface S10 of the fifth lens element L5 and the object-side surface S11 of the sixth lens element L6 are cemented surfaces.
Further, at least one lens of the optical imaging system 10 satisfies the following conditional expression:
1/(ni486-ni950)≤30；
wherein, 1/(n)i486-ni950) Is the difference between the refractive index of the i-th lens at 486nm reference light and the refractive index of the i-th lens at 950nm reference light.
In the optical imaging system 10 of the embodiment of the application, the requirement of the optical imaging system 10 for day-night confocal imaging is met through reasonable bending force configuration of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6, so that the optical imaging system 10 can have better imaging capability in environments with dark light rays such as night, tunnels, mine caves and underground parking lots.
The optical imaging system 10 also enables the chromatic aberration of the optical imaging system 10 between the visible light band and the near infrared band to be corrected by satisfying the above conditional expressions, thereby being beneficial to the optical imaging system 10 to generate reduced defocus variation when being applicable in a visible light environment and when being switched to a near infrared band. When the constraint of the conditional expression is exceeded, the optical imaging system generates a large defocus variation when used in two environments, and generates imaging blur in a certain environment, so that the resolution is reduced.
In some embodiments, the optical imaging system 10 further includes a stop STO disposed between the third lens L3 and the fourth lens L4. The optical imaging system 10 is provided with the stop STO to reduce stray light, which helps to improve image quality.
Further, the 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, the wavelength range of use of the optical imaging system 10 includes the visible and infrared bands.
The application range of the optical imaging system 10 includes visible light and infrared light at the same time, and infrared light imaging is helpful to improve the imaging capability of the optical imaging system 10 in an environment with dark visible light, and improve the imaging quality.
In some embodiments, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is concave at the paraxial region, and the image-side surface S4 is convex at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 is convex at the paraxial region; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region thereof, and the image-side surface S8 is convex at the paraxial region thereof; the object-side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S10 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image-side surface S12 is convex at the paraxial region.
The optical imaging system 10 has a wide field of view through reasonable lens configuration, reduces the size of the optical imaging system 10 while maintaining good optical performance, realizes miniaturization of the optical imaging system 10, and has good day and night confocal capability.
In some embodiments, optical imaging system 10 further includes a filter L7, filter L7 having an object side S13 and an image side S14. The filter L7 is disposed on the image side surface S12 of the sixth lens L6. The filter L7 uses a band pass filter to cut off the light in the non-used wavelength band and only pass the light (including visible light and infrared light) in the imaging wavelength band, so that the optical imaging system 10 can be more clear during imaging and avoid interference.
In some embodiments, optical imaging system 10 further includes a cover glass L8, cover glass L8 having an object side S15 and an image side S16. The cover glass L8 is provided between the image side surface S14 and the image surface S17 of the filter L7. The protective glass L8 is completely transparent and light can directly pass through, and the protective glass L8 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 sixth lens L6, the filter L7 and the protective glass L8 in sequence, and finally converge on the image plane S17.
In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the filter L7 and the protective glass L8 are made of glass.
In some embodiments, the first lens L1, the third lens L3, the fifth lens L5 and the sixth lens L6 are all spherical mirrors, and the second lens L2 and the fourth lens L4 are aspheric mirrors.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
-13<f123/f<-8；
wherein f123 is a combined focal length of the first lens L1, the second lens L2, and the third lens L3, and f is a focal length of the optical imaging system 10.
The first lens L1, the second lens L2 and the third lens L3 are all lens groups arranged in front of the stop STO, and by satisfying the conditional expressions, the whole lens group provides negative bending force for the system, so that large-angle light beams can penetrate through and enter the stop STO, the wide angle of the optical imaging system 10 is realized, and the improvement of the brightness of the image surface of a large-angle view field is ensured. When the upper limit of the conditional expression is exceeded, the bending force of the lens group is too strong, and the large-angle edge field of view is easy to generate serious astigmatism, so that the edge resolution force is reduced; if the conditional lower limit is exceeded, the lens group has insufficient bending force, which is disadvantageous to the wide angle of the optical imaging system 10.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
2<R1/f<4；
where R1 is a radius of curvature of the object-side surface S1 of the first lens L1 at the optical axis, and f is a focal length of the optical imaging system 10.
Controlling the size of the curvature radius of the object side S1 of the first lens L1 to control the convergence capability of the light beam of the object side of the optical imaging system 10; satisfying the conditional expressions is advantageous for widening the angle of the optical imaging system 10 and also satisfies the characteristic of downsizing the system. When the conditional lower limit is exceeded, the object side S1 of the first lens L1 is too curved to facilitate the lens processing; when the upper limit of the relation is exceeded, the aberration of the optical imaging system 10 is not corrected.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
-6<f2/CT2<-4；
wherein f2 is the focal length of the second lens L2, and CT2 is the thickness of the second lens L2 on the optical axis.
Because the second lens L2 provides negative bending force for the system, the relation between the bending force and the thickness of the second lens L2 is controlled by satisfying the conditional expression, the width of light beams is favorably expanded, the light beams which are absorbed after the light beams with large angles are refracted by the first lens L1 are widened, the aberration generated by the lens in front of the stop STO is corrected, and the characteristic of high pixel of the system is reflected; when the range of the conditional expression is exceeded, the aberration of the optical imaging system 10 is not corrected, and the imaging quality is reduced.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
-1.5<sags3/sags4<-1.1；
wherein sags3 is the saggital height of the optically effective diameter edge of the object side S3 of the second lens L2, and sags4 is the saggital height of the optically effective diameter edge of the image side S4 of the second lens L2.
The second lens L2 can correct the edge aberration of the optical imaging system 10, suppress the occurrence of astigmatism, and control the shape of the second lens L2, so that the lens surface is prevented from being excessively curved, which is beneficial to reducing the processing difficulty of the lens. When the conditional limit is exceeded, the aberration of the optical imaging system 10 is not corrected.
In some embodiments, at least one lens of the optical imaging system 10 satisfies the following conditional expression:
vdi≤25；
where vdi is the dispersion coefficient of the i-th lens under d-light.
A certain lens in the optical imaging system 10 satisfies the conditional expression, which is beneficial to correcting chromatic aberration and improving the color saturation of the optical imaging system 10 in the imaging in the visible light environment.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
2<f4/f<4.2；
wherein f4 is the focal length of the fourth lens L4, and f is the focal length of the optical imaging system 10.
Since the fourth lens L4 provides a positive refractive power to the system, it is advantageous to suppress high-order aberrations caused by the light beam in the peripheral portion of the imaging region by satisfying the conditional expressions, thereby effectively improving the resolution performance of the optical imaging system 10. When the upper limit of the conditional expression is exceeded, the bending force of the fourth lens L4 is insufficient to achieve suppression of high-order aberrations, so that high-order spherical aberration, coma aberration and other phenomena occur to affect the resolution and imaging quality of the optical imaging system 10; when the lower limit of the conditional expression is exceeded, the bending force of the fourth lens L4 is too strong, which causes the width of the light beam to shrink rapidly, and further causes the incident angle of the light beam incident on the rear lens group to increase, and increases the burden of the rear lens group on reducing the light angle when the light beam exits the system.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
5.3<Imgh/epd<6.0；
where Imgh is the vertical distance from the farthest point of the image formed by the optical imaging system 10 to the optical axis, and epd is the entrance pupil diameter of the optical imaging system 10.
By satisfying the conditional expression, the improvement of the brightness of the image surface S17 during the imaging of the large target surface is facilitated. When the upper limit of the conditional expression is exceeded, the diameter of the entrance pupil of the optical imaging system 10 is smaller, the width of a beam of rays incident into the optical imaging system 10 is reduced, and the brightness of the image plane S17 is not favorably improved; if the lower limit of the conditional expression is exceeded, the area of the image plane S17 of the optical imaging system 10 is small, and the field angle range of the optical imaging system 10 is narrowed.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
8mm-1<tan(1/2*FOV)/f＜11mm-1；
where FOV is the maximum field angle of the optical imaging system 10 and f is the focal length of the optical imaging system 10.
By satisfying the limitation of the conditional expression, the control of the distortion of the edge field of view of the large-angle optical imaging system 10 is facilitated, the image plane deformation is avoided, and the discrimination precision of the system is improved. When the conditional limit is exceeded, the edge distortion control of the optical imaging system 10 at large angle imaging is not facilitated, resulting in reduced imaging quality.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
1.9<TTL/ΣCT<2.3；
wherein TTL is an axial distance from the object-side surface S1 to the image plane S17 of the first lens element L1, and Σ CT is a sum of thicknesses of the lens elements of the optical imaging system 10 on the optical axis.
By satisfying the range of the conditional expressions, the overall length of the optical imaging system 10 can be made to satisfy the features of miniaturization and weight reduction. When the lower limit of the conditional formula is exceeded: the thickness distribution of each lens in the total length of the optical imaging system 10 is too much, which is not favorable for the light weight characteristic of the system; if the upper limit of the conditional expression is exceeded, the total optical length of the optical imaging system 10 becomes too long, which is disadvantageous in downsizing the system.
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 and the fourth lens L4 in the optical imaging system 10 are aspherical.
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 L1 with negative bending force, a second lens L2 with negative bending force, a third lens L3 with positive bending force, a fourth lens L4 with positive bending force, a fifth lens L5 with positive bending force, and a sixth lens L6 with negative bending force. The fifth lens L5 and the sixth lens L6 are of a cemented structure, and the fifth lens L5 and the sixth lens L6 have a positive bending force as a whole.
The object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is concave at the paraxial region, and the image-side surface S4 is convex at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 is convex at the paraxial region; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region thereof, and the image-side surface S8 is convex at the paraxial region thereof; the object-side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S10 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image-side surface S12 is convex at the paraxial region.
Further, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of glass.
Furthermore, the first lens L1, the third lens L3, the fifth lens L5 and the sixth lens L6 are all spherical mirrors, and the second lens L2 and the fourth lens L4 are aspheric mirrors.
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 L7 disposed on the image side of the sixth lens L6, and a protective glass L8 disposed between the filter L7 and the image plane S17.
Fig. 2 is a spherical aberration (mm), astigmatism (mm), and distortion map (%) of the optical imaging system 10 in the first embodiment, in which the astigmatism map and the distortion map are data maps at a reference wavelength of 750.000 nm.
In the first embodiment, the maximum field angle FOV of the optical imaging system 10 is 149.0 °, the f-number FNO is 2.3, the focal length f is 2.89mm, f123/f is-9.94, R1/f is 3.59, f2/CT2 is-5.88, sags3/sags4 is-1.22, f4/f is 3.91, Imgh/epd is 5.59, and tan (1/2 FOV)/f is 10.42mm-1，TTL/ΣCT＝2.11。
Further, in the first embodiment, 1/(n)i486-ni950) The refractive index difference of the corresponding lenses at the wavelength of 950nm and the wavelength of 486nm is specifically as follows: 1/(n)1486-n1950)＝44.07，1/(n2486-n2950)＝36.51，1/(n3486-n3950)＝20.51，1/(n4486-n4950)＝42.74，1/(n5486-n5950)＝41.15，1/(n6486-n6950)＝10.79。
The reference wavelength of the focal length in the first embodiment is 750.000nm, 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 maximum 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 L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 with negative refractive power. The fifth lens L5 and the sixth lens L6 are of a cemented structure, and the fifth lens L5 and the sixth lens L6 have a positive bending force as a whole.
The object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is concave at the paraxial region, and the image-side surface S4 is convex at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 is convex at the paraxial region; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region thereof, and the image-side surface S8 is convex at the paraxial region thereof; the object-side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S10 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image-side surface S12 is convex at the paraxial region.
Further, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of glass.
Furthermore, the first lens L1, the third lens L3, the fifth lens L5 and the sixth lens L6 are all spherical mirrors, and the second lens L2 and the fourth lens L4 are aspheric mirrors.
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 L7 disposed on the image side of the sixth lens L6, and a protective glass L8 disposed between the filter L7 and the image plane S17.
Fig. 4 is a spherical aberration (mm), astigmatism (mm), and distortion map (%) of the optical imaging system 10 in the second embodiment, in which the astigmatism map and the distortion map are data maps at a reference wavelength of 750.000 nm.
In the second embodiment, the maximum field angle FOV of the optical imaging system 10 is 148.0 °, the f-number FNO is 2.3, the focal length f is 2.80mm, f123/f is-10.81, R1/f is 3.54, f2/CT2 is-5.74, sags3/sags4 is-1.30, f4/f is 4.03, Imgh/epd is 5.56, and tan (1/2) FOV/f is 9.76mm-1，TTL/ΣCT＝2.09。
Further, in the second embodiment, 1/(n)i486-ni950) The refractive index difference of the corresponding lenses at the wavelength of 950nm and the wavelength of 486nm is specifically as follows: 1/(n)1486-n1950)＝44.16，1/(n2486-n2950)＝36.15，1/(n3486-n3950)＝20.56，1/(n4486-n4950)＝46.79，1/(n5486-n5950)＝39.98，1/(n6486-n6950)＝11.10。
The reference wavelength of the focal length in the second embodiment is 750.000nm, 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 maximum 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 L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 with negative refractive power. The fifth lens L5 and the sixth lens L6 are of a cemented structure, and the fifth lens L5 and the sixth lens L6 have a positive bending force as a whole.
The object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is concave at the paraxial region, and the image-side surface S4 is convex at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 is convex at the paraxial region; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region thereof, and the image-side surface S8 is convex at the paraxial region thereof; the object-side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S10 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image-side surface S12 is convex at the paraxial region.
Further, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of glass.
Furthermore, the first lens L1, the third lens L3, the fifth lens L5 and the sixth lens L6 are all spherical mirrors, and the second lens L2 and the fourth lens L4 are aspheric mirrors.
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 L7 disposed on the image side of the sixth lens L6, and a protective glass L8 disposed between the filter L7 and the image plane S17.
Fig. 6 is a spherical aberration (mm), astigmatism (mm), and distortion map (%) of the optical imaging system 10 in the third embodiment, in which the astigmatism map and the distortion map are data maps at a reference wavelength of 750.000 nm.
In the third embodiment, the maximum field angle FOV of the optical imaging system 10 is 160.0 °, the f-number FNO is 2.3, the focal length f is 2.79mm, f123/f is-10.86, R1/f is 3.55, f2/CT2 is-5.74, sags3/sags4 is-1.21, f4/f is 4.04, Imgh/epd is 5.88, tan (1/2) FOV/f is 9.73mm-1，TTL/ΣCT＝2.09。
Further, in the third embodiment, 1/(n)i486-ni950) Corresponding to a plurality of lensesThe refractive index difference between the positions with the wavelength of 950nm and the wavelength of 486nm is specifically as follows: 1/(n)1486-n1950)＝44.18，1/(n2486-n2950)＝36.21，1/(n3486-n3950)＝20.53，1/(n4486-n4950)＝46.69，1/(n5486-n5950)＝40.26，1/(n6486-n6950)＝11.07。
The reference wavelength of the focal length in the third embodiment is 750.000nm, 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 maximum 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 L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 with negative refractive power. The fifth lens L5 and the sixth lens L6 are of a cemented structure, and the fifth lens L5 and the sixth lens L6 have a positive bending force as a whole.
The object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is concave at the paraxial region, and the image-side surface S4 is convex at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 is convex at the paraxial region; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region thereof, and the image-side surface S8 is convex at the paraxial region thereof; the object-side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S10 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image-side surface S12 is convex at the paraxial region.
Further, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of glass.
Furthermore, the first lens L1, the third lens L3, the fifth lens L5 and the sixth lens L6 are all spherical mirrors, and the second lens L2 and the fourth lens L4 are aspheric mirrors.
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 L7 disposed on the image side of the sixth lens L6, and a protective glass L8 disposed between the filter L7 and the image plane S17.
Fig. 8 is a spherical aberration (mm), astigmatism (mm), and distortion map (%) of the optical imaging system 10 in the fourth embodiment, in which the astigmatism map and the distortion map are data maps at a reference wavelength of 750.000 nm.
In the fourth embodiment, the maximum field angle FOV of the optical imaging system 10 is 148.0 °, the f-number FNO is 2.3, the focal length f is 2.78mm, f123/f is-10.99, R1/f is 3.57, f2/CT2 is-5.74, sags3/sags4 is-1.31, f4/f is 4.05, Imgh/epd is 5.56, tan (1/2) FOV/f is 9.70mm-1，TTL/ΣCT＝2.09。
Further, in the fourth embodiment, 1/(n)i486-ni950) The refractive index difference of the corresponding lenses at the wavelength of 950nm and the wavelength of 486nm is specifically as follows: 1/(n)1486-n1950)＝44.18，1/(n2486-n2950)＝36.22，1/(n3486-n3950)＝20.53，1/(n4486-n4950)＝46.75，1/(n5486-n5950)＝40.11，1/(n6486-n6950)＝11.09。
The reference wavelength of the focal length in the fourth embodiment is 750.000nm, 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 maximum 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 L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 with negative refractive power. The fifth lens L5 and the sixth lens L6 are of a cemented structure, and the fifth lens L5 and the sixth lens L6 have a positive bending force as a whole.
The object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is concave at the paraxial region, and the image-side surface S4 is convex at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 is convex at the paraxial region; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region thereof, and the image-side surface S8 is convex at the paraxial region thereof; the object-side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S10 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image-side surface S12 is convex at the paraxial region.
Further, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of glass.
Furthermore, the first lens L1, the third lens L3, the fifth lens L5 and the sixth lens L6 are all spherical mirrors, and the second lens L2 and the fourth lens L4 are aspheric mirrors.
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 L7 disposed on the image side of the sixth lens L6, and a protective glass L8 disposed between the filter L7 and the image plane S17.
Fig. 10 is a spherical aberration (mm), astigmatism (mm), and distortion map (%) of the optical imaging system 10 in the fifth embodiment, in which the astigmatism map and the distortion map are data maps at a reference wavelength of 750.000 nm.
In the fifth embodiment, the maximum field angle FOV of the optical imaging system 10 is 148.0 °, the f-number FNO is 2.3, the focal length f is 2.77mm, f123/f is-12.90, R1/f is 3.58, f2/CT2 is-5.75, sags3/sags4 is-1.33, f4/f is 4.07, Imgh/epd is 5.55, and tan (1/2) FOV/f is 9.66mm-1，TTL/ΣCT＝2.08。
Further, in the fifth embodiment, 1/(n)i486-ni950) The refractive index difference of the corresponding lenses at the wavelength of 950nm and the wavelength of 486nm is specifically as follows: 1/(n)1486-n1950)＝44.19，1/(n2486-n2950)＝36.23，1/(n3486-n3950)＝20.52，1/(n4486-n4950)＝46.93，1/(n5486-n5950)＝40.04，1/(n5486-n5950)＝10.95。
The focal length reference wavelength in the fifth embodiment is 750.000nm, 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 maximum field angle of the optical imaging system 10.
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 of the embodiment of the invention includes the optical imaging system 10, and the optical imaging system 10 reasonably configures the bending force of the internal lens and defines the refractive index difference of at least one lens at different wavelengths, thereby meeting the requirement of the image capturing module 100 for day and night confocal imaging. The image capturing module 100 also has better imaging capability in dark environments such as night, tunnel, mine hole, underground parking lot and the like through the optical imaging system 10.
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 electronic device 200 of the embodiment of the invention comprises the image capturing module 100, and the imaging quality of the optical imaging system 10 can be improved through reasonable configuration of the bending force, so that the requirement of the electronic device 200 on day-night confocal imaging is met, and the electronic device can have better imaging capability in environments with dark light such as night, tunnels, mine caves, underground parking lots and the like.
Referring to fig. 13, an automobile 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 automobile 300 according to the embodiment of the present invention includes, but is not limited to, manually driven or automatically driven vehicles such as a minibus, a minivan, a large bus, a large truck, a forklift, a bulldozer, and the like.
The automobile 300 provided by the embodiment of the invention comprises the image capturing module 100, and the imaging quality of the optical imaging system 10 can be improved through reasonable configuration of the bending force, so that the requirement of the automobile 300 on day-night confocal imaging is met, and the automobile 300 can have better imaging capability in dark environments such as night, tunnels, mine caves, underground parking lots and the like.
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 (13)
1. An optical imaging system, comprising, in order from an object side to an image side:
a first lens having a negative bending force;
a second lens having a negative bending force;
a third lens having a positive refracting power;
a fourth lens having a positive refracting power;
a fifth lens having a positive refracting power;
a sixth lens having a negative refracting power;
at least one lens of the optical imaging system satisfies the following conditional expression:
1/(ni486-ni950)≤30；
wherein, 1/(n)i486-ni950) Is the difference between the refractive index of the i-th lens at 486nm reference light and the refractive index of the i-th lens at 950nm reference light.
2. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
-13<f123/f<-8；
wherein f123 is a combined focal length of the first lens, the second lens and the third lens, and f is a focal length of the optical imaging system.
3. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
2<R1/f<4；
wherein R1 is a radius of curvature of the object-side surface of the first lens at the optical axis, and f is a focal length of the optical imaging system.
4. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
-6<f2/CT2<-4；
wherein f2 is the focal length of the second lens, and CT2 is the thickness of the second lens on the optical axis.
5. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
-1.5<sags3/sags4<-1.1；
wherein sags3 is the saggital height of the second lens object side optically effective diameter edge and sags4 is the saggital height of the second lens image side optically effective diameter edge.
6. The optical imaging system of claim 1, wherein at least one lens of the optical imaging system satisfies the following conditional expression:
vdi≤25；
where vdi is the dispersion coefficient of the i-th lens under d-light.
7. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
2<f4/f<4.2；
wherein f4 is the focal length of the fourth lens, and f is the focal length of the optical imaging system.
8. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
5.3<Imgh/epd<6.0；
where Imgh is a vertical distance from a farthest point of an image formed by the optical imaging system to the optical axis, and epd is an entrance pupil diameter of the optical imaging system.
9. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
8mm-1<tan(1/2*FOV)/f＜11mm-1；
wherein FOV is the maximum field angle of the optical imaging system, and f is the focal length of the optical imaging system.
10. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
1.9<TTL/ΣCT<2.3；
wherein, TTL is a distance from an object-side surface of the first lens element to an image plane on an optical axis, and Σ CT is a sum of thicknesses of the respective lens elements of the optical imaging system on the optical axis.
11. An image capturing module, comprising:
the optical imaging system of any one of claims 1 to 10; and
the photosensitive element is arranged on the image side of the optical imaging system.
12. An electronic device, comprising:
a housing; and
the image capturing module as claimed in claim 11, wherein the image capturing module is mounted on the housing.
13. An automobile, comprising:
a body, and
the image capturing module as claimed in claim 11, wherein the image capturing module is mounted on the body.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113484988A (en) * | 2021-07-14 | 2021-10-08 | 天津欧菲光电有限公司 | Optical imaging system, image capturing module, electronic equipment and automobile |
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