WO2021174489A1 - Optical imaging system and image capturing device having same, and electronic device - Google Patents

Optical imaging system and image capturing device having same, and electronic device Download PDF

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Publication number
WO2021174489A1
WO2021174489A1 PCT/CN2020/078004 CN2020078004W WO2021174489A1 WO 2021174489 A1 WO2021174489 A1 WO 2021174489A1 CN 2020078004 W CN2020078004 W CN 2020078004W WO 2021174489 A1 WO2021174489 A1 WO 2021174489A1
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WO
WIPO (PCT)
Prior art keywords
lens
imaging system
optical
optical imaging
efl
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PCT/CN2020/078004
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French (fr)
Chinese (zh)
Inventor
蔡雄宇
兰宾利
赵迪
周芮
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天津欧菲光电有限公司
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Priority to PCT/CN2020/078004 priority Critical patent/WO2021174489A1/en
Publication of WO2021174489A1 publication Critical patent/WO2021174489A1/en

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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Definitions

  • the present disclosure relates to the field of optical imaging technology, and in particular, to an optical imaging system, an imaging device and an electronic device having the optical imaging system.
  • the telephoto lens has a long focal length, a small angle of view, and a large image on the film. Therefore, it can shoot a larger image at the same distance than a standard lens, which is suitable for shooting distant objects.
  • the front-view camera in the vehicle-mounted camera needs to observe longer-distance images. It provides the driver with a reference for the blind spot area outside the observable area of the human eye, so that the driver can grasp the road conditions ahead in real time during driving. Safe driving provides guarantee. Therefore, the front-view camera should use a longer focal length.
  • the existing telephoto lens such as the front-view camera in the vehicle-mounted camera, needs to capture the observation object at a long distance, and the overall pixel is difficult to guarantee.
  • an objective of the present disclosure is to provide an optical imaging system that can achieve high-definition shooting while achieving a long focal length.
  • Another objective of the present disclosure is to provide an imaging device with the above-mentioned optical imaging system.
  • Another objective of the present disclosure is to provide an electronic device having the above-mentioned image capturing device.
  • An optical imaging system includes: an optical lens group including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged along an axial direction ,
  • the sixth lens, the seventh lens and the eighth lens, the first lens, the second lens, the fifth lens, the sixth lens and the seventh lens all have positive refractive power
  • the The third lens, the fourth lens and the eighth lens all have negative refractive power.
  • the first lens, the second lens, the fifth lens, the sixth lens, and the seventh lens all have positive refractive power, so that the optical imaging system has sufficient converging ability to make optical imaging
  • the structure of the system is compact, and the total length of the optical lens group is prevented from being too long.
  • the third lens, the fourth lens and the eighth lens all have negative refractive power, the light with a large angle of view can enter the optical imaging system.
  • the configuration of the optical lens group is more reasonable, so that the optical imaging system can meet the long focal length, and at the same time, it is beneficial to realize the high pixelization of the optical lens group and improve the optical system.
  • the imaging quality of the imaging system is provided.
  • the object side of the second lens is convex at the optical axis
  • the image side of the second lens is concave at the optical axis
  • the object side of the third lens is at the optical axis.
  • Convex surface, the image side surface of the third lens is concave at the optical axis, and the second lens and the third lens are cemented with each other. Therefore, by cementing the second lens and the third lens with each other, the optical imaging system has a compact structure, which is conducive to the realization of a miniaturized design, and a balance is achieved in reducing the volume and improving the system resolution.
  • the object side surfaces of the second lens and the third lens convex on the optical axis and the image side surface on the optical axis concave, it is beneficial to correct the curvature of the image surface, reduce the sensitivity of assembly, and improve the resolution of the system.
  • the object side surface and the image side surface of the fourth lens are both concave at the optical axis
  • the object side surface and the image side surface of the fifth lens are both convex at the optical axis
  • the fourth lens And the fifth lens are cemented with each other. Therefore, by cementing the fourth lens and the fifth lens with each other, the structure of the optical imaging system can be made more compact, and a miniaturized design can be realized.
  • the object side surface of the fourth lens concave at the optical axis, it is advantageous to correct astigmatism.
  • the object side of the first lens is convex at the optical axis
  • the image side of the first lens is concave at the optical axis
  • the object side and image side of the sixth lens are at the optical axis.
  • the axis is convex
  • the object side of the seventh lens is convex at the optical axis
  • the image side of the seventh lens is flat or concave at the optical axis
  • the object side of the eighth lens is at the optical axis It is a concave surface
  • the image side surface of the eighth lens is convex or concave at the optical axis.
  • this arrangement can expand the angle of view.
  • this arrangement can expand the image side surface of the first lens concave at the optical axis, it is advantageous for peripheral light with a larger viewing angle to enter the optical lens group, thereby expanding the imaging range.
  • a filter film is provided on the object side or image side of one of the first lens to the eighth lens; or a filter film is provided between the image side and the imaging surface of the eighth lens.
  • the filter film is used to transmit visible light and cut off the infrared light band. Separate setting of the filter is beneficial to the assembly process of the lens system; setting the filter film on the lens surface is more conducive to maintaining the color balance of the image surface. Make the effect of taking pictures close to the human eye, and ensure the imaging effect of the optical imaging system.
  • the effective focal length of the optical lens group is EFL
  • the focal length of the first lens is f1, wherein the EFL and f1 satisfy: 0 ⁇ f1/EFL ⁇ 2. Therefore, since the first lens is the first lens from the object side to the image side of the optical imaging system, it provides a positive bending force for the optical imaging system. Therefore, a reasonable configuration of the focal length of the first lens is beneficial to correct the aberrations of the optical imaging system. , Improve system resolution and reduce system sensitivity.
  • the effective focal length of the optical lens group is EFL
  • the composite focal length of the second lens and the third lens is f23, where the EFL and f23 satisfy: -6 ⁇ f23/EFL ⁇ 0.
  • the effective focal length of the optical lens group is EFL
  • the combined focal length of the fourth lens and the fifth lens is f45
  • the EFL and f45 satisfy: -3.6 ⁇ f45/EFL ⁇ 0. Therefore, by setting -3.6 ⁇ f45/EFL ⁇ 0, the aberration of the optical lens group can be effectively balanced, which is beneficial to correct the curvature of the field, reduce the sensitivity of assembly, improve the resolution of the system, and improve the imaging quality of the entire optical imaging system.
  • the air separation distance between the sixth lens and the seventh lens on the optical axis is CT6, the focal length of the sixth lens is f6, and the focal length of the seventh lens is f7, where ,
  • the CT6, f6, and f7 satisfy: 1 ⁇ CT6/(1/f6+1/f7) ⁇ 25. Therefore, by setting 1 ⁇ CT6/(1/f6+1/f7) ⁇ 25, the sixth lens and the seventh lens provide positive refractive power to the system, which is beneficial to correct system aberrations, improve system resolution, and reduce sensitivity.
  • the air gap between the sixth lens and the seventh lens on the optical axis can be reasonably controlled, so that the optical imaging system can achieve a compact design while satisfying high pixels.
  • the effective focal length of the optical lens group is EFL
  • the focal length of the eighth lens is f8, where the EFL and f8 satisfy: -3 ⁇ f8/EFL ⁇ 0. Therefore, since the eighth lens is the last lens from the object side to the image side of the optical imaging system, it provides negative refractive power for the optical imaging system, which can strengthen the imaging ability of the optical lens group, and is used to correct the aberrations of the optical imaging system and reduce Temperature sensitivity, and the greater the absolute value of f8, the smaller the amount of back focus change caused by temperature, which is beneficial to avoid defocusing caused by temperature differences, improve image quality, and make the picture clearer.
  • the effective focal length of the optical lens group is EFL
  • the entrance pupil diameter of the optical imaging system is EPD
  • EFL/EPD ⁇ 1.7 the effective focal length of the optical lens group
  • the air separation distance between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis is ⁇ CT56
  • the total length of the optical imaging system is TTL, where ⁇ CT56 and TTL satisfy: 0 ⁇ CT56/TTL ⁇ 0.3.
  • the effective focal length of the optical lens group is EFL
  • the maximum field of view of the optical imaging system is FOV
  • the image height corresponding to the maximum field of view of the optical imaging system is Imgh
  • the EFL, FOV, and Imgh satisfy: 45 ⁇ (FOV ⁇ EFL)/Imgh ⁇ 70.
  • the radius of curvature of the object side surface of the eighth lens at the optical axis is R13
  • the focal length of the eighth lens is f8, where R13 and f8 satisfy: 0 ⁇ R13/f8 ⁇ 1. Therefore, by setting 0 ⁇ R13/f8 ⁇ 1, it is advantageous to control the degree of curvature of the eighth lens, which is used to correct aberrations and further reduce the generation rate of ghost images.
  • the radius of curvature of the image side surface of the fifth lens at the optical axis is R5
  • the radius of curvature of the object side surface of the sixth lens at the optical axis is R6, wherein the R5, R6 Satisfies: -7 ⁇ (R5+R6)/(R5-R6) ⁇ -3. Therefore, by making -7 ⁇ (R5+R6)/(R5-R6) ⁇ -3, the optical imaging system has a large viewing angle and a high definition at the same time, and the imaging quality is guaranteed.
  • the imaging device includes: an optical imaging system, the optical imaging system being the optical imaging system according to the embodiment of the first aspect of the present disclosure; a photosensitive element, the photosensitive element is provided in the The image side of the optical imaging system.
  • the imaging device of the embodiment of the present disclosure by adopting the above-mentioned optical imaging system, long focal length and high pixels can be satisfied at the same time, the imaging quality is high, and the overall performance of the imaging device is improved.
  • An electronic device includes: a housing with a through hole formed on the housing; , The image capturing device is installed at the through hole.
  • the electronic device of the embodiment of the present disclosure by adopting the above-mentioned image capturing device, the electronic device has the advantages of a long focal length and high pixels, and fully meets the needs of users.
  • Fig. 1 is a schematic structural diagram of an optical imaging system according to a first embodiment of the present disclosure
  • Fig. 2 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system shown in Fig. 1;
  • Fig. 3 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present disclosure.
  • FIG. 4 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system shown in FIG. 3;
  • Fig. 5 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present disclosure.
  • Fig. 6 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system shown in Fig. 5;
  • Fig. 7 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present disclosure.
  • Fig. 8 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system shown in Fig. 7;
  • FIG. 9 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present disclosure.
  • Fig. 10 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system shown in Fig. 9.
  • 1 the first lens
  • 2 the second lens
  • 3 the third lens
  • 4 the fourth lens
  • 5 the fifth lens
  • 6 the sixth lens
  • 7 the seventh lens
  • 8 eighth lens
  • 9 diaphragm
  • 10 filter
  • 11 protective glass
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features. Further, in the description of the present disclosure, unless otherwise specified, “plurality” means two or more than two.
  • FIGS. 1-10 an optical imaging system 100 according to an embodiment of the first aspect of the present disclosure will be described with reference to FIGS. 1-10.
  • the optical imaging system 100 includes an optical lens group.
  • the optical lens group includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and a second lens that are sequentially arranged along the axial direction.
  • Eight lens 8 The first lens 1, the second lens 2, the fifth lens 5, the sixth lens 6, and the seventh lens 7 all have positive refractive power, and the third lens 3, the fourth lens 4 and the eighth lens 8 all have negative refractive power.
  • the tortuous force means that the direction of propagation of the parallel light will be deflected when the parallel light passes through the optical imaging system, which is used to characterize the tortuous power of the optical imaging system to the incident parallel light beam.
  • the optical imaging system has a positive tortuous force, which indicates that the tortuosity of the light is convergent; the optical imaging system has a negative tortuous force, which indicates that the tortuous of the light is divergent.
  • the tortuous force or focal length of the lens does not define its area position, it means that the tortuous force or focal length of the lens is the tortuous force or focal length of the lens at the optical axis.
  • the first lens 1, the second lens 2, the fifth lens 5, the sixth lens 6, and the seventh lens 7 all have positive refractive power, so that the optical imaging system 100 has sufficient
  • the convergence capability of the optical imaging system 100 makes the structure of the optical imaging system 100 compact, and prevents the total length of the optical lens group from being too long.
  • the third lens 3, the fourth lens 4, and the eighth lens 8 have negative refractive power, the light with a large angle of view can enter the optical imaging system 100.
  • the first lens 1 to the eighth lens 8 are correspondingly Optimizing the setting makes the configuration of the optical lens group more reasonable, so that the optical imaging system 100 meets the long focal length, and at the same time, it is beneficial to realize the high pixelization of the optical lens group and improve the imaging quality of the optical imaging system 100.
  • the object side of the second lens 2 is convex at the optical axis, and the image side of the second lens 2 is at the optical axis. It is a concave surface, the object side surface of the third lens 3 is convex at the optical axis, the image side surface of the third lens 3 is concave at the optical axis, and the second lens 2 and the third lens 3 are cemented with each other.
  • the second lens 2 and the third lens 3 are cemented with each other to form a cemented structure, and the cemented structure is in the shape of a meniscus, and the cemented surface is convex toward the optical imaging The object side of the system 100. Therefore, by cementing the second lens 2 and the third lens 3 with each other, the optical imaging system 100 has a compact structure, which is beneficial to realize a miniaturized design, and achieves a balance between reducing the volume and improving the system resolution.
  • the object side surfaces of the second lens 2 and the third lens 3 convex on the optical axis and the image side surface concave on the optical axis, it is beneficial to correct the curvature of the field, reduce the sensitivity of assembly, and improve the resolution of the system.
  • the object side and the image side of the fourth lens 4 are both concave at the optical axis, and the object side of the fifth lens 5
  • the image side surface is convex at the optical axis, and the fourth lens 4 and the fifth lens 5 are cemented with each other. Therefore, by cementing the fourth lens 4 and the fifth lens 5 with each other, the structure of the optical imaging system 100 can be made more compact and a miniaturized design can be realized. Moreover, by making the object side surface of the fourth lens 4 concave at the optical axis, it is advantageous to correct astigmatism.
  • the object side of the first lens 1 is convex at the optical axis, and the image side of the first lens 1 is at the optical axis. It is concave.
  • the object side and image side of the sixth lens 6 are convex at the optical axis.
  • the object side of the seventh lens 7 is convex at the optical axis.
  • the image side of the seventh lens 7 is flat or concave at the optical axis.
  • the object side surface of the eighth lens 8 is concave at the optical axis, and the image side surface of the eighth lens 8 is convex or concave at the optical axis.
  • this arrangement can expand the angle of view.
  • the image side surface of the first lens 1 a concave surface at the optical axis, it is advantageous for peripheral light with a larger viewing angle to enter the optical lens group, so that the imaging range can be expanded.
  • one of the object side surface and the image side surface of the sixth lens 6 may be an aspheric surface.
  • the object side surface of the sixth lens 6 is an aspherical surface
  • the image side surface of the sixth lens 6 is a spherical surface.
  • This setting helps to obtain more control variables to reduce aberrations, improve the system's resolution, and make the system's imaging clearer.
  • the object side surface and the image side surface of the sixth lens 6 may both be spherical surfaces. It can be understood that the specific shape of the sixth lens 6 can be specifically set according to actual requirements to better meet actual applications.
  • one of the first lens 1 to the eighth lens 8 is provided with a filter film (not shown) on the object side or the image side.
  • the filter film may be an IR (Infrared Radiation, infrared) film, which can filter out infrared light and transmit visible light. Therefore, disposing the filter film on the surface of the lens is more conducive to maintaining the color balance of the image plane, so that the effect of taking pictures is close to that of the human eye, so that the imaging quality of the optical imaging system 100 can be improved.
  • a filter 10 is provided between the image side and the imaging surface of the eighth lens 8.
  • the filter 10 may be an IR plate. Therefore, by arranging the filter 10 on the image side of the eighth lens 8, the filter 10 can also filter out unwanted light in nature, so that the effect of taking pictures is close to that of the human eye, and the imaging effect of the optical imaging system 100 is ensured. And the separate arrangement of the filter 10 is beneficial to the assembly process of the optical lens group.
  • the effective focal length of the optical lens group is EFL
  • the focal length of the first lens 1 is f1, where EFL and f1 satisfy: 0 ⁇ f1/EFL ⁇ 2. Therefore, since the first lens 1 is the first lens element from the object side to the image side of the optical imaging system 100, it provides positive refractive power for the optical imaging system 100. Therefore, a reasonable configuration of the focal length of the first lens 1 is beneficial to correct optical imaging.
  • the aberration of the system 100 improves the resolution of the system and reduces the sensitivity of the system.
  • the effective focal length of the optical lens group is EFL
  • the combined focal length of the second lens 2 and the third lens 3 is f23, where EFL and f23 satisfy: -6 ⁇ f23/EFL ⁇ 0.
  • the second lens 2 and the third lens 3 are cemented to form a first cemented lens, the first cemented lens is meniscus-shaped, and the cemented surface is convex On the object side of the optical imaging system 100, the focal length of the first cemented lens is f23.
  • the spherical aberration and distortion of the optical imaging system 100 can be effectively balanced, and the curvature of the field can be corrected, and the sensitivity of assembly can be reduced. , Improve system resolution.
  • the effective focal length of the optical lens group is EFL
  • the combined focal length of the fourth lens 4 and the fifth lens 5 is f45, where EFL and f45 satisfy: -3.6 ⁇ f45/EFL ⁇ 0.
  • the fourth lens 4 and the fifth lens 5 are cemented with each other to form a second cemented lens, and the cemented surface is convex toward the object side of the optical imaging system 100,
  • the focal length of the second cemented lens is f45. Therefore, by setting -3.6 ⁇ f45/EFL ⁇ 0, the aberration of the optical lens group can be effectively balanced, which is beneficial to correct field curvature, reduce assembly sensitivity, improve system resolution, and improve the imaging of the entire optical imaging system 100 quality.
  • the air separation distance between the sixth lens 6 and the seventh lens 7 on the optical axis is CT6, the focal length of the sixth lens 6 is f6, and the focal length of the seventh lens 7 is f7, where CT6 , F6, f7 satisfy: 1 ⁇ CT6/(1/f6+1/f7) ⁇ 25. Therefore, by making 1 ⁇ CT6/(1/f6+1/f7) ⁇ 25, the sixth lens 6 and the seventh lens 7 provide positive tortuosity to the system, which is beneficial to correct system aberrations, improve system resolution and reduce sensitivity Spend. Moreover, with this arrangement, the air gap between the sixth lens 6 and the seventh lens 7 on the optical axis can be reasonably controlled, so that the optical imaging system 100 can achieve a compact design while satisfying high pixels.
  • the effective focal length of the optical lens group is EFL
  • the focal length of the eighth lens 8 is f8, where EFL and f8 satisfy: -3 ⁇ f8/EFL ⁇ 0. Therefore, since the eighth lens 8 is the last lens from the object side to the image side of the optical imaging system 100, it provides negative refractive power for the optical imaging system 100, which can strengthen the imaging capability of the optical lens group and be used to correct the optical imaging system 100. Aberrations reduce temperature sensitivity, and the larger the absolute value of f8, the smaller the amount of back focus change caused by temperature, which is beneficial to avoid defocusing caused by temperature differences, improve image quality, and make the picture clearer.
  • the effective focal length of the optical lens group is EFL
  • the entrance pupil diameter of the optical imaging system 100 is EPD
  • EFL and EPD satisfy: EFL/EPD ⁇ 1.7. Therefore, since the smaller the number of apertures, the greater the amount of light passing, and the greater the depth of field, such a setting is beneficial to increase the image perception of the optical imaging system 100, enhance the presentation ability of details, and can capture distant objects and make the imaging clearer.
  • the air separation distance between the image side surface of the third lens 3 and the object side surface of the fourth lens 4 on the optical axis is ⁇ CT56
  • the total length of the optical imaging system 100 is TTL, where ⁇ CT56 TTL satisfies: 0 ⁇ CT56/TTL ⁇ 0.3.
  • the effective focal length of the optical lens group is EFL
  • the maximum angle of view of the optical imaging system 100 is FOV
  • the image height corresponding to the maximum angle of view of the optical imaging system 100 is Imgh, where EFL, FOV and Imgh satisfy: 45 ⁇ (FOV ⁇ EFL)/Imgh ⁇ 70.
  • the maximum angle of view of the optical imaging system 100 refers to the angle of view of the optical imaging system 100 in the diagonal direction. Such a setting is beneficial to control the incident angle of light, correct aberrations, and improve the resolution of the system. Under the premise of ensuring that the optical imaging system 100 has high pixels, the shooting angle and field of view can be set reasonably, so that the optical imaging system 100 can be used for long focal length imaging. Device.
  • the radius of curvature of the object side surface of the eighth lens 8 at the optical axis is R13
  • the focal length of the eighth lens 8 is f8, where R13 and f8 satisfy: 0 ⁇ R13/f8 ⁇ 1. Therefore, by setting 0 ⁇ R13/f8 ⁇ 1, it is advantageous to control the degree of curvature of the eighth lens 8 for correcting aberrations and further reducing the generation rate of ghost images.
  • the radius of curvature of the image side surface of the fifth lens 5 at the optical axis is R5
  • the radius of curvature of the object side surface of the sixth lens 6 at the optical axis is R6, where R5 and R6 satisfy: -7 ⁇ (R5+R6)/(R5-R6) ⁇ -3.
  • R5 and R6 satisfy: -7 ⁇ (R5+R6)/(R5-R6) ⁇ -3.
  • R5 and R6 satisfy: -7 ⁇ (R5+R6)/(R5-R6) ⁇ -3.
  • R5 and R6 satisfy: -7 ⁇ (R5+R6)/(R5-R6) ⁇ -3.
  • the optical lens group further includes a diaphragm 9.
  • the diaphragm 9 is provided in the first lens 1 and the eighth lens 8. between.
  • the diaphragm 9 helps to reasonably control the angle of view of the optical imaging system 100, so that the system imaging is clearer.
  • the material of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 may be plastic or glass Wait.
  • the optical imaging can be reduced The weight of the system 100 and reduce the production cost; when the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8
  • the optical imaging system 100 has excellent optical performance and high temperature resistance.
  • the materials of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 can also be glass and plastic. Any combination, not necessarily all glass or all plastic.
  • optical imaging system 100 according to various embodiments of the present disclosure will be described below with reference to FIGS. 1 to 10.
  • the optical imaging system 100 includes a first lens 1, a second lens 2, a third lens 3, an aperture 9, a fourth lens 4, and a fifth lens in order from the object side to the image side.
  • a first lens 1 a second lens 2
  • a third lens 3 an aperture 9, a fourth lens 4, and a fifth lens in order from the object side to the image side.
  • FIG. 2 for the spherical aberration, astigmatism and distortion curves of the lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8, and the optical imaging system 100.
  • the first lens 1 to the eighth lens 8 have no inflection point on the object side and the image side
  • the first lens 1 to the eighth lens 8 are made of glass
  • the second lens 2 and the third lens 3 are cemented with each other.
  • the fourth lens 4 and the fifth lens 5 are cemented with each other.
  • the first lens 1 has a positive refractive power
  • the object side surface of the first lens 1 is a convex surface
  • the image side surface of the first lens 1 is a concave surface
  • both the object side surface and the image side surface of the first lens 1 are spherical surfaces.
  • the second lens 2 has a positive refractive power, the object side surface of the second lens 2 is a convex surface, the image side surface of the second lens 2 is a concave surface, and both the object side surface and the image side surface of the second lens 2 are spherical surfaces.
  • the third lens 3 has a negative refractive power, the object side surface of the third lens 3 is convex, the image side surface of the third lens 3 is concave, and both the object side surface and the image side surface of the third lens 3 are spherical surfaces.
  • the fourth lens 4 has a negative refractive power, the object side and the image side of the fourth lens 4 are both concave, and the object side and the image side of the fourth lens 4 are both spherical.
  • the fifth lens 5 has a positive bending force, the object side surface and the image side surface of the fifth lens 5 are both convex surfaces, and the object side surface and the image side surface of the fifth lens 5 are both spherical surfaces.
  • the sixth lens 6 has a positive refractive power, the object side surface and the image side surface of the sixth lens 6 are both convex surfaces, the object side surface of the sixth lens 6 is an aspheric surface, and the image side surface of the sixth lens 6 is a spherical surface.
  • the seventh lens 7 has a positive refractive power, the object side surface of the seventh lens 7 is convex, the image side surface of the seventh lens 7 is flat, and both the object side surface and the image side surface of the seventh lens 7 are spherical surfaces.
  • the eighth lens 8 has a negative refractive power, the object side surface of the eighth lens 8 is concave, the image side surface of the eighth lens 8 is convex, and both the object side surface and the image side surface of the eighth lens 8 are spherical surfaces.
  • the imaging surface is arranged on the image side of the eighth lens 8, an IR sheet and a protective glass 11 are arranged in sequence between the eighth lens 8 and the imaging surface.
  • the IR sheet is made of glass and does not affect the focal length, and the photosensitive element is arranged on the imaging surface.
  • the IR film will filter the imaging light entering the lens and filter out the infrared light.
  • the detailed optical data of the first embodiment is shown in Table 1, and the aspheric coefficients are shown in Table 2.
  • the units of the radius of curvature, thickness and focal length are millimeters, and the reference wavelength of the optical imaging system 100 is 546.074 nm.
  • the aspheric surface type formula is: z is the distance from the corresponding point on the aspheric surface to the plane tangent to the apex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric apex, k is the conic constant, and Ai is the aspheric surface type The coefficient corresponding to the higher-order item of the i-th term in the formula.
  • the effective focal length of the optical lens group is EFL
  • the focal length of the first lens 1 is f1
  • the composite focal length of the second lens 2 and the third lens 3 is f23
  • the fourth lens 4 and the fifth lens 5 are composite focal lengths.
  • the air separation distance between the sixth lens 6 and the seventh lens 7 is CT6, and the focal length of the sixth lens 6 is f6,
  • the distance between the image side surface of the third lens 3 and the object side surface of the fourth lens 4 on the optical axis is ⁇ CT56
  • the optical imaging system 100 can satisfy high-definition shooting while achieving a long focal length, and is conducive to the realization of a miniaturized design.
  • the structure of this embodiment is approximately the same as that of the first embodiment, wherein the same components use the same reference numerals, and the difference is that: the object side surface of the sixth lens 6 is a spherical surface, and the eighth lens The image side surface of 8 is a concave surface, and only a protective glass 11 is provided between the eighth lens 8 and the imaging surface, and there is no IR sheet.
  • the detailed optical data of the second embodiment is shown in Table 3.
  • the units of the radius of curvature, thickness and focal length are millimeters, and the reference wavelength of the optical imaging system 100 is 546.074 nm.
  • f1/EFL 1.47
  • f23/EFL -3.15
  • f45/EFL -2.10
  • CT6/(1/f6+1/f7) 1.05
  • f8/EFL -1.19
  • EFL/EPD 1.65
  • ⁇ CT56/TTL 0.19
  • (FOV ⁇ EFL)/Imgh 56.683
  • R13/f8 0.79
  • (R5+R6)/(R5-R6) -6.42.
  • optical imaging system 100 of this embodiment are similar to those of the optical imaging system 100 of the first embodiment, and therefore will not be described in detail here.
  • the structure of this embodiment is roughly the same as that of the second embodiment.
  • the same components are marked with the same reference numerals.
  • the difference is that the image side surface of the seventh lens 7 is concave, and the eighth lens has a concave surface.
  • the image side of 8 is convex.
  • the detailed optical data of the third embodiment is shown in Table 4.
  • the units of the radius of curvature, thickness and focal length are millimeters, and the reference wavelength of the optical imaging system 100 is 546.074 nm.
  • optical imaging system 100 of this embodiment is similar to that of the optical imaging system 100 of the second embodiment, so it will not be described in detail here.
  • the structure of this embodiment is roughly the same as that of the third embodiment, wherein the same components use the same reference numerals, and the difference is: the object side of the first lens 1 to the seventh lens 7 and The radius of curvature of the image side surface and the object side surface of the eighth lens 8 is different from that of the third embodiment.
  • the detailed optical data of the fourth embodiment is shown in Table 5.
  • the units of the radius of curvature, thickness and focal length are millimeters, and the reference wavelength of the optical imaging system 100 is 546.074 nm.
  • the structure of this embodiment is approximately the same as that of the fourth embodiment, wherein the same components are given the same reference numerals, and the difference is that the image side surface of the eighth lens 8 is concave.
  • the detailed optical data of the fifth embodiment is shown in Table 6.
  • the units of the radius of curvature, thickness and focal length are millimeters, and the reference wavelength of the optical imaging system 100 is 546.074 nm.
  • optical imaging system 100 of this embodiment is similar to that of the optical imaging system 100 of the fourth embodiment, so it will not be described in detail here.
  • An image capturing device (not shown in the figure) according to an embodiment of the second aspect of the present disclosure includes an optical imaging system 100 and a photosensitive element.
  • the optical imaging system 100 is the optical imaging system 100 according to the embodiment of the first aspect of the present disclosure, and the photosensitive element is provided on the image side of the optical imaging system 100.
  • the imaging device of the embodiment of the present disclosure by adopting the above-mentioned optical imaging system 100, long focal length and high pixels can be satisfied at the same time, the imaging quality is high, and the overall performance of the imaging device is improved.
  • An electronic device (not shown in the figure) according to an embodiment of the third aspect of the present disclosure includes a housing (not shown in the figure) and an image capturing device.
  • a through hole is formed on the housing, and the image capturing device is the image capturing device according to the embodiment of the second aspect of the present disclosure, and the image capturing device is installed at the through hole.
  • the electronic device of the embodiment of the present disclosure by adopting the above-mentioned image capturing device, the electronic device has the advantages of a long focal length and high pixels, and fully meets the needs of users.

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Abstract

An optical imaging system (100), comprising an optical lens group. The optical lens group comprises a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7), and an eighth lens (8) sequentially arranged in the axial direction. The first lens (1), the second lens (2), the fifth lens (5), the sixth lens (6), and the seventh lens (7) all have positive refractive power. The third lens (3), the fourth lens (4), and the eighth lens (8) all have negative refractive power.

Description

光学成像***和具有其的取像装置、电子装置Optical imaging system and imaging device and electronic device with same 技术领域Technical field
本公开涉及光学成像技术领域，具体而言，涉及一种光学成像***和具有其的取像装置、电子装置。The present disclosure relates to the field of optical imaging technology, and in particular, to an optical imaging system, an imaging device and an electronic device having the optical imaging system.
背景技术Background technique
相关技术中，长焦镜头的焦距长，视角小，在底片上成像大，因此在同一距离上能拍出比标准镜头更大的影像，适合拍摄远处的对象。例如，车载摄像头中的前视摄像头因其需要观察到较远距离的影像，就人眼可观测区域以外的盲点区域为驾驶员提供参考，使驾驶员在驾驶过程中能够实时掌握前方路况，为安全行驶提供保障。因此，前视摄像头应该使用较长焦距。然而，现有的长焦镜头例如车载摄像头中的前视摄像头因其需要远距离捕捉观察物体，整体像素难以得到保证。In the related technology, the telephoto lens has a long focal length, a small angle of view, and a large image on the film. Therefore, it can shoot a larger image at the same distance than a standard lens, which is suitable for shooting distant objects. For example, the front-view camera in the vehicle-mounted camera needs to observe longer-distance images. It provides the driver with a reference for the blind spot area outside the observable area of the human eye, so that the driver can grasp the road conditions ahead in real time during driving. Safe driving provides guarantee. Therefore, the front-view camera should use a longer focal length. However, the existing telephoto lens, such as the front-view camera in the vehicle-mounted camera, needs to capture the observation object at a long distance, and the overall pixel is difficult to guarantee.
发明内容Summary of the invention
本公开旨在至少解决现有技术中存在的技术问题之一。为此，本公开的一个目的在于提出一种光学成像***，所述光学成像***在实现长焦距的同时，可以满足高清晰拍摄。The present disclosure aims to solve at least one of the technical problems existing in the prior art. To this end, an objective of the present disclosure is to provide an optical imaging system that can achieve high-definition shooting while achieving a long focal length.
本公开的另一个目的在于提出一种具有上述光学成像***的取像装置。Another objective of the present disclosure is to provide an imaging device with the above-mentioned optical imaging system.
本公开的再一个目的在于提出一种具有上述取像装置的电子装置。Another objective of the present disclosure is to provide an electronic device having the above-mentioned image capturing device.
根据本公开第一方面实施例的光学成像***，包括：光学透镜组，所述光学透镜组包括沿轴向依次设置的第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜和第八透镜，所述第一透镜、所述第二透镜、所述第五透镜、所述第六透镜和所述第七透镜均具有正曲折力，所述第三透镜、所述第四透镜和所述第八透镜均具有负曲折力。An optical imaging system according to an embodiment of the first aspect of the present disclosure includes: an optical lens group including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged along an axial direction , The sixth lens, the seventh lens and the eighth lens, the first lens, the second lens, the fifth lens, the sixth lens and the seventh lens all have positive refractive power, the The third lens, the fourth lens and the eighth lens all have negative refractive power.
根据本公开实施例的光学成像***，通过使第一透镜、第二透镜、第五透镜、第六透镜和第七透镜均具有正曲折力，使光学成像***具有足够的汇聚能力，使光学成像***的结构紧凑，避免光学透镜组的总长过长。通过使第三透镜、第四透镜和第八透镜均具有负曲折力，使大视角的光线能够进入光学成像***。同时，通过对第一透镜至第八透镜进行相应的优化设置，使光学透镜组的配置较合理，使光学成像***满足长焦距的同时，有利于实现光学透镜组的高像素化，提高了光学成像***的成像质量。According to the optical imaging system of the embodiment of the present disclosure, the first lens, the second lens, the fifth lens, the sixth lens, and the seventh lens all have positive refractive power, so that the optical imaging system has sufficient converging ability to make optical imaging The structure of the system is compact, and the total length of the optical lens group is prevented from being too long. By making the third lens, the fourth lens and the eighth lens all have negative refractive power, the light with a large angle of view can enter the optical imaging system. At the same time, through the corresponding optimization settings of the first lens to the eighth lens, the configuration of the optical lens group is more reasonable, so that the optical imaging system can meet the long focal length, and at the same time, it is beneficial to realize the high pixelization of the optical lens group and improve the optical system. The imaging quality of the imaging system.
根据本公开的一些示例，所述第二透镜的物侧面于光轴处为凸面，所述第二透镜的像侧面于光轴处为凹面，所述第三透镜的物侧面于光轴处为凸面，所述第三透镜的像侧面于光轴处为凹面，所述第二透镜与所述第三透镜相互胶合。由此，通过使第二透镜和第三透镜相互胶合，使光学成像***结构紧凑，有利于实现小型化设计，在缩小体积和 提高***解像力上取得平衡。而且，通过使第二透镜和第三透镜的物侧面于光轴处为凸面且像侧面于光轴处为凹面，有利于校正像面弯曲，降低组装的敏感度，提升***解像力。According to some examples of the present disclosure, the object side of the second lens is convex at the optical axis, the image side of the second lens is concave at the optical axis, and the object side of the third lens is at the optical axis. Convex surface, the image side surface of the third lens is concave at the optical axis, and the second lens and the third lens are cemented with each other. Therefore, by cementing the second lens and the third lens with each other, the optical imaging system has a compact structure, which is conducive to the realization of a miniaturized design, and a balance is achieved in reducing the volume and improving the system resolution. Moreover, by making the object side surfaces of the second lens and the third lens convex on the optical axis and the image side surface on the optical axis concave, it is beneficial to correct the curvature of the image surface, reduce the sensitivity of assembly, and improve the resolution of the system.
根据本公开的一些示例，所述第四透镜的物侧面和像侧面于光轴处均为凹面，所述第五透镜的物侧面和像侧面于光轴处均为凸面，所述第四透镜和所述第五透镜相互胶合。由此，通过使第四透镜和第五透镜相互胶合，可以使光学成像***的结构更加紧凑，实现小型化设计。而且，通过使第四透镜的物侧面于光轴处为凹面，有利于像散的修正。According to some examples of the present disclosure, the object side surface and the image side surface of the fourth lens are both concave at the optical axis, the object side surface and the image side surface of the fifth lens are both convex at the optical axis, and the fourth lens And the fifth lens are cemented with each other. Therefore, by cementing the fourth lens and the fifth lens with each other, the structure of the optical imaging system can be made more compact, and a miniaturized design can be realized. Moreover, by making the object side surface of the fourth lens concave at the optical axis, it is advantageous to correct astigmatism.
根据本公开的一些示例，所述第一透镜的物侧面于光轴处为凸面，所述第一透镜的像侧面于光轴处为凹面，所述第六透镜的物侧面和像侧面于光轴处均为凸面，所述第七透镜的物侧面于光轴处为凸面，所述第七透镜的像侧面于光轴处为平面或凹面，所述第八透镜的物侧面于光轴处为凹面，所述第八透镜的像侧面于光轴处为凸面或凹面。由此，通过使第一透镜的物侧面于光轴处为凸面且第一透镜具有正曲折力，该设置可以扩大视场角。而且，通过使第一透镜的像侧面于光轴处为凹面，有利于视角较大的周边光线进入光学透镜组，从而可以扩大摄像范围。According to some examples of the present disclosure, the object side of the first lens is convex at the optical axis, the image side of the first lens is concave at the optical axis, and the object side and image side of the sixth lens are at the optical axis. The axis is convex, the object side of the seventh lens is convex at the optical axis, the image side of the seventh lens is flat or concave at the optical axis, and the object side of the eighth lens is at the optical axis It is a concave surface, and the image side surface of the eighth lens is convex or concave at the optical axis. Thus, by making the object side surface of the first lens convex at the optical axis and the first lens has a positive refractive power, this arrangement can expand the angle of view. Moreover, by making the image side surface of the first lens concave at the optical axis, it is advantageous for peripheral light with a larger viewing angle to enter the optical lens group, thereby expanding the imaging range.
根据本公开的一些示例，所述第一透镜至所述第八透镜中的其中一个透镜的物侧面或像侧面设有滤光膜；或所述第八透镜的像侧和成像面之间设有滤光片。滤光膜是用于透过可见光截止红外光波段，单独设置滤光片有利于透镜***的组装工艺；将滤光膜设置在透镜表面则更有利于保持像面色彩均衡。使得拍照的效果和人眼接近，保证光学成像***的成像效果。According to some examples of the present disclosure, a filter film is provided on the object side or image side of one of the first lens to the eighth lens; or a filter film is provided between the image side and the imaging surface of the eighth lens. There are filters. The filter film is used to transmit visible light and cut off the infrared light band. Separate setting of the filter is beneficial to the assembly process of the lens system; setting the filter film on the lens surface is more conducive to maintaining the color balance of the image surface. Make the effect of taking pictures close to the human eye, and ensure the imaging effect of the optical imaging system.
根据本公开的一些示例，所述光学透镜组的有效焦距为EFL，所述第一透镜的焦距为f1，其中，所述EFL、f1满足：0＜f1/EFL＜2。由此，由于第一透镜为光学成像***物侧至像侧的第一片镜片，为光学成像***提供正曲折力，因此，合理配置第一透镜的焦距，有利于校正光学成像***的像差、提升***解像力，降低***敏感度。According to some examples of the present disclosure, the effective focal length of the optical lens group is EFL, and the focal length of the first lens is f1, wherein the EFL and f1 satisfy: 0<f1/EFL<2. Therefore, since the first lens is the first lens from the object side to the image side of the optical imaging system, it provides a positive bending force for the optical imaging system. Therefore, a reasonable configuration of the focal length of the first lens is beneficial to correct the aberrations of the optical imaging system. , Improve system resolution and reduce system sensitivity.
根据本公开的一些示例，所述光学透镜组的有效焦距为EFL，所述第二透镜和所述第三透镜的合成焦距为f23，其中，所述EFL、f23满足：-6＜f23/EFL＜0。如此，通过约束第二透镜和第三透镜的合成焦距与光学透镜组的有效焦距，可有效平衡光学成像***的球差和畸变，且有利于校正像面弯曲，降低组装的敏感度，提升***解像力。According to some examples of the present disclosure, the effective focal length of the optical lens group is EFL, and the composite focal length of the second lens and the third lens is f23, where the EFL and f23 satisfy: -6<f23/EFL <0. In this way, by constraining the combined focal length of the second lens and the third lens and the effective focal length of the optical lens group, the spherical aberration and distortion of the optical imaging system can be effectively balanced, and the curvature of the field can be corrected, reducing the sensitivity of assembly, and improving the system Resolution.
根据本公开的一些示例，所述光学透镜组的有效焦距为EFL，所述第四透镜和所述第五透镜合成焦距为f45，其中，所述EFL、f45满足：-3.6＜f45/EFL＜0。由此，通过使-3.6＜f45/EFL＜0，可以有效平衡光学透镜组的像差，有利于校正像面弯曲，降低组装的敏感度，提升***解像力，从而提高整个光学成像***的成像质量。According to some examples of the present disclosure, the effective focal length of the optical lens group is EFL, and the combined focal length of the fourth lens and the fifth lens is f45, where the EFL and f45 satisfy: -3.6<f45/EFL< 0. Therefore, by setting -3.6<f45/EFL<0, the aberration of the optical lens group can be effectively balanced, which is beneficial to correct the curvature of the field, reduce the sensitivity of assembly, improve the resolution of the system, and improve the imaging quality of the entire optical imaging system. .
根据本公开的一些示例，所述第六透镜和所述第七透镜于光轴上的空气间隔距离为CT6,所述第六透镜的焦距为f6,所述第七透镜的焦距为f7，其中，所述CT6、f6、f7满足：1＜CT6/(1/f6+1/f7)＜25。由此，通过使1＜CT6/(1/f6+1/f7)＜25，第六透镜和第七透镜为***提供正曲折力，有利于校正***像差、提升***解像力和降低敏感度。而且，如此设置，可以对第六透镜和所述第七透镜于光轴上的空气间隔进行合理 控制，使光学成像***在满足高像素的同时，实现小型化设计。According to some examples of the present disclosure, the air separation distance between the sixth lens and the seventh lens on the optical axis is CT6, the focal length of the sixth lens is f6, and the focal length of the seventh lens is f7, where , The CT6, f6, and f7 satisfy: 1<CT6/(1/f6+1/f7)<25. Therefore, by setting 1<CT6/(1/f6+1/f7)<25, the sixth lens and the seventh lens provide positive refractive power to the system, which is beneficial to correct system aberrations, improve system resolution, and reduce sensitivity. Moreover, with this arrangement, the air gap between the sixth lens and the seventh lens on the optical axis can be reasonably controlled, so that the optical imaging system can achieve a compact design while satisfying high pixels.
根据本公开的一些示例，所述光学透镜组的有效焦距为EFL，所述第八透镜的焦距为f8，其中，所述EFL、f8满足：-3＜f8/EFL＜0。由此，由于第八透镜为光学成像***物侧至像侧的最后一片透镜，为光学成像***提供负曲折力，可以强化光学透镜组的成像能力，用于校正光学成像***的像差，降低温度敏感度，且f8绝对值越大，由温度引起的后焦变化量则越小，有利于避免因温度差异而造成的离焦现象，提升成像质量，使画面更清晰。According to some examples of the present disclosure, the effective focal length of the optical lens group is EFL, and the focal length of the eighth lens is f8, where the EFL and f8 satisfy: -3<f8/EFL<0. Therefore, since the eighth lens is the last lens from the object side to the image side of the optical imaging system, it provides negative refractive power for the optical imaging system, which can strengthen the imaging ability of the optical lens group, and is used to correct the aberrations of the optical imaging system and reduce Temperature sensitivity, and the greater the absolute value of f8, the smaller the amount of back focus change caused by temperature, which is beneficial to avoid defocusing caused by temperature differences, improve image quality, and make the picture clearer.
根据本公开的一些示例，所述光学透镜组的有效焦距为EFL，所述光学成像***的入瞳直径为EPD，其中，所述EFL、EPD满足：EFL/EPD＜1.7。由此，由于光圈数越小，通光量越大，景深越大，如此设置有利于增加光学成像***的画面感，增强细节的呈现能力，可捕捉远距离物体，使成像更清晰。According to some examples of the present disclosure, the effective focal length of the optical lens group is EFL, and the entrance pupil diameter of the optical imaging system is EPD, where the EFL and EPD satisfy: EFL/EPD<1.7. Therefore, since the smaller the number of apertures, the greater the amount of light passing, and the greater the depth of field, this setting is beneficial to increase the image perception of the optical imaging system, enhance the presentation ability of details, and can capture distant objects and make the image clearer.
根据本公开的一些示例，所述第三透镜的像侧面与第四透镜的物侧面于光轴上的空气间隔距离为∑CT56，所述光学成像***的总长度为TTL，其中，所述∑CT56、TTL满足：0＜∑CT56/TTL＜0.3。如此，通过对第三透镜和第四透镜的空气间隔的控制，可以有效缩短光学成像***的总长度，且可以校正像差，提升光学成像***的解像力。According to some examples of the present disclosure, the air separation distance between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis is ΣCT56, and the total length of the optical imaging system is TTL, where Σ CT56 and TTL satisfy: 0＜∑CT56/TTL＜0.3. In this way, by controlling the air gap between the third lens and the fourth lens, the total length of the optical imaging system can be effectively shortened, aberrations can be corrected, and the resolution of the optical imaging system can be improved.
根据本公开的一些示例，所述光学透镜组的有效焦距为EFL，所述光学成像***的最大视场角为FOV，所述光学成像***的最大视场角对应的像高为Imgh，其中，所述EFL、FOV、Imgh满足：45≤(FOV×EFL)/Imgh≤70。如此设置，有利于控制光线的入射角度，校正像差，提升***解像力，保证光学成像***具有高像素的前提下,将拍摄角度与视场合理设置，使光学成像***可用于长焦距成像装置。According to some examples of the present disclosure, the effective focal length of the optical lens group is EFL, the maximum field of view of the optical imaging system is FOV, and the image height corresponding to the maximum field of view of the optical imaging system is Imgh, where, The EFL, FOV, and Imgh satisfy: 45≤(FOV×EFL)/Imgh≤70. Such a setting is beneficial to control the incident angle of light, correct aberrations, improve the system's resolution, and ensure that the optical imaging system has high pixels, and the shooting angle and field of view are reasonably set, so that the optical imaging system can be used for long focal length imaging devices.
根据本公开的一些示例，所述第八透镜的物侧面于光轴处的曲率半径为R13，所述第八透镜的焦距为f8，其中，所述R13、f8满足：0＜R13/f8＜1。由此，通过使0＜R13/f8＜1，有利于控制第八透镜的弯曲程度，用于校正像差，进一步降低鬼影的产生比率。According to some examples of the present disclosure, the radius of curvature of the object side surface of the eighth lens at the optical axis is R13, and the focal length of the eighth lens is f8, where R13 and f8 satisfy: 0<R13/f8< 1. Therefore, by setting 0<R13/f8<1, it is advantageous to control the degree of curvature of the eighth lens, which is used to correct aberrations and further reduce the generation rate of ghost images.
根据本公开的一些示例，所述第五透镜的像侧面于光轴处的曲率半径为R5，所述第六透镜的物侧面于光轴处的曲率半径为R6，其中，所述R5、R6满足：-7＜(R5+R6)/(R5-R6)＜-3。由此，通过使-7＜(R5+R6)/(R5-R6)＜-3，使光学成像***同时具有大视角和较高的清晰度，保证成像质量。According to some examples of the present disclosure, the radius of curvature of the image side surface of the fifth lens at the optical axis is R5, and the radius of curvature of the object side surface of the sixth lens at the optical axis is R6, wherein the R5, R6 Satisfies: -7<(R5+R6)/(R5-R6)<-3. Therefore, by making -7<(R5+R6)/(R5-R6)<-3, the optical imaging system has a large viewing angle and a high definition at the same time, and the imaging quality is guaranteed.
根据本公开第二方面实施例的取像装置，包括：光学成像***，所述光学成像***为根据本公开上述第一方面实施例的光学成像***；感光元件，所述感光元件设在所述光学成像***的像侧。The imaging device according to the embodiment of the second aspect of the present disclosure includes: an optical imaging system, the optical imaging system being the optical imaging system according to the embodiment of the first aspect of the present disclosure; a photosensitive element, the photosensitive element is provided in the The image side of the optical imaging system.
根据本公开实施例的取像装置，通过采用上述光学成像***，可以同时满足长焦距和高像素，成像质量较高，提升了取像装置整体的性能。According to the imaging device of the embodiment of the present disclosure, by adopting the above-mentioned optical imaging system, long focal length and high pixels can be satisfied at the same time, the imaging quality is high, and the overall performance of the imaging device is improved.
根据本公开第三方面实施例的电子装置，包括：壳体，所述壳体上形成有通孔；取像装置，所述取像装置为根据本公开上述第二方面实施例的取像装置，所述取像装置安装在所述通孔处。An electronic device according to an embodiment of the third aspect of the present disclosure includes: a housing with a through hole formed on the housing; , The image capturing device is installed at the through hole.
根据本公开实施例的电子装置，通过采用上述取像装置，使电子装置兼具长焦距与 高像素的优势，充分满足用户需求。According to the electronic device of the embodiment of the present disclosure, by adopting the above-mentioned image capturing device, the electronic device has the advantages of a long focal length and high pixels, and fully meets the needs of users.
本公开的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本公开的实践了解到。The additional aspects and advantages of the present disclosure will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present disclosure.
附图说明Description of the drawings
本公开的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：The above and/or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:
图1是根据本公开第一个实施例的光学成像***的结构示意图；Fig. 1 is a schematic structural diagram of an optical imaging system according to a first embodiment of the present disclosure;
图2是图1中所示的光学成像***的球差、像散和畸变曲线图；Fig. 2 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system shown in Fig. 1;
图3是根据本公开第二个实施例的光学成像***的结构示意图；Fig. 3 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present disclosure;
图4是图3中所示的光学成像***的球差、像散和畸变曲线图；4 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system shown in FIG. 3;
图5是根据本公开第三个实施例的光学成像***的结构示意图；Fig. 5 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present disclosure;
图6是图5中所示的光学成像***的球差、像散和畸变曲线图；Fig. 6 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system shown in Fig. 5;
图7是根据本公开第四个实施例的光学成像***的结构示意图；Fig. 7 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present disclosure;
图8是图7中所示的光学成像***的球差、像散和畸变曲线图；Fig. 8 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system shown in Fig. 7;
图9是根据本公开第五个实施例的光学成像***的结构示意图；FIG. 9 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present disclosure;
图10是图9中所示的光学成像***的球差、像散和畸变曲线图。Fig. 10 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system shown in Fig. 9.
附图标记：Reference signs:
100：光学成像***；100: Optical imaging system;
1：第一透镜；2：第二透镜；3：第三透镜；4：第四透镜；1: the first lens; 2: the second lens; 3: the third lens; 4: the fourth lens;
5：第五透镜；6：第六透镜；7：第七透镜；5: the fifth lens; 6: the sixth lens; 7: the seventh lens;
8：第八透镜；9：光阑；10：滤光片；11：保护玻璃。8: eighth lens; 9: diaphragm; 10: filter; 11: protective glass.
具体实施方式Detailed ways
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本公开，而不能理解为对本公开的限制。The embodiments of the present disclosure are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present disclosure, and cannot be understood as a limitation to the present disclosure.
在本公开的描述中，需要理解的是，术语“中心”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。In the description of the present disclosure, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying The device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure.
需要说明的是，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。进一步地，在本公开的描述中， 除非另有说明，“多个”的含义是两个或两个以上。It should be noted that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. Further, in the description of the present disclosure, unless otherwise specified, "plurality" means two or more than two.
下面参考图1-图10描述根据本公开第一方面实施例的光学成像***100。Hereinafter, an optical imaging system 100 according to an embodiment of the first aspect of the present disclosure will be described with reference to FIGS. 1-10.
如图1、图3、图5、图7和图9所示，根据本公开第一方面实施例的光学成像***100，包括光学透镜组。As shown in FIGS. 1, 3, 5, 7 and 9, the optical imaging system 100 according to the embodiment of the first aspect of the present disclosure includes an optical lens group.
具体而言，光学透镜组包括沿轴向依次设置的第一透镜1、第二透镜2、第三透镜3、第四透镜4、第五透镜5、第六透镜6、第七透镜7和第八透镜8。第一透镜1、第二透镜2、第五透镜5、第六透镜6和第七透镜7均具有正曲折力，第三透镜3、第四透镜4和第八透镜8均具有负曲折力。Specifically, the optical lens group includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and a second lens that are sequentially arranged along the axial direction. Eight lens 8. The first lens 1, the second lens 2, the fifth lens 5, the sixth lens 6, and the seventh lens 7 all have positive refractive power, and the third lens 3, the fourth lens 4 and the eighth lens 8 all have negative refractive power.
需要说明的是，曲折力是指平行光经过光学成像***，光线的传播方向会发生偏折，用于表征光学成像***对入射平行光束的曲折本领。光学成像***具有正曲折力，表明对光线的曲折是汇聚性的；光学成像***具有负曲折力，表明对光线的曲折是发散性的。在本公开提供的光学成像***100中，若透镜的曲折力或焦距未界定其区域位置时，则表示该透镜的曲折力或焦距为透镜于光轴处的曲折力或焦距。It should be noted that the tortuous force means that the direction of propagation of the parallel light will be deflected when the parallel light passes through the optical imaging system, which is used to characterize the tortuous power of the optical imaging system to the incident parallel light beam. The optical imaging system has a positive tortuous force, which indicates that the tortuosity of the light is convergent; the optical imaging system has a negative tortuous force, which indicates that the tortuous of the light is divergent. In the optical imaging system 100 provided in the present disclosure, if the tortuous force or focal length of the lens does not define its area position, it means that the tortuous force or focal length of the lens is the tortuous force or focal length of the lens at the optical axis.
根据本公开实施例的光学成像***100，通过使第一透镜1、第二透镜2、第五透镜5、第六透镜6和第七透镜7均具有正曲折力，使光学成像***100具有足够的汇聚能力，使光学成像***100的结构紧凑，避免光学透镜组的总长过长。通过使第三透镜3、第四透镜4和第八透镜8均具有负曲折力，使大视角的光线能够进入光学成像***100，同时，通过对第一透镜1至第八透镜8进行相应的优化设置，使光学透镜组的配置较合理，使光学成像***100满足长焦距的同时，有利于实现光学透镜组的高像素化，提高了光学成像***100的成像质量。According to the optical imaging system 100 of the embodiment of the present disclosure, the first lens 1, the second lens 2, the fifth lens 5, the sixth lens 6, and the seventh lens 7 all have positive refractive power, so that the optical imaging system 100 has sufficient The convergence capability of the optical imaging system 100 makes the structure of the optical imaging system 100 compact, and prevents the total length of the optical lens group from being too long. By making the third lens 3, the fourth lens 4, and the eighth lens 8 have negative refractive power, the light with a large angle of view can enter the optical imaging system 100. At the same time, the first lens 1 to the eighth lens 8 are correspondingly Optimizing the setting makes the configuration of the optical lens group more reasonable, so that the optical imaging system 100 meets the long focal length, and at the same time, it is beneficial to realize the high pixelization of the optical lens group and improve the imaging quality of the optical imaging system 100.
在本公开的一些实施例中，参照图1、图3、图5、图7和图9，第二透镜2的物侧面于光轴处为凸面，第二透镜2的像侧面于光轴处为凹面，第三透镜3的物侧面于光轴处为凸面，第三透镜3的像侧面于光轴处为凹面，第二透镜2与第三透镜3相互胶合。例如，在图1、图3、图5、图7和图9的示例中，第二透镜2与第三透镜3相互胶合形成胶合结构，且胶合结构呈弯月形，胶合面凸向光学成像***100的物侧。由此，通过使第二透镜2和第三透镜3相互胶合，使光学成像***100结构紧凑，有利于实现小型化设计，在缩小体积和提高***解像力上取得平衡。而且，通过使第二透镜2和第三透镜3的物侧面于光轴处为凸面且像侧面于光轴处为凹面，有利于校正像面弯曲，降低组装的敏感度，提升***解像力。In some embodiments of the present disclosure, referring to FIGS. 1, 3, 5, 7 and 9, the object side of the second lens 2 is convex at the optical axis, and the image side of the second lens 2 is at the optical axis. It is a concave surface, the object side surface of the third lens 3 is convex at the optical axis, the image side surface of the third lens 3 is concave at the optical axis, and the second lens 2 and the third lens 3 are cemented with each other. For example, in the examples of Figure 1, Figure 3, Figure 5, Figure 7 and Figure 9, the second lens 2 and the third lens 3 are cemented with each other to form a cemented structure, and the cemented structure is in the shape of a meniscus, and the cemented surface is convex toward the optical imaging The object side of the system 100. Therefore, by cementing the second lens 2 and the third lens 3 with each other, the optical imaging system 100 has a compact structure, which is beneficial to realize a miniaturized design, and achieves a balance between reducing the volume and improving the system resolution. Moreover, by making the object side surfaces of the second lens 2 and the third lens 3 convex on the optical axis and the image side surface concave on the optical axis, it is beneficial to correct the curvature of the field, reduce the sensitivity of assembly, and improve the resolution of the system.
在本公开的一些实施例中，结合图1、图3、图5、图7和图9，第四透镜4的物侧面和像侧面于光轴处均为凹面，第五透镜5的物侧面和像侧面于光轴处均为凸面，第四透镜4和第五透镜5相互胶合。由此，通过使第四透镜4和第五透镜5相互胶合，可以使光学成像***100的结构更加紧凑，实现小型化设计。而且，通过使第四透镜4的物侧面于光轴处为凹面，有利于像散的修正。In some embodiments of the present disclosure, with reference to FIGS. 1, 3, 5, 7 and 9, the object side and the image side of the fourth lens 4 are both concave at the optical axis, and the object side of the fifth lens 5 The image side surface is convex at the optical axis, and the fourth lens 4 and the fifth lens 5 are cemented with each other. Therefore, by cementing the fourth lens 4 and the fifth lens 5 with each other, the structure of the optical imaging system 100 can be made more compact and a miniaturized design can be realized. Moreover, by making the object side surface of the fourth lens 4 concave at the optical axis, it is advantageous to correct astigmatism.
在本公开的一些实施例中，参照图1、图3、图5、图7和图9，第一透镜1的物侧面于光轴处为凸面，第一透镜1的像侧面于光轴处为凹面，第六透镜6的物侧面和像侧 面于光轴处均为凸面，第七透镜7的物侧面于光轴处为凸面，第七透镜7的像侧面于光轴处为平面或凹面，第八透镜8的物侧面于光轴处为凹面，第八透镜8的像侧面于光轴处为凸面或凹面。由此，通过使第一透镜1的物侧面于光轴处为凸面且第一透镜1具有正曲折力，该设置可以扩大视场角。而且，通过使第一透镜1的像侧面于光轴处为凹面，有利于视角较大的周边光线进入光学透镜组，从而可以扩大摄像范围。In some embodiments of the present disclosure, referring to FIGS. 1, 3, 5, 7 and 9, the object side of the first lens 1 is convex at the optical axis, and the image side of the first lens 1 is at the optical axis. It is concave. The object side and image side of the sixth lens 6 are convex at the optical axis. The object side of the seventh lens 7 is convex at the optical axis. The image side of the seventh lens 7 is flat or concave at the optical axis. The object side surface of the eighth lens 8 is concave at the optical axis, and the image side surface of the eighth lens 8 is convex or concave at the optical axis. Thus, by making the object side surface of the first lens 1 convex at the optical axis and the first lens 1 has a positive bending force, this arrangement can expand the angle of view. Moreover, by making the image side surface of the first lens 1 a concave surface at the optical axis, it is advantageous for peripheral light with a larger viewing angle to enter the optical lens group, so that the imaging range can be expanded.
可选地，参照图1，第六透镜6的物侧面和像侧面中的其中一面可以为非球面。例如，在图1的示例中，第六透镜6的物侧面为非球面，第六透镜6的像侧面为球面。如此设置，有利于获得较多的控制变数来消减像差，提升***解像力，使***成像更清晰。当然，第六透镜6的物侧面和像侧面也可以均为球面。可以理解的是，第六透镜6的具体形状可以根据实际要求具体设置，以更好地满足实际应用。Optionally, referring to FIG. 1, one of the object side surface and the image side surface of the sixth lens 6 may be an aspheric surface. For example, in the example of FIG. 1, the object side surface of the sixth lens 6 is an aspherical surface, and the image side surface of the sixth lens 6 is a spherical surface. This setting helps to obtain more control variables to reduce aberrations, improve the system's resolution, and make the system's imaging clearer. Of course, the object side surface and the image side surface of the sixth lens 6 may both be spherical surfaces. It can be understood that the specific shape of the sixth lens 6 can be specifically set according to actual requirements to better meet actual applications.
在本公开的一些可选实施例中，第一透镜1至第八透镜8中的其中一个透镜的物侧面或像侧面设有滤光膜(图未示出)。例如，滤光膜可以为IR(Infrared Radiation，红外线)膜，IR膜可以过滤掉红外光线，透过可见光线。由此，将滤光膜设置在透镜表面则更有利于保持像面色彩均衡，使得拍照的效果和人眼接近，从而可以提高光学成像***100的成像质量。In some optional embodiments of the present disclosure, one of the first lens 1 to the eighth lens 8 is provided with a filter film (not shown) on the object side or the image side. For example, the filter film may be an IR (Infrared Radiation, infrared) film, which can filter out infrared light and transmit visible light. Therefore, disposing the filter film on the surface of the lens is more conducive to maintaining the color balance of the image plane, so that the effect of taking pictures is close to that of the human eye, so that the imaging quality of the optical imaging system 100 can be improved.
当然，本公开不限于此，在本公开的另一些可选实施例中，第八透镜8的像侧和成像面之间设有滤光片10。例如，滤光片10可以为IR片。由此，通过在第八透镜8的像侧设置滤光片10，滤光片10同样可以过滤掉自然中不需要的光线，使得拍照的效果和人眼接近，保证光学成像***100的成像效果，且单独设置滤光片10有利于光学透镜组的组装工艺。Of course, the present disclosure is not limited to this. In other optional embodiments of the present disclosure, a filter 10 is provided between the image side and the imaging surface of the eighth lens 8. For example, the filter 10 may be an IR plate. Therefore, by arranging the filter 10 on the image side of the eighth lens 8, the filter 10 can also filter out unwanted light in nature, so that the effect of taking pictures is close to that of the human eye, and the imaging effect of the optical imaging system 100 is ensured. And the separate arrangement of the filter 10 is beneficial to the assembly process of the optical lens group.
在本公开的一些实施例中，光学透镜组的有效焦距为EFL，第一透镜1的焦距为f1，其中，EFL、f1满足：0＜f1/EFL＜2。由此，由于第一透镜1为光学成像***100物侧至像侧的第一片镜片，为光学成像***100提供正曲折力，因此，合理配置第一透镜1的焦距，有利于校正光学成像***100的像差、提升***解像力，降低***敏感度。In some embodiments of the present disclosure, the effective focal length of the optical lens group is EFL, and the focal length of the first lens 1 is f1, where EFL and f1 satisfy: 0<f1/EFL<2. Therefore, since the first lens 1 is the first lens element from the object side to the image side of the optical imaging system 100, it provides positive refractive power for the optical imaging system 100. Therefore, a reasonable configuration of the focal length of the first lens 1 is beneficial to correct optical imaging. The aberration of the system 100 improves the resolution of the system and reduces the sensitivity of the system.
在本公开的一些实施例中，光学透镜组的有效焦距为EFL，第二透镜2和第三透镜3的合成焦距为f23，其中，EFL、f23满足：-6＜f23/EFL＜0。例如，在图1、图3、图5、图7和图9的示例中，第二透镜2和第三透镜3胶合形成第一胶合透镜，第一胶合透镜呈弯月形，胶合面凸向光学成像***100的物侧，其中，第一胶合透镜的焦距为f23。如此，通过约束第二透镜2和第三透镜3的合成焦距与光学透镜组的有效焦距，可有效平衡光学成像***100的球差和畸变，且有利于校正像面弯曲，降低组装的敏感度，提升***解像力。In some embodiments of the present disclosure, the effective focal length of the optical lens group is EFL, and the combined focal length of the second lens 2 and the third lens 3 is f23, where EFL and f23 satisfy: -6<f23/EFL<0. For example, in the examples of Figures 1, 3, 5, 7 and 9, the second lens 2 and the third lens 3 are cemented to form a first cemented lens, the first cemented lens is meniscus-shaped, and the cemented surface is convex On the object side of the optical imaging system 100, the focal length of the first cemented lens is f23. In this way, by constraining the combined focal length of the second lens 2 and the third lens 3 and the effective focal length of the optical lens group, the spherical aberration and distortion of the optical imaging system 100 can be effectively balanced, and the curvature of the field can be corrected, and the sensitivity of assembly can be reduced. , Improve system resolution.
在本公开的一些实施例中，光学透镜组的有效焦距为EFL，第四透镜4和第五透镜5合成焦距为f45，其中，EFL、f45满足：-3.6＜f45/EFL＜0。例如，在图1、图3、图5、图7和图9的示例中，第四透镜4和第五透镜5相互胶合形成第二胶合透镜，胶合面凸向光学成像***100的物侧，第二胶合透镜的焦距为f45。由此，通过使-3.6＜f45/EFL＜0，可以有效平衡光学透镜组的像差，有利于校正像面弯曲，降低组装的敏感 度，提升***解像力，从而提高整个光学成像***100的成像质量。In some embodiments of the present disclosure, the effective focal length of the optical lens group is EFL, and the combined focal length of the fourth lens 4 and the fifth lens 5 is f45, where EFL and f45 satisfy: -3.6<f45/EFL<0. For example, in the examples of FIGS. 1, 3, 5, 7 and 9, the fourth lens 4 and the fifth lens 5 are cemented with each other to form a second cemented lens, and the cemented surface is convex toward the object side of the optical imaging system 100, The focal length of the second cemented lens is f45. Therefore, by setting -3.6<f45/EFL<0, the aberration of the optical lens group can be effectively balanced, which is beneficial to correct field curvature, reduce assembly sensitivity, improve system resolution, and improve the imaging of the entire optical imaging system 100 quality.
在本公开的一些实施例中，第六透镜6和第七透镜7于光轴上的空气间隔距离为CT6,第六透镜6的焦距为f6,第七透镜7的焦距为f7，其中，CT6、f6、f7满足：1＜CT6/(1/f6+1/f7)＜25。由此，通过使1＜CT6/(1/f6+1/f7)＜25，第六透镜6和第七透镜7为***提供正曲折力，有利于校正***像差、提升***解像力和降低敏感度。而且，如此设置，可以对第六透镜6和第七透镜7于光轴上的空气间隔进行合理控制，使光学成像***100在满足高像素的同时，实现小型化设计。In some embodiments of the present disclosure, the air separation distance between the sixth lens 6 and the seventh lens 7 on the optical axis is CT6, the focal length of the sixth lens 6 is f6, and the focal length of the seventh lens 7 is f7, where CT6 , F6, f7 satisfy: 1<CT6/(1/f6+1/f7)<25. Therefore, by making 1<CT6/(1/f6+1/f7)<25, the sixth lens 6 and the seventh lens 7 provide positive tortuosity to the system, which is beneficial to correct system aberrations, improve system resolution and reduce sensitivity Spend. Moreover, with this arrangement, the air gap between the sixth lens 6 and the seventh lens 7 on the optical axis can be reasonably controlled, so that the optical imaging system 100 can achieve a compact design while satisfying high pixels.
在本公开的一些实施例中，光学透镜组的有效焦距为EFL，第八透镜8的焦距为f8，其中，EFL、f8满足：-3＜f8/EFL＜0。由此，由于第八透镜8为光学成像***100物侧至像侧的最后一片透镜，为光学成像***100提供负曲折力，可以强化光学透镜组的成像能力，用于校正光学成像***100的像差，降低温度敏感度，且f8绝对值越大，由温度引起的后焦变化量则越小，有利于避免因温度差异而造成的离焦现象，提升成像质量，使画面更清晰。In some embodiments of the present disclosure, the effective focal length of the optical lens group is EFL, and the focal length of the eighth lens 8 is f8, where EFL and f8 satisfy: -3<f8/EFL<0. Therefore, since the eighth lens 8 is the last lens from the object side to the image side of the optical imaging system 100, it provides negative refractive power for the optical imaging system 100, which can strengthen the imaging capability of the optical lens group and be used to correct the optical imaging system 100. Aberrations reduce temperature sensitivity, and the larger the absolute value of f8, the smaller the amount of back focus change caused by temperature, which is beneficial to avoid defocusing caused by temperature differences, improve image quality, and make the picture clearer.
在本公开的一些实施例中，光学透镜组的有效焦距为EFL，光学成像***100的入瞳直径为EPD，其中，EFL、EPD满足：EFL/EPD＜1.7。由此，由于光圈数越小，通光量越大，景深越大，如此设置有利于增加光学成像***100的画面感，增强细节的呈现能力，可捕捉远距离物体，使成像更清晰。In some embodiments of the present disclosure, the effective focal length of the optical lens group is EFL, and the entrance pupil diameter of the optical imaging system 100 is EPD, where EFL and EPD satisfy: EFL/EPD<1.7. Therefore, since the smaller the number of apertures, the greater the amount of light passing, and the greater the depth of field, such a setting is beneficial to increase the image perception of the optical imaging system 100, enhance the presentation ability of details, and can capture distant objects and make the imaging clearer.
在本公开的一些实施例中，第三透镜3的像侧面与第四透镜4的物侧面于光轴上的空气间隔距离为∑CT56，光学成像***100的总长度为TTL，其中，∑CT56、TTL满足：0＜∑CT56/TTL＜0.3。如此，通过对第三透镜3和第四透镜4于光轴上的空气间隔的控制，可以有效缩短光学成像***100的总长度，且可以校正像差，提升光学成像***100的解像力。In some embodiments of the present disclosure, the air separation distance between the image side surface of the third lens 3 and the object side surface of the fourth lens 4 on the optical axis is ΣCT56, and the total length of the optical imaging system 100 is TTL, where ΣCT56 TTL satisfies: 0＜∑CT56/TTL＜0.3. In this way, by controlling the air gap between the third lens 3 and the fourth lens 4 on the optical axis, the total length of the optical imaging system 100 can be effectively shortened, aberrations can be corrected, and the resolution of the optical imaging system 100 can be improved.
在本公开的一些实施例中，光学透镜组的有效焦距为EFL，光学成像***100的最大视场角为FOV，光学成像***100的最大视场角对应的像高为Imgh，其中，EFL、FOV、Imgh满足：45≤(FOV×EFL)/Imgh≤70。需要说明的是，“光学成像***100的最大视场角”指光学成像***100的对角线方向的视场角。如此设置，有利于控制光线的入射角度，校正像差，提升***解像力，保证光学成像***100具有高像素的前提下,将拍摄角度与视场合理设置，使光学成像***100可用于长焦距成像装置。In some embodiments of the present disclosure, the effective focal length of the optical lens group is EFL, the maximum angle of view of the optical imaging system 100 is FOV, and the image height corresponding to the maximum angle of view of the optical imaging system 100 is Imgh, where EFL, FOV and Imgh satisfy: 45≤(FOV×EFL)/Imgh≤70. It should be noted that “the maximum angle of view of the optical imaging system 100” refers to the angle of view of the optical imaging system 100 in the diagonal direction. Such a setting is beneficial to control the incident angle of light, correct aberrations, and improve the resolution of the system. Under the premise of ensuring that the optical imaging system 100 has high pixels, the shooting angle and field of view can be set reasonably, so that the optical imaging system 100 can be used for long focal length imaging. Device.
在本公开的一些实施例中，第八透镜8的物侧面于光轴处的曲率半径为R13，第八透镜8的焦距为f8，其中，R13、f8满足：0＜R13/f8＜1。由此，通过使0＜R13/f8＜1，有利于控制第八透镜8的弯曲程度，用于校正像差，进一步降低鬼影的产生比率。In some embodiments of the present disclosure, the radius of curvature of the object side surface of the eighth lens 8 at the optical axis is R13, and the focal length of the eighth lens 8 is f8, where R13 and f8 satisfy: 0<R13/f8<1. Therefore, by setting 0<R13/f8<1, it is advantageous to control the degree of curvature of the eighth lens 8 for correcting aberrations and further reducing the generation rate of ghost images.
在本公开的一些实施例中，第五透镜5的像侧面于光轴处的曲率半径为R5，第六透镜6的物侧面于光轴处的曲率半径为R6，其中，R5、R6满足：-7＜(R5+R6)/(R5-R6)＜-3。具体地，例如，当(R5+R6)/(R5-R6)≤-7时，容易减小周边视角的主光线入射像面的角度；当(R5+R6)/(R5-R6)≥-3时，容易抑制像散的产生。由此，通过使-7＜(R5+R6)/(R5-R6)＜-3，使光学成像***100同时具有大视角和较高的清晰度， 保证成像质量。In some embodiments of the present disclosure, the radius of curvature of the image side surface of the fifth lens 5 at the optical axis is R5, and the radius of curvature of the object side surface of the sixth lens 6 at the optical axis is R6, where R5 and R6 satisfy: -7<(R5+R6)/(R5-R6)<-3. Specifically, for example, when (R5+R6)/(R5-R6)≤-7, it is easy to reduce the angle at which the chief ray of the peripheral viewing angle enters the image plane; when (R5+R6)/(R5-R6)≥- At 3, it is easy to suppress astigmatism. Therefore, by setting -7<(R5+R6)/(R5-R6)<-3, the optical imaging system 100 has a large viewing angle and a high definition at the same time, and the imaging quality is ensured.
在本公开的进一步实施例中，如图1、图3、图5、图7和图9所示，光学透镜组还包括光阑9，光阑9设在第一透镜1与第八透镜8之间。由此，通过设置光阑9，可以消除杂散光对像的影响，从而提升影像的品质。而且，光阑9有助于合理控制光学成像***100的视场角，使***成像更清晰。In a further embodiment of the present disclosure, as shown in FIG. 1, FIG. 3, FIG. 5, FIG. 7 and FIG. 9, the optical lens group further includes a diaphragm 9. The diaphragm 9 is provided in the first lens 1 and the eighth lens 8. between. Thus, by providing the diaphragm 9, the influence of stray light on the image can be eliminated, thereby improving the quality of the image. Moreover, the diaphragm 9 helps to reasonably control the angle of view of the optical imaging system 100, so that the system imaging is clearer.
可选地，第一透镜1、第二透镜2、第三透镜3、第四透镜4、第五透镜5、第六透镜6、第七透镜7和第八透镜8的材质可以为塑料或玻璃等。当第一透镜1、第二透镜2、第三透镜3、第四透镜4、第五透镜5、第六透镜6、第七透镜7和第八透镜8的材质为塑料时，可以减少光学成像***100的重量并降低生产成本；当第一透镜1、第二透镜2、第三透镜3、第四透镜4、第五透镜5、第六透镜6、第七透镜7和第八透镜8的材质为玻璃时，使光学成像***100具备优良的光学性能以及较高的耐温特性。当然，第一透镜1、第二透镜2、第三透镜3、第四透镜4、第五透镜5、第六透镜6、第七透镜7和第八透镜8的材质也可以为玻璃和塑料的任意组合，并不一定均为玻璃或均为塑料。Optionally, the material of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 may be plastic or glass Wait. When the material of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 is plastic, the optical imaging can be reduced The weight of the system 100 and reduce the production cost; when the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 When the material is glass, the optical imaging system 100 has excellent optical performance and high temperature resistance. Of course, the materials of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 can also be glass and plastic. Any combination, not necessarily all glass or all plastic.
下面参考图1-图10描述根据本公开多个实施例的光学成像***100。The optical imaging system 100 according to various embodiments of the present disclosure will be described below with reference to FIGS. 1 to 10.
实施例一，Example one,
在本实施例中，如图1所示，光学成像***100从物侧到像侧依次包括第一透镜1、第二透镜2、第三透镜3、光阑9、第四透镜4、第五透镜5、第六透镜6、第七透镜7和第八透镜8，光学成像***100的球差、像散和畸变曲线图参照图2。In this embodiment, as shown in FIG. 1, the optical imaging system 100 includes a first lens 1, a second lens 2, a third lens 3, an aperture 9, a fourth lens 4, and a fifth lens in order from the object side to the image side. Refer to FIG. 2 for the spherical aberration, astigmatism and distortion curves of the lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8, and the optical imaging system 100.
其中，第一透镜1至第八透镜8的物侧面和像侧面均不具有反曲点，第一透镜1至第八透镜8的材质均为玻璃，第二透镜2和第三透镜3相互胶合，第四透镜4和第五透镜5相互胶合。第一透镜1具有正曲折力，第一透镜1的物侧面为凸面，第一透镜1的像侧面为凹面，第一透镜1的物侧面和像侧面均为球面。第二透镜2具有正曲折力，第二透镜2的物侧面为凸面，第二透镜2的像侧面为凹面，第二透镜2的物侧面和像侧面均为球面。第三透镜3具有负曲折力，第三透镜3的物侧面为凸面，第三透镜3的像侧面为凹面，第三透镜3的物侧面和像侧面均为球面。第四透镜4具有负曲折力，第四透镜4的物侧面和像侧面均为凹面，且第四透镜4的物侧面和像侧面均为球面。第五透镜5具有正曲折力，第五透镜5的物侧面和像侧面均为凸面，且第五透镜5的物侧面和像侧面均为球面。第六透镜6具有正曲折力，第六透镜6的物侧面和像侧面均为凸面，第六透镜6的物侧面为非球面，第六透镜6的像侧面为球面。第七透镜7具有正曲折力，第七透镜7的物侧面为凸面，第七透镜7的像侧面为平面，第七透镜7的物侧面和像侧面均为球面。第八透镜8具有负曲折力，第八透镜8的物侧面为凹面，第八透镜8的像侧面为凸面，第八透镜8的物侧面和像侧面均为球面。Among them, the first lens 1 to the eighth lens 8 have no inflection point on the object side and the image side, the first lens 1 to the eighth lens 8 are made of glass, and the second lens 2 and the third lens 3 are cemented with each other. , The fourth lens 4 and the fifth lens 5 are cemented with each other. The first lens 1 has a positive refractive power, the object side surface of the first lens 1 is a convex surface, the image side surface of the first lens 1 is a concave surface, and both the object side surface and the image side surface of the first lens 1 are spherical surfaces. The second lens 2 has a positive refractive power, the object side surface of the second lens 2 is a convex surface, the image side surface of the second lens 2 is a concave surface, and both the object side surface and the image side surface of the second lens 2 are spherical surfaces. The third lens 3 has a negative refractive power, the object side surface of the third lens 3 is convex, the image side surface of the third lens 3 is concave, and both the object side surface and the image side surface of the third lens 3 are spherical surfaces. The fourth lens 4 has a negative refractive power, the object side and the image side of the fourth lens 4 are both concave, and the object side and the image side of the fourth lens 4 are both spherical. The fifth lens 5 has a positive bending force, the object side surface and the image side surface of the fifth lens 5 are both convex surfaces, and the object side surface and the image side surface of the fifth lens 5 are both spherical surfaces. The sixth lens 6 has a positive refractive power, the object side surface and the image side surface of the sixth lens 6 are both convex surfaces, the object side surface of the sixth lens 6 is an aspheric surface, and the image side surface of the sixth lens 6 is a spherical surface. The seventh lens 7 has a positive refractive power, the object side surface of the seventh lens 7 is convex, the image side surface of the seventh lens 7 is flat, and both the object side surface and the image side surface of the seventh lens 7 are spherical surfaces. The eighth lens 8 has a negative refractive power, the object side surface of the eighth lens 8 is concave, the image side surface of the eighth lens 8 is convex, and both the object side surface and the image side surface of the eighth lens 8 are spherical surfaces.
成像面设在第八透镜8的像侧，第八透镜8与成像面之间依次设有IR片和保护玻璃11，IR片的材质为玻璃且不影响焦距，感光元件设置在成像面上。IR片会对进入到镜头内的成像光线进行过滤，过滤掉红外光。The imaging surface is arranged on the image side of the eighth lens 8, an IR sheet and a protective glass 11 are arranged in sequence between the eighth lens 8 and the imaging surface. The IR sheet is made of glass and does not affect the focal length, and the photosensitive element is arranged on the imaging surface. The IR film will filter the imaging light entering the lens and filter out the infrared light.
实施例一详细的光学数据如表1所示，其非球面系数如表2所示，曲率半径、厚度和焦距的单位为毫米，光学成像***100的参考波长为546.074nm。其中，非球面面型公式为：
Figure PCTCN2020078004-appb-000001
z为非球面上相应点到与表面顶点相切的平面的距离，r为非球面上相应点到光轴的距离，c为非球面顶点的曲率，k为圆锥常数，Ai为非球面面型公式中与第i项高次项相对应的系数。 The detailed optical data of the first embodiment is shown in Table 1, and the aspheric coefficients are shown in Table 2. The units of the radius of curvature, thickness and focal length are millimeters, and the reference wavelength of the optical imaging system 100 is 546.074 nm. Among them, the aspheric surface type formula is:
Figure PCTCN2020078004-appb-000001
z is the distance from the corresponding point on the aspheric surface to the plane tangent to the apex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric apex, k is the conic constant, and Ai is the aspheric surface type The coefficient corresponding to the higher-order item of the i-th term in the formula.
表1Table 1
Figure PCTCN2020078004-appb-000002
Figure PCTCN2020078004-appb-000002
表2Table 2
Figure PCTCN2020078004-appb-000003
Figure PCTCN2020078004-appb-000003
Figure PCTCN2020078004-appb-000004
Figure PCTCN2020078004-appb-000004
在实施例一中，光学透镜组的有效焦距为EFL，第一透镜1的焦距为f1，第二透镜2和第三透镜3的合成焦距为f23，第四透镜4和第五透镜5合成焦距为f45，f1/EFL＝1.58；f23/EFL＝-3.87，f45/EFL＝-3.36；第六透镜6和第七透镜7之间的空气间隔距离为CT6,第六透镜6的焦距为f6,第七透镜7的焦距为f7，CT6/(1/f6+1/f7)＝1.47；第八透镜8的焦距为f8，f8/EFL＝-2.39；光学成像***100的入瞳直径为EPD，EFL/EPD＝1.65；第三透镜3的像侧面与第四透镜4的物侧面于光轴上的距离为∑CT56，光学成像***100的总长度为TTL，∑CT56/TTL＝0.18；光学成像***100的最大视场角为FOV，光学成像***100的最大视场角对应的像高为Imgh，(FOV×EFL)/Imgh＝56.363；第八透镜8的物侧面于光轴处的曲率半径为R13，R13/f8＝0.58；第五透镜5的像侧面于光轴处的曲率半径为R5，第六透镜6的物侧面于光轴处的曲率半径为R6，(R5+R6)/(R5-R6)＝-5.31。In the first embodiment, the effective focal length of the optical lens group is EFL, the focal length of the first lens 1 is f1, the composite focal length of the second lens 2 and the third lens 3 is f23, and the fourth lens 4 and the fifth lens 5 are composite focal lengths. F45, f1/EFL=1.58; f23/EFL=-3.87, f45/EFL=-3.36; the air separation distance between the sixth lens 6 and the seventh lens 7 is CT6, and the focal length of the sixth lens 6 is f6, The focal length of the seventh lens 7 is f7, CT6/(1/f6+1/f7)=1.47; the focal length of the eighth lens 8 is f8, f8/EFL=-2.39; the entrance pupil diameter of the optical imaging system 100 is EPD, EFL/EPD=1.65; the distance between the image side surface of the third lens 3 and the object side surface of the fourth lens 4 on the optical axis is ΣCT56, the total length of the optical imaging system 100 is TTL, ΣCT56/TTL=0.18; optical imaging The maximum angle of view of the system 100 is FOV, and the image height corresponding to the maximum angle of view of the optical imaging system 100 is Imgh, (FOV×EFL)/Imgh=56.363; the radius of curvature of the object side of the eighth lens 8 at the optical axis R13, R13/f8=0.58; the curvature radius of the image side surface of the fifth lens 5 at the optical axis is R5, and the curvature radius of the object side surface of the sixth lens 6 at the optical axis is R6, (R5+R6)/( R5-R6) = -5.31.
由此，通过上述设置，使光学成像***100在实现长焦距的同时，可以满足高清晰拍摄，且有利于实现小型化设计。Therefore, through the above-mentioned configuration, the optical imaging system 100 can satisfy high-definition shooting while achieving a long focal length, and is conducive to the realization of a miniaturized design.
实施例二，Example two,
如图3和图4所示，本实施例与实施例一的结构大致相同，其中相同的部件采用相同的附图标记，不同之处在于：第六透镜6的物侧面为球面，第八透镜8的像侧面为凹面，第八透镜8与成像面之间仅设有保护玻璃11，而没有IR片。As shown in Figures 3 and 4, the structure of this embodiment is approximately the same as that of the first embodiment, wherein the same components use the same reference numerals, and the difference is that: the object side surface of the sixth lens 6 is a spherical surface, and the eighth lens The image side surface of 8 is a concave surface, and only a protective glass 11 is provided between the eighth lens 8 and the imaging surface, and there is no IR sheet.
实施例二详细的光学数据如表3所示，曲率半径、厚度和焦距的单位为毫米，光学成像***100的参考波长为546.074nm。The detailed optical data of the second embodiment is shown in Table 3. The units of the radius of curvature, thickness and focal length are millimeters, and the reference wavelength of the optical imaging system 100 is 546.074 nm.
表3table 3
Figure PCTCN2020078004-appb-000005
Figure PCTCN2020078004-appb-000005
Figure PCTCN2020078004-appb-000006
Figure PCTCN2020078004-appb-000006
在实施例二中，f1/EFL＝1.47，f23/EFL＝-3.15，f45/EFL＝-2.10，CT6/(1/f6+1/f7)＝1.05，f8/EFL＝-1.19，EFL/EPD＝1.65，∑CT56/TTL＝0.19，(FOV×EFL)/Imgh＝56.683，R13/f8＝0.79，(R5+R6)/(R5-R6)＝-6.42。In the second embodiment, f1/EFL=1.47, f23/EFL=-3.15, f45/EFL=-2.10, CT6/(1/f6+1/f7)=1.05, f8/EFL=-1.19, EFL/EPD =1.65, ΣCT56/TTL=0.19, (FOV×EFL)/Imgh=56.683, R13/f8=0.79, (R5+R6)/(R5-R6)=-6.42.
本实施例的光学成像***100与实施例一的光学成像***100的其它结构类似，故不再在此详细描述。The other structures of the optical imaging system 100 of this embodiment are similar to those of the optical imaging system 100 of the first embodiment, and therefore will not be described in detail here.
实施例三，Example three,
如图5和图6所示，本实施例与实施例二的结构大致相同，其中相同的部件采用相同的附图标记，不同之处在于：第七透镜7的像侧面为凹面，第八透镜8的像侧面为凸面。As shown in Figures 5 and 6, the structure of this embodiment is roughly the same as that of the second embodiment. The same components are marked with the same reference numerals. The difference is that the image side surface of the seventh lens 7 is concave, and the eighth lens has a concave surface. The image side of 8 is convex.
实施例三详细的光学数据如表4所示，曲率半径、厚度和焦距的单位为毫米，光学成像***100的参考波长为546.074nm。The detailed optical data of the third embodiment is shown in Table 4. The units of the radius of curvature, thickness and focal length are millimeters, and the reference wavelength of the optical imaging system 100 is 546.074 nm.
表4Table 4
Figure PCTCN2020078004-appb-000007
Figure PCTCN2020078004-appb-000007
Figure PCTCN2020078004-appb-000008
Figure PCTCN2020078004-appb-000008
在实施例三中，f1/EFL＝1.71，f23/EFL＝-5.32，f45/EFL＝-2.73，CT6/(1/f6+1/f7)＝6.16，f8/EFL＝-1.35，EFL/EPD＝1.65，∑CT56/TTL＝0.20，(FOV×EFL)/Imgh＝56.512，R13/f8＝0.63，(R5+R6)/(R5-R6)＝-5.49。In the third embodiment, f1/EFL=1.71, f23/EFL=-5.32, f45/EFL=-2.73, CT6/(1/f6+1/f7)=6.16, f8/EFL=-1.35, EFL/EPD =1.65, ΣCT56/TTL=0.20, (FOV×EFL)/Imgh=56.512, R13/f8=0.63, (R5+R6)/(R5-R6)=-5.49.
本实施例的光学成像***100与实施例二的光学成像***100的其它结构类似，故不再在此详细描述。The other structure of the optical imaging system 100 of this embodiment is similar to that of the optical imaging system 100 of the second embodiment, so it will not be described in detail here.
实施例四，Example four,
如图7和图8所示，本实施例与实施例三的结构大致相同，其中相同的部件采用相同的附图标记，不同之处在于：第一透镜1至第七透镜7的物侧面和像侧面以及第八透镜8的物侧面的曲率半径与实施例三不同。As shown in Figures 7 and 8, the structure of this embodiment is roughly the same as that of the third embodiment, wherein the same components use the same reference numerals, and the difference is: the object side of the first lens 1 to the seventh lens 7 and The radius of curvature of the image side surface and the object side surface of the eighth lens 8 is different from that of the third embodiment.
实施例四详细的光学数据如表5所示，曲率半径、厚度和焦距的单位为毫米，光学成像***100的参考波长为546.074nm。The detailed optical data of the fourth embodiment is shown in Table 5. The units of the radius of curvature, thickness and focal length are millimeters, and the reference wavelength of the optical imaging system 100 is 546.074 nm.
表5table 5
Figure PCTCN2020078004-appb-000009
Figure PCTCN2020078004-appb-000009
Figure PCTCN2020078004-appb-000010
Figure PCTCN2020078004-appb-000010
实施例五，Example five,
如图9和图10所示，本实施例与实施例四的结构大致相同，其中相同的部件采用相同的附图标记，不同之处在于：第八透镜8的像侧面为凹面。As shown in Figs. 9 and 10, the structure of this embodiment is approximately the same as that of the fourth embodiment, wherein the same components are given the same reference numerals, and the difference is that the image side surface of the eighth lens 8 is concave.
实施例五详细的光学数据如表6所示，曲率半径、厚度和焦距的单位为毫米，光学成像***100的参考波长为546.074nm。The detailed optical data of the fifth embodiment is shown in Table 6. The units of the radius of curvature, thickness and focal length are millimeters, and the reference wavelength of the optical imaging system 100 is 546.074 nm.
表6Table 6
Figure PCTCN2020078004-appb-000011
Figure PCTCN2020078004-appb-000011
Figure PCTCN2020078004-appb-000012
Figure PCTCN2020078004-appb-000012
在实施例五中，f1/EFL＝1.76，f23/EFL＝-5.3，f45/EFL＝-2.55，CT6/(1/f6+1/f7)＝9.8，f8/EFL＝-1.03，EFL/EPD＝1.65，∑CT56/TTL＝0.17，(FOV×EFL)/Imgh＝56.614，R13/f8＝0.93，(R5+R6)/(R5-R6)＝-4.73。In the fifth embodiment, f1/EFL=1.76, f23/EFL=-5.3, f45/EFL=-2.55, CT6/(1/f6+1/f7)=9.8, f8/EFL=-1.03, EFL/EPD =1.65, ΣCT56/TTL=0.17, (FOV×EFL)/Imgh=56.614, R13/f8=0.93, (R5+R6)/(R5-R6)=-4.73.
本实施例的光学成像***100与实施例四的光学成像***100的其它结构类似，故不再在此详细描述。The other structure of the optical imaging system 100 of this embodiment is similar to that of the optical imaging system 100 of the fourth embodiment, so it will not be described in detail here.
根据本公开第二方面实施例的取像装置(图未示出)，包括光学成像***100和感光元件。具体地，光学成像***100为根据本公开上述第一方面实施例的光学成像***100，感光元件设在光学成像***100的像侧。An image capturing device (not shown in the figure) according to an embodiment of the second aspect of the present disclosure includes an optical imaging system 100 and a photosensitive element. Specifically, the optical imaging system 100 is the optical imaging system 100 according to the embodiment of the first aspect of the present disclosure, and the photosensitive element is provided on the image side of the optical imaging system 100.
根据本公开实施例的取像装置，通过采用上述光学成像***100，可以同时满足长焦距和高像素，成像质量较高，提升了取像装置整体的性能。According to the imaging device of the embodiment of the present disclosure, by adopting the above-mentioned optical imaging system 100, long focal length and high pixels can be satisfied at the same time, the imaging quality is high, and the overall performance of the imaging device is improved.
根据本公开第三方面实施例的电子装置(图未示出)，包括壳体(图未示出)和取像装置。壳体上形成有通孔，取像装置为根据本公开上述第二方面实施例的取像装置，取像装置安装在通孔处。An electronic device (not shown in the figure) according to an embodiment of the third aspect of the present disclosure includes a housing (not shown in the figure) and an image capturing device. A through hole is formed on the housing, and the image capturing device is the image capturing device according to the embodiment of the second aspect of the present disclosure, and the image capturing device is installed at the through hole.
根据本公开实施例的电子装置，通过采用上述取像装置，使电子装置兼具长焦距与高像素的优势，充分满足用户需求。According to the electronic device of the embodiment of the present disclosure, by adopting the above-mentioned image capturing device, the electronic device has the advantages of a long focal length and high pixels, and fully meets the needs of users.
根据本公开实施例的电子装置的其他构成以及操作对于本领域普通技术人员而言都是已知的，这里不再详细描述。Other configurations and operations of the electronic device according to the embodiments of the present disclosure are known to those of ordinary skill in the art, and will not be described in detail here.
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示意性实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials or characteristics described by the examples or examples are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example.
尽管已经示出和描述了本公开的实施例，本领域的普通技术人员可以理解：在不脱离本公开的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本公开的范围由权利要求及其等同物限定。Although the embodiments of the present disclosure have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and modifications can be made to these embodiments without departing from the principle and purpose of the present disclosure. The scope of the present disclosure is defined by the claims and their equivalents.

Claims (17)

  1. 一种光学成像***，其特征在于，包括：An optical imaging system, characterized in that it comprises:
    光学透镜组，所述光学透镜组包括沿轴向依次设置的第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜和第八透镜；An optical lens group, the optical lens group including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially arranged along the axial direction;
    所述第一透镜、所述第二透镜、所述第五透镜、所述第六透镜和所述第七透镜均具有正曲折力；The first lens, the second lens, the fifth lens, the sixth lens, and the seventh lens all have positive refractive power;
    所述第三透镜、所述第四透镜和所述第八透镜均具有负曲折力。The third lens, the fourth lens, and the eighth lens all have negative refractive power.
  2. 根据权利要求1所述的光学成像***，其特征在于，所述第二透镜的物侧面于光轴处为凸面，所述第二透镜的像侧面于光轴处为凹面，所述第三透镜的物侧面于光轴处为凸面，所述第三透镜的像侧面于光轴处为凹面，所述第二透镜与所述第三透镜相互胶合。The optical imaging system of claim 1, wherein the object side surface of the second lens is convex at the optical axis, the image side surface of the second lens is concave at the optical axis, and the third lens The object side surface of the third lens is convex on the optical axis, the image side surface of the third lens is concave on the optical axis, and the second lens and the third lens are cemented with each other.
  3. 根据权利要求1所述的光学成像***，其特征在于，所述第四透镜的物侧面和像侧面于光轴处均为凹面，所述第五透镜的物侧面和像侧面于光轴处均为凸面，所述第四透镜和所述第五透镜相互胶合。The optical imaging system according to claim 1, wherein the object side surface and the image side surface of the fourth lens are both concave at the optical axis, and the object side surface and the image side surface of the fifth lens are both concave at the optical axis. It is a convex surface, and the fourth lens and the fifth lens are cemented with each other.
  4. 根据权利要求1所述的光学成像***，其特征在于，所述第一透镜的物侧面于光轴处为凸面，所述第一透镜的像侧面于光轴处为凹面，所述第六透镜的物侧面和像侧面于光轴处均为凸面，所述第七透镜的物侧面于光轴处为凸面，所述第七透镜的像侧面于光轴处为平面或凹面，所述第八透镜的物侧面于光轴处为凹面，所述第八透镜的像侧面于光轴处为凸面或凹面。The optical imaging system of claim 1, wherein the object side surface of the first lens is convex at the optical axis, the image side surface of the first lens is concave at the optical axis, and the sixth lens The object side and the image side of the seventh lens are convex at the optical axis, the object side of the seventh lens is convex at the optical axis, the image side of the seventh lens is flat or concave at the optical axis, and the eighth The object side surface of the lens is concave at the optical axis, and the image side surface of the eighth lens is convex or concave at the optical axis.
  5. 根据权利要求1-4中任一项所述的光学成像***，其特征在于，所述第一透镜至所述第八透镜中的其中一个透镜的物侧面或像侧面设有滤光膜；或The optical imaging system according to any one of claims 1 to 4, wherein the object side or the image side of one of the first lens to the eighth lens is provided with a filter film; or
    所述第八透镜的像侧和成像面之间设有滤光片。A filter is arranged between the image side and the imaging surface of the eighth lens.
  6. 根据权利要求1所述的光学成像***，其特征在于，所述光学透镜组的有效焦距为EFL，所述第一透镜的焦距为f1，其中，所述EFL、f1满足：The optical imaging system of claim 1, wherein the effective focal length of the optical lens group is EFL, and the focal length of the first lens is f1, wherein the EFL and f1 satisfy:
    0＜f1/EFL＜2。0<f1/EFL<2.
  7. 根据权利要求1所述的光学成像***，其特征在于，所述光学透镜组的有效焦距为EFL，所述第二透镜和所述第三透镜的合成焦距为f23，其中，所述EFL、f23满足：The optical imaging system of claim 1, wherein the effective focal length of the optical lens group is EFL, and the combined focal length of the second lens and the third lens is f23, wherein the EFL and f23 satisfy:
    -6＜f23/EFL＜0。-6<f23/EFL<0.
  8. 根据权利要求1所述的光学成像***，其特征在于，所述光学透镜组的有效焦距为EFL，所述第四透镜和所述第五透镜合成焦距为f45，其中，所述EFL、f45满足：The optical imaging system of claim 1, wherein the effective focal length of the optical lens group is EFL, and the combined focal length of the fourth lens and the fifth lens is f45, wherein the EFL and f45 satisfy :
    -3.6＜f45/EFL＜0。-3.6<f45/EFL<0.
  9. 根据权利要求1所述的光学成像***，其特征在于，所述第六透镜和所述第七透镜于光轴上的空气间隔距离为CT6,所述第六透镜的焦距为f6,所述第七透镜的焦距为f7，其中，所述CT6、f6、f7满足：The optical imaging system according to claim 1, wherein the air separation distance between the sixth lens and the seventh lens on the optical axis is CT6, the focal length of the sixth lens is f6, and the focal length of the sixth lens is f6. The focal length of the seven lens is f7, where the CT6, f6, and f7 satisfy:
    1＜CT6/(1/f6+1/f7)＜25。1<CT6/(1/f6+1/f7)<25.
  10. 根据权利要求1所述的光学成像***，其特征在于，所述光学透镜组的有效焦距为EFL，所述第八透镜的焦距为f8，其中，所述EFL、f8满足：The optical imaging system of claim 1, wherein the effective focal length of the optical lens group is EFL, and the focal length of the eighth lens is f8, wherein the EFL and f8 satisfy:
    -3＜f8/EFL＜0。-3<f8/EFL<0.
  11. 根据权利要求1所述的光学成像***，其特征在于，所述光学透镜组的有效焦距为EFL，所述光学成像***的入瞳直径为EPD，其中，所述EFL、EPD满足：The optical imaging system according to claim 1, wherein the effective focal length of the optical lens group is EFL, and the entrance pupil diameter of the optical imaging system is EPD, wherein the EFL and EPD satisfy:
    EFL/EPD＜1.7。EFL/EPD<1.7.
  12. 根据权利要求1所述的光学成像***，其特征在于，所述第三透镜的像侧面与第四透镜的物侧面于光轴上的空间间隔距离为∑CT56，所述光学成像***的总长度为TTL，其中，所述∑CT56、TTL满足：The optical imaging system according to claim 1, wherein the spatial separation distance between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis is ΣCT56, and the total length of the optical imaging system Is TTL, where the ΣCT56 and TTL satisfy:
    0＜∑CT56/TTL＜0.3。0<∑CT56/TTL<0.3.
  13. 根据权利要求1所述的光学成像***，其特征在于，所述光学透镜组的有效焦距为EFL，所述光学成像***的最大视场角为FOV，所述光学成像***的最大视场角对应的像高为Imgh，其中，所述EFL、FOV、Imgh满足：The optical imaging system according to claim 1, wherein the effective focal length of the optical lens group is EFL, the maximum field angle of the optical imaging system is FOV, and the maximum field angle of the optical imaging system corresponds to The image height of is Imgh, where the EFL, FOV, and Imgh satisfy:
    45≤(FOV×EFL)/Imgh≤70。45≤(FOV×EFL)/Imgh≤70.
  14. 根据权利要求1所述的光学成像***，其特征在于，所述第八透镜的物侧面于光轴处的曲率半径为R13，所述第八透镜的焦距为f8，其中，所述R13、f8满足：The optical imaging system according to claim 1, wherein the radius of curvature of the object side surface of the eighth lens at the optical axis is R13, and the focal length of the eighth lens is f8, wherein the R13, f8 satisfy:
    0＜R13/f8＜1。0<R13/f8<1.
  15. 根据权利要求1所述的光学成像***，其特征在于，所述第五透镜的像侧面于光轴处的曲率半径为R5，所述第六透镜的物侧面于光轴处的曲率半径为R6，其中，所述R5、R6满足：The optical imaging system according to claim 1, wherein the radius of curvature of the image side surface of the fifth lens at the optical axis is R5, and the radius of curvature of the object side surface of the sixth lens at the optical axis is R6 , Wherein said R5 and R6 satisfy:
    -7＜(R5+R6)/(R5-R6)＜-3。-7<(R5+R6)/(R5-R6)<-3.
  16. 一种取像装置，其特征在于，包括：An image capturing device, characterized in that it comprises:
    光学成像***，所述光学成像***为根据权利要求1-15中任一项所述的光学成像***；An optical imaging system, the optical imaging system being the optical imaging system according to any one of claims 1-15;
    感光元件，所述感光元件设在所述光学成像***的像侧。The photosensitive element is arranged on the image side of the optical imaging system.
  17. 一种电子装置，其特征在于，包括：An electronic device, characterized in that it comprises:
    壳体，所述壳体上形成有通孔；A housing, a through hole is formed on the housing;
    取像装置，所述取像装置为根据权利要求16所述的取像装置，所述取像装置安装在所述通孔处。An image capturing device, which is the image capturing device according to claim 16, and the image capturing device is installed at the through hole.
PCT/CN2020/078004 2020-03-05 2020-03-05 Optical imaging system and image capturing device having same, and electronic device WO2021174489A1 (en)

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CN114578516A (en) * 2022-03-11 2022-06-03 深圳市视清科技有限公司 Optical lens with stable imaging quality

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US4057328A (en) * 1974-12-30 1977-11-08 Olympus Optical Co., Ltd. Enlarging lens system
US20060153553A1 (en) * 2005-01-11 2006-07-13 Akiyoshi Tochigi Optical system, finder optical system, relay type finder optical system, eyepiece optical system, and single-lens reflex camera
RU2368923C2 (en) * 2005-04-22 2009-09-27 Сергей Максимович Козловский Lens for night viewers
CN109387924A (en) * 2017-08-12 2019-02-26 南昌欧菲光电技术有限公司 Imaging optical system

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US4057328A (en) * 1974-12-30 1977-11-08 Olympus Optical Co., Ltd. Enlarging lens system
US20060153553A1 (en) * 2005-01-11 2006-07-13 Akiyoshi Tochigi Optical system, finder optical system, relay type finder optical system, eyepiece optical system, and single-lens reflex camera
RU2368923C2 (en) * 2005-04-22 2009-09-27 Сергей Максимович Козловский Lens for night viewers
CN109387924A (en) * 2017-08-12 2019-02-26 南昌欧菲光电技术有限公司 Imaging optical system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114578516A (en) * 2022-03-11 2022-06-03 深圳市视清科技有限公司 Optical lens with stable imaging quality
CN114578516B (en) * 2022-03-11 2024-04-02 深圳市视清科技有限公司 Optical lens with stable imaging quality

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