WO2021253229A1 - 光学系统、镜头模组及终端设备 - Google Patents

光学系统、镜头模组及终端设备 Download PDF

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Publication number
WO2021253229A1
WO2021253229A1 PCT/CN2020/096368 CN2020096368W WO2021253229A1 WO 2021253229 A1 WO2021253229 A1 WO 2021253229A1 CN 2020096368 W CN2020096368 W CN 2020096368W WO 2021253229 A1 WO2021253229 A1 WO 2021253229A1
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Prior art keywords
lens
optical system
optical axis
object side
circumference
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PCT/CN2020/096368
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English (en)
French (fr)
Inventor
杨健
李明
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欧菲光集团股份有限公司
南昌欧菲精密光学制品有限公司
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Priority to PCT/CN2020/096368 priority Critical patent/WO2021253229A1/zh
Publication of WO2021253229A1 publication Critical patent/WO2021253229A1/zh

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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

Definitions

  • This application belongs to the field of optical imaging technology, and in particular relates to an optical system, a lens module and a terminal device.
  • the current camera lens usually needs to have the feature of miniaturization. As the demand for long-range shooting increases, the camera lens needs to have a long focal length, but it is prone to problems such as insufficient sharpness and poor image quality, resulting in unsatisfactory long-range photography effects.
  • the embodiments of the present application provide an optical system, a lens module, and a terminal device.
  • the optical system increases the focal length of the system and improves the image quality while satisfying the miniature design.
  • the image quality is clear even in low light conditions. picture of.
  • an embodiment of the present application provides an optical system.
  • the optical system includes a plurality of lenses. (Refers to the side where light exits) the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens arranged in sequence, wherein the first lens It has positive refractive power, the third lens has negative refractive power, and the rest of the lenses have refractive power; the object side of the first lens is convex at the optical axis, and the image side of the third lens is at the optical axis It is a concave surface, and the image side surface of the fourth lens is a convex surface at the optical axis.
  • the refractive power is the refractive power, which characterizes the ability of the optical system to deflect light.
  • the second lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens have refractive power, which means that the second lens ,
  • the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens can have positive refractive power or negative refractive power.
  • the light beam diverges.
  • the refractive power of the eight lenses in a preferred embodiment may be that the first lens has positive refractive power, the second lens has negative refractive power, the third lens has negative refractive power, and the fourth lens has positive refractive power,
  • the fifth lens has negative refractive power
  • the sixth lens has negative refractive power
  • the seventh lens has negative refractive power
  • the eighth lens L8 has positive refractive power.
  • the refractive powers of the eight lenses can also be other preferred combinations.
  • the lens does not have refractive power, that is, when the optical power is zero, it is plane refraction. At this time, after being refracted, the beam parallel to the axis is still the beam parallel to the axis, and no refraction occurs.
  • the optical system satisfies the following conditional formula: TTL/f ⁇ 1.1, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and f is the focal length of the optical system.
  • This application rationally configures the refractive power of the first lens to the eighth lens in the optical system and the surface shape of the first lens, the third lens and the fourth lens and limits the TTL/f ⁇ 1.1, so as to satisfy the miniature design while making the optical
  • the system has the characteristics of long focal length, and has good imaging quality, so that the captured images have high quality, high resolution and high definition.
  • the object side and image side of all the lenses are aspherical, which is beneficial to correct the spherical aberration of the optical system and improve the imaging quality of the optical system.
  • the optical system satisfies the conditional formula: -1.8 ⁇ f1/f28 ⁇ -0.5, f1 is the focal length of the first lens, and f28 is the combined focal length of the second lens to the eighth lens .
  • the optical system satisfies the conditional formula: TTL/ct56>4, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and ct56 is the first lens. The distance from the object side of the five lens to the image side of the sixth lens on the optical axis.
  • the optical system satisfies the conditional formula: (L81-L82)/2*L83>0.7, a beam of light is incident on the farthest point from the optical axis of the imaging surface of the optical system, and the light There is a first intersection with the image side surface of the eighth lens, L81 is the maximum distance from the first intersection to the vertical projection point of the first intersection on the optical axis, and L82 is the first intersection to the first intersection.
  • L83 is the The maximum distance from the second point of intersection to the vertical projection point of the second point of intersection on the optical axis.
  • the optical system satisfies the conditional formula: TTL/Imgh ⁇ 2.5, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and Imgh is the optical axis.
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis
  • Imgh is the optical axis.
  • the image height corresponding to half of the system's maximum field of view.
  • limiting the TTL/Imgh to less than 2.5 can reduce the total length of the optical system and achieve the requirements of miniaturization of the optical system.
  • the optical system satisfies the conditional formula: FNO ⁇ 2.4, and FNO is the aperture number of the optical system.
  • FNO is the aperture number of the optical system.
  • the optical system satisfies the conditional formula: Imgh/tan(HFOV)>5mm, Imgh is the image height corresponding to half of the maximum angle of view of the optical system, and tan(HFOV) is the optical system The tangent of half of the maximum angle of view.
  • Imgh/tan (HFOV) the system can have the characteristics of a long focal length, increase the magnification of imaging, and be beneficial to long-range shooting.
  • the present application provides a lens module including a photosensitive element and the optical system according to any one of the foregoing embodiments, and the photosensitive element is located on the image side of the optical system.
  • this application provides a terminal device including the aforementioned lens module.
  • the optical system has The feature of long focal length, and good image quality, can shoot clear pictures even in low light conditions, so that the captured pictures have high quality, high resolution and high definition.
  • FIG. 1 is a schematic structural diagram of an optical system provided by the first embodiment of the present application.
  • Fig. 3 is a schematic structural diagram of an optical system provided by a second embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of an optical system provided by a third embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of an optical system provided by a fourth embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of an optical system provided by a fifth embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of an optical system provided by a sixth embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of an optical system provided by a seventh embodiment of the present application.
  • 15 is a schematic structural diagram of an optical system provided by an eighth embodiment of the present application.
  • FIG. 17 is a schematic structural diagram of an optical system provided by a ninth embodiment of the present application.
  • FIG. 19 is a schematic diagram of the optical system provided by the present application applied to a terminal device.
  • An optical system provided by the present application includes eight lenses, and the eight lenses are sequentially distributed from the object side to the image side, respectively, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens. , The seventh lens and the eighth lens.
  • the surface shape and refractive power of the eight lenses are as follows:
  • the first lens has positive refractive power
  • the third lens has negative refractive power
  • the rest of the lenses have refractive power
  • the object side of the first lens is convex at the optical axis
  • the image of the third lens The side surface is concave at the optical axis
  • the image side surface of the fourth lens is convex at the optical axis.
  • the optical system satisfies the following conditional formula: TTL/f ⁇ 1.1, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and f is the focal length of the optical system.
  • the optical system has a long The characteristics of focal length and good imaging quality make the pictures shot with high quality, high resolution and high definition.
  • the object side and image side of all the lenses are aspherical, which is beneficial to correct the spherical aberration of the optical system and improve the imaging quality of the optical system.
  • the optical system satisfies the conditional formula: -1.8 ⁇ f1/f28 ⁇ -0.5, f1 is the focal length of the first lens, and f28 is the combined focal length of the second lens to the eighth lens .
  • f1/f28 it is beneficial to the reasonable distribution of the optical power of the first lens to the eighth lens of the optical system, which can better correct the chromatic aberration of the system and improve the imaging performance of the system.
  • the optical system satisfies the conditional formula: TTL/ct56>4, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and ct56 is the first lens. The distance from the object side of the five lens to the image side of the sixth lens on the optical axis.
  • the optical system satisfies the conditional formula: (L81-L82)/2*L83>0.7, a beam of light is incident on the farthest point from the optical axis of the imaging surface of the optical system, and the light There is a first intersection with the image side surface of the eighth lens, L81 is the maximum distance from the first intersection to the vertical projection point of the first intersection on the optical axis, and L82 is the first intersection to the first intersection.
  • L83 is the The maximum distance from the second point of intersection to the vertical projection point of the second point of intersection on the optical axis.
  • the optical system satisfies the conditional formula: TTL/Imgh ⁇ 2.5, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and Imgh is the optical axis.
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis
  • Imgh is the optical axis.
  • the image height corresponding to half of the system's maximum field of view.
  • limiting the TTL/Imgh to less than 2.5 can reduce the total length of the optical system and achieve the requirements of miniaturization of the optical system.
  • the optical system satisfies the conditional formula: FNO ⁇ 2.4, and FNO is the aperture number of the optical system.
  • FNO is the aperture number of the optical system.
  • the optical system satisfies the conditional formula: Imgh/tan(HFOV)>5mm, Imgh is the image height corresponding to half of the maximum angle of view of the optical system, and tan(HFOV) is the optical system The tangent of half of the maximum angle of view.
  • Imgh/tan (HFOV) the system can have the characteristics of a long focal length, increase the magnification of imaging, and be beneficial to long-range shooting.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the sixth lens L6 away from the fifth lens L5 is the image side 13.
  • the stop STO from the object side 12 to the image side 13, there are the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the Six lens L6, seventh lens L7, eighth lens L8, infrared filter element IRCF.
  • the first lens L1 has positive refractive power and is made of plastic. Its object side surface S1 is convex at the optical axis, its object side S1 is concave at the circumference, and its image side S2 is convex at the optical axis and at the circumference. They are all aspherical.
  • the second lens L2 has negative refractive power and is made of plastic. Its object side surface S3 is convex at the optical axis and at the circumference, and its image side surface S4 is concave at the optical axis and at the circumference, and both are aspherical.
  • the third lens L3 has negative refractive power and is made of plastic material. Its object side surface S5 is convex at the optical axis and at the circumference, and its image side surface S6 is concave at the optical axis and at the circumference, and both are aspherical.
  • the fourth lens L4 has positive refractive power and is made of plastic material. Its object side surface S7 is concave at the optical axis and at the circumference, and its image side surface S8 is convex at the optical axis and at the circumference, and both are aspherical.
  • the fifth lens L5 has negative refractive power and is made of plastic. Its object side surface S9 is convex at the optical axis, its object side S9 is concave at the circumference, and its image side S10 is concave at the optical axis and at the circumference. They are all aspherical.
  • the sixth lens L6 has negative refractive power and is made of plastic. Its object side surface S11 is concave at the optical axis, its object side S11 is convex at the circumference, and its image side S12 is concave at the optical axis and at the circumference. They are all aspherical.
  • the seventh lens L7 has negative refractive power and is made of plastic. Its object side surface S13 is convex at the optical axis, its object side surface S13 is concave at the circumference, and its image side surface S14 is concave at the optical axis and at the circumference. They are all aspherical.
  • the eighth lens L8 has positive refractive power and is made of plastic. Its object side surface S15 is convex at the optical axis, its object side surface S15 is concave at the circumference, its image side surface S16 is concave at the optical axis, and its image side surface S16 It is convex on the circumference and all aspherical.
  • the stop STO can be located between the object plane of the optical system and the eighth lens.
  • the stop STO in this embodiment is arranged on the object side of the first lens L1 and can be used to control the amount of light entering.
  • the infrared filter element IRCF is arranged behind the eighth lens L8, including the object side S17 and the image side S18.
  • the infrared filter element IRCF is used to filter infrared light so that the light entering the imaging surface is visible light, and the wavelength of the visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging surface S19 is the surface on which the image formed by the light of the subject passes through the optical system.
  • Table 1a shows the characteristic table of the optical system of this embodiment, where the radius of curvature in this embodiment is the radius of curvature of each lens at the optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field angle of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis.
  • the object side surface and the image side surface of any one of the first lens L1 to the eighth lens L8 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:
  • 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
  • Ai is the aspheric surface formula The coefficient corresponding to the higher-order item of the i-th term.
  • Table 1b shows the high order of the aspheric mirrors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 that can be used in the first embodiment
  • FIG. 2 shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the first embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the lenses of the optical system
  • the astigmatism curve represents the meridional curvature of the image plane and the sagittal curvature of the image plane, where S represents the sagittal direction and T represents the meridional direction
  • the distortion curve represents the magnitude of distortion corresponding to different angles of view. According to FIG. 2, it can be seen that the optical system provided in the first embodiment can achieve good imaging quality.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the sixth lens L6 away from the fifth lens L5 is the image side 13.
  • the stop STO from the object side 12 to the image side 13, there are the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the Six lens L6, seventh lens L7, eighth lens L8, infrared filter element IRCF.
  • the first lens L1 has positive refractive power and is made of plastic. Its object side surface S1 is convex at the optical axis, its object side S1 is concave at the circumference, and its image side S2 is convex at the optical axis and at the circumference. They are all aspherical.
  • the second lens L2 has positive refractive power and is made of plastic material. Its object side surface S3 is convex at the optical axis and at the circumference, and its image side surface S4 is concave at the optical axis and at the circumference, and both are aspherical.
  • the third lens L3 has a negative refractive power and is made of plastic. Its object side surface S5 is convex at the optical axis, its object side surface S5 is concave at the circumference, and its image side surface S6 is concave at the optical axis and at the circumference. They are all aspherical.
  • the fourth lens L4 has positive refractive power and is made of plastic material. Its object side surface S7 is concave at the optical axis and at the circumference, and its image side surface S8 is convex at the optical axis and at the circumference, and both are aspherical.
  • the fifth lens L5 has negative refractive power and is made of plastic. Its object side surface S9 is convex at the optical axis, its object side surface S9 is concave at the circumference, and its image side surface S10 is concave at the optical axis and at the circumference. They are all aspherical.
  • the sixth lens L6 has a negative refractive power and is made of plastic. Its object side surface S11 is concave at the optical axis, its object side surface S11 is convex at the circumference, its image side surface S12 is concave at the optical axis, and its image side surface S12 It is convex on the circumference and all aspherical.
  • the seventh lens L7 has negative refractive power and is made of plastic. Its object side surface S13 is concave at the optical axis and at the circumference, its image side surface S14 is convex at the optical axis, and its image side surface S14 is concave at the circumference. All are aspherical.
  • the eighth lens L8 has negative refractive power and is made of plastic. Its object side surface S15 is concave at the optical axis and at the circumference, and its image side surface S16 is convex at the optical axis and at the circumference, and both are aspherical.
  • the stop STO can be located between the object plane of the optical system and the eighth lens.
  • the stop STO in this embodiment is arranged on the object side of the first lens L1 and can be used to control the amount of light entering.
  • the infrared filter element IRCF is arranged behind the eighth lens L8, including the object side S17 and the image side S18.
  • the infrared filter element IRCF is used to filter infrared light so that the light entering the imaging surface is visible light, and the wavelength of the visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging surface S19 is the surface on which the image formed by the light of the subject passes through the optical system.
  • Table 2a shows the characteristic table of the optical system of this embodiment, where the radius of curvature in this embodiment is the radius of curvature of each lens at the optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field angle of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis.
  • Table 2b shows the high order of the aspheric mirrors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 that can be used in the second embodiment
  • FIG. 4 shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the second embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focal point of light rays of different wavelengths after passing through the lenses of the optical system
  • the astigmatism curve represents the meridional field curvature and the sagittal field curvature, where S represents the sagittal direction and T represents the meridional direction
  • the distortion curve represents the magnitude of distortion corresponding to different angles of view. According to FIG. 4, it can be seen that the optical system provided in the second embodiment can achieve good imaging quality.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the sixth lens L6 away from the fifth lens L5 is the image side 13.
  • the stop STO from the object side 12 to the image side 13, there are the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the Six lens L6, seventh lens L7, eighth lens L8, infrared filter element IRCF.
  • the first lens L1 has a positive refractive power and is made of plastic. Its object side surface S1 is convex at the optical axis, its object side S1 is concave at the circumference, and its image side S2 is convex at the optical axis and at the circumference, They are all aspherical.
  • the second lens L2 has a negative refractive power and is made of plastic material. Its object side surface S3 is convex at the optical axis and at the circumference, and its image side surface S4 is concave at the optical axis and at the circumference, and both are aspherical.
  • the third lens L3 has negative refractive power and is made of plastic. Its object side surface S5 is convex at the optical axis, its object side surface S5 is concave at the circumference, and its image side surface S6 is concave at the optical axis and at the circumference. They are all aspherical.
  • the fourth lens L4 has positive refractive power and is made of plastic material. Its object side surface S7 is concave at the optical axis and at the circumference, and its image side surface S8 is convex at the optical axis and at the circumference, and both are aspherical.
  • the fifth lens L5 has negative refractive power and is made of plastic material. Its object side surface S9 is convex at the optical axis and at the circumference, and its image side surface S10 is concave at the optical axis and at the circumference, and both are aspherical.
  • the sixth lens L6 has a negative refractive power and is made of plastic. Its object side surface S11 is concave at the optical axis, its object side surface S11 is convex at the circumference, its image side surface S12 is concave at the optical axis, and its image side surface S12 It is convex on the circumference and all aspherical.
  • the seventh lens L7 has negative refractive power and is made of plastic material. Its object side surface S13 is concave at the optical axis and at the circumference, and its image side surface S14 is convex at the optical axis and at the circumference, and both are aspherical.
  • the eighth lens L8 has positive refractive power and is made of plastic. Its object side surface S15 is convex at the optical axis, its object side surface S15 is concave at the circumference, and its image side surface S16 is concave at the optical axis and at the circumference. They are all aspherical.
  • the stop STO can be located between the object plane of the optical system and the eighth lens.
  • the stop STO in this embodiment is arranged on the object side of the first lens L1 and can be used to control the amount of light entering.
  • the infrared filter element IRCF is arranged behind the eighth lens L8, including the object side S17 and the image side S18.
  • the infrared filter element IRCF is used to filter infrared light so that the light entering the imaging surface is visible light, and the wavelength of the visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging surface S19 is the surface on which the image formed by the light of the subject passes through the optical system.
  • Table 3a shows the characteristic table of the optical system of this embodiment, where the radius of curvature in this embodiment is the radius of curvature of each lens at the optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field angle of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis.
  • Table 3b shows the high order of the aspheric mirrors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 that can be used in the third embodiment
  • FIG. 6 shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the third embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the lenses of the optical system
  • the astigmatism curve represents the meridional curvature of the image plane and the sagittal curvature of the image plane, where S represents the sagittal direction and T represents the meridional direction
  • the distortion curve represents the magnitude of distortion corresponding to different angles of view. It can be seen from FIG. 6 that the optical system provided in the third embodiment can achieve good imaging quality.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the sixth lens L6 away from the fifth lens L5 is the image side 13.
  • the stop STO from the object side 12 to the image side 13, there are the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the Six lens L6, seventh lens L7, eighth lens L8, infrared filter element IRCF.
  • the first lens L1 has positive refractive power and is made of plastic. Its object side surface S1 is convex at the optical axis, its object side S1 is concave at the circumference, and its image side S2 is convex at the optical axis and at the circumference. They are all aspherical.
  • the second lens L2 has negative refractive power and is made of plastic. Its object side surface S3 is convex at the optical axis and at the circumference, its image side surface S4 is concave at the optical axis, and its image side surface S4 is convex at the circumference. They are all aspherical.
  • the third lens L3 has a negative refractive power and is made of plastic. Its object side surface S5 is convex at the optical axis, its object side surface S5 is concave at the circumference, and its image side surface S6 is concave at the optical axis and at the circumference. They are all aspherical.
  • the fourth lens L4 has positive refractive power and is made of plastic material. Its object side surface S7 is concave at the optical axis and at the circumference, and its image side surface S8 is convex at the optical axis and at the circumference, and both are aspherical.
  • the fifth lens L5 has negative refractive power and is made of plastic. Its object side surface S9 is convex at the optical axis, its object side surface S9 is concave at the circumference, and its image side surface S10 is concave at the optical axis and at the circumference. They are all aspherical.
  • the sixth lens L6 has a negative refractive power and is made of plastic. Its object side surface S11 is concave at the optical axis, its object side surface S11 is convex at the circumference, its image side surface S12 is concave at the optical axis, and its image side surface S12 It is convex on the circumference and all aspherical.
  • the seventh lens L7 has negative refractive power and is made of plastic. Its object side surface S13 is concave at the optical axis, its object side surface S13 is convex at the circumference, its image side surface S14 is convex at the optical axis, and its image side surface S14 The circumference is concave and all aspherical.
  • the eighth lens L8 has positive refractive power and is made of plastic. Its object side surface S15 is convex at the optical axis, its object side surface S15 is concave at the circumference, and its image side surface S16 is concave at the optical axis and at the circumference. They are all aspherical.
  • the stop STO can be located between the object plane of the optical system and the eighth lens.
  • the stop STO in this embodiment is arranged on the object side of the first lens L1 and can be used to control the amount of light entering.
  • the infrared filter element IRCF is arranged behind the eighth lens L8, including the object side S17 and the image side S18.
  • the infrared filter element IRCF is used to filter infrared light so that the light entering the imaging surface is visible light, and the wavelength of the visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging surface S19 is the surface on which the image formed by the light of the subject passes through the optical system.
  • Table 4a shows the characteristic table of the optical system of this embodiment, where the radius of curvature in this embodiment is the radius of curvature of each lens at the optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field angle of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis.
  • Table 4b shows the high order of the aspheric mirrors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 that can be used in the fourth embodiment
  • FIG. 8 shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the fourth embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the lenses of the optical system
  • the astigmatism curve represents the meridional curvature of the image plane and the sagittal curvature of the image plane, where S represents the sagittal direction and T represents the meridional direction
  • the distortion curve represents the magnitude of distortion corresponding to different angles of view. It can be seen from FIG. 8 that the optical system provided in the fourth embodiment can achieve good imaging quality.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the sixth lens L6 away from the fifth lens L5 is the image side 13.
  • the stop STO from the object side 12 to the image side 13, there are the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the Six lens L6, seventh lens L7, eighth lens L8, infrared filter element IRCF.
  • the first lens L1 has positive refractive power and is made of plastic. Its object side surface S1 is convex at the optical axis, its object side surface S1 is concave at the circumference, its image side surface S2 is concave at the optical axis, and its image side surface S2 It is convex on the circumference and all aspherical.
  • the second lens L2 has negative refractive power and is made of plastic. Its object side surface S3 is concave at the optical axis, its object side S3 is convex at the circumference, and its image side S4 is concave at the optical axis and at the circumference. They are all aspherical.
  • the third lens L3 has a negative refractive power and is made of plastic. Its object side surface S5 is convex at the optical axis, its object side surface S5 is concave at the circumference, and its image side surface S6 is concave at the optical axis and at the circumference. They are all aspherical.
  • the fourth lens L4 has positive refractive power and is made of plastic material. Its object side surface S7 is concave at the optical axis and at the circumference, and its image side surface S8 is convex at the optical axis and at the circumference, and both are aspherical.
  • the fifth lens L5 has a negative refractive power and is made of plastic material. Its object side surface S9 is concave at the optical axis and at the circumference, and its image side surface S10 is concave at the optical axis and at the circumference, and both are aspherical.
  • the sixth lens L6 has a negative refractive power and is made of plastic. Its object side surface S11 is concave at the optical axis, its object side surface S11 is convex at the circumference, its image side surface S12 is concave at the optical axis, and its image side surface S12 It is convex on the circumference and all aspherical.
  • the seventh lens L7 has negative refractive power and is made of plastic. Its object side surface S13 is concave at the optical axis, its object side surface S13 is convex at the circumference, its image side surface S14 is concave at the optical axis, and its image side surface S14 It is convex on the circumference and all aspherical.
  • the eighth lens L8 has positive refractive power and is made of plastic. Its object side surface S15 is convex at the optical axis, its object side surface S15 is concave at the circumference, and its image side surface S16 is concave at the optical axis and at the circumference. They are all aspherical.
  • the stop STO can be located between the object plane of the optical system and the eighth lens.
  • the stop STO in this embodiment is arranged on the object side of the first lens L1 and can be used to control the amount of light entering.
  • the infrared filter element IRCF is arranged behind the eighth lens L8, including the object side S17 and the image side S18.
  • the infrared filter element IRCF is used to filter infrared light so that the light entering the imaging surface is visible light, and the wavelength of the visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging surface S19 is the surface on which the image formed by the light of the subject passes through the optical system.
  • Table 5a shows the characteristic table of the optical system of this embodiment, where the radius of curvature in this embodiment is the radius of curvature of each lens at the optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field angle of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis.
  • Table 5b shows the high order of the aspheric mirrors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 that can be used in the fifth embodiment
  • FIG. 10 shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the fifth embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the lenses of the optical system
  • the astigmatism curve represents the meridional curvature of the image plane and the sagittal curvature of the image plane, where S represents the sagittal direction and T represents the meridional direction
  • the distortion curve represents the magnitude of distortion corresponding to different angles of view. It can be seen from FIG. 10 that the optical system provided in the fifth embodiment can achieve good imaging quality.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the sixth lens L6 away from the fifth lens L5 is the image side 13.
  • the stop STO from the object side 12 to the image side 13, there are the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the Six lens L6, seventh lens L7, eighth lens L8, infrared filter element IRCF.
  • the first lens L1 has positive refractive power and is made of plastic. Its object side surface S1 is convex at the optical axis, its object side S1 is concave at the circumference, and its image side S2 is convex at the optical axis and at the circumference. They are all aspherical.
  • the second lens L2 has positive refractive power and is made of plastic material. Its object side surface S3 is convex at the optical axis and at the circumference, and its image side surface S4 is concave at the optical axis and at the circumference, and both are aspherical.
  • the third lens L3 has a negative refractive power and is made of plastic. Its object side surface S5 is convex at the optical axis, its object side surface S5 is concave at the circumference, and its image side surface S6 is concave at the optical axis and at the circumference. They are all aspherical.
  • the fourth lens L4 has positive refractive power and is made of plastic. Its object side surface S7 is convex at the optical axis, its object side surface S7 is concave at the circumference, and its image side surface S8 is convex at the optical axis and at the circumference. And they are all aspherical.
  • the fifth lens L5 has negative refractive power and is made of plastic. Its object side surface S9 is convex at the optical axis, its object side surface S9 is concave at the circumference, and its image side surface S10 is concave at the optical axis and at the circumference. They are all aspherical.
  • the sixth lens L6 has positive refractive power and is made of plastic material. Its object side surface S11 is convex at the optical axis and at the circumference, its image side surface S12 is concave at the optical axis, and its image side surface S12 is convex at the circumference. They are all aspherical.
  • the seventh lens L7 has positive refractive power and is made of plastic. Its object side surface S13 is convex at the optical axis and at the circumference, its image side surface S14 is concave at the optical axis, and its image side surface S14 is convex at the circumference. They are all aspherical.
  • the eighth lens L8 has negative refractive power and is made of plastic. Its object side surface S15 is concave at the optical axis and at the circumference, its image side surface S16 is convex at the optical axis, and its image side surface S16 is concave at the circumference. They are all aspherical.
  • the stop STO can be located between the object plane of the optical system and the eighth lens.
  • the stop STO in this embodiment is arranged on the object side of the first lens L1 and can be used to control the amount of light entering.
  • the infrared filter element IRCF is arranged behind the eighth lens L8, including the object side S17 and the image side S18.
  • the infrared filter element IRCF is used to filter infrared light so that the light entering the imaging surface is visible light, and the wavelength of the visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging surface S19 is the surface on which the image formed by the light of the subject passes through the optical system.
  • Table 6a shows a characteristic table of the optical system of this embodiment, where the radius of curvature in this embodiment is the radius of curvature of each lens at the optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field angle of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis.
  • Table 6b shows the high order of the aspheric mirrors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 that can be used in the sixth embodiment
  • FIG. 12 shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the sixth embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focal point of light rays of different wavelengths after passing through the lenses of the optical system
  • the astigmatism curve represents the meridional field curvature and the sagittal field curvature, where S represents the sagittal direction and T represents the meridional direction
  • the distortion curve represents the magnitude of distortion corresponding to different angles of view. According to FIG. 12, it can be seen that the optical system provided in the sixth embodiment can achieve good imaging quality.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the sixth lens L6 away from the fifth lens L5 is the image side 13.
  • the stop STO from the object side 12 to the image side 13, there are the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the Six lens L6, seventh lens L7, eighth lens L8, infrared filter element IRCF.
  • the first lens L1 has a positive refractive power and is made of plastic. Its object side surface S1 is convex at the optical axis, its object side S1 is concave at the circumference, and its image side S2 is convex at the optical axis and at the circumference, They are all aspherical.
  • the second lens L2 has a negative refractive power and is made of plastic material. Its object side surface S3 is convex at the optical axis and at the circumference, and its image side surface S4 is concave at the optical axis and at the circumference, and both are aspherical.
  • the third lens L3 has a negative refractive power and is made of plastic. Its object side surface S5 is convex at the optical axis and at the circumference, and its image side surface S6 is concave at the optical axis and at the circumference, and both are aspherical.
  • the fourth lens L4 has a negative refractive power and is made of plastic. Its object side surface S7 is concave at the optical axis, its object side surface S7 is convex at the circumference, and its image side surface S8 is convex at the optical axis and at the circumference. And they are all aspherical.
  • the fifth lens L5 has positive refractive power and is made of plastic. Its object side surface S9 is convex at the optical axis, its object side surface S9 is concave at the circumference, and its image side surface S10 is concave at the optical axis and at the circumference. They are all aspherical.
  • the sixth lens L6 has a negative refractive power and is made of plastic. Its object side surface S11 is concave at the optical axis, its object side surface S11 is convex at the circumference, its image side surface S12 is concave at the optical axis, and its image side surface S12 It is convex on the circumference and all aspherical.
  • the seventh lens L7 has positive refractive power and is made of plastic material. Its object side surface S13 is convex at the optical axis, its object side surface S13 is concave at the circumference, and its image side surface S14 is concave at the optical axis and at the circumference. They are all aspherical.
  • the eighth lens L8 has negative refractive power and is made of plastic. Its object side surface S15 is convex at the optical axis, its object side surface S15 is concave at the circumference, its image side surface S16 is concave at the optical axis, and its image side surface S16 It is convex on the circumference and all aspherical.
  • the stop STO can be located between the object plane of the optical system and the eighth lens.
  • the stop STO in this embodiment is arranged on the object side of the first lens L1 and can be used to control the amount of light entering.
  • the infrared filter element IRCF is arranged behind the eighth lens L8, including the object side S17 and the image side S18.
  • the infrared filter element IRCF is used to filter infrared light so that the light entering the imaging surface is visible light, and the wavelength of the visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging surface S19 is the surface on which the image formed by the light of the subject passes through the optical system.
  • Table 7a shows a characteristic table of the optical system of this embodiment, where the radius of curvature in this embodiment is the radius of curvature of each lens at the optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field of view of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis.
  • Table 7b shows the high order of the aspheric mirrors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 that can be used in the seventh embodiment
  • FIG. 14 shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the seventh embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the lenses of the optical system
  • the astigmatism curve represents the meridional curvature of the image plane and the sagittal curvature of the image plane, where S represents the sagittal direction and T represents the meridional direction
  • the distortion curve represents the magnitude of distortion corresponding to different angles of view. It can be seen from FIG. 14 that the optical system provided in the seventh embodiment can achieve good imaging quality.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the sixth lens L6 away from the fifth lens L5 is the image side 13.
  • the stop STO from the object side 12 to the image side 13, there are the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the Six lens L6, seventh lens L7, eighth lens L8, infrared filter element IRCF.
  • the first lens L1 has positive refractive power and is made of plastic. Its object side surface S1 is convex at the optical axis, its object side S1 is concave at the circumference, and its image side S2 is convex at the optical axis and at the circumference. They are all aspherical.
  • the second lens L2 has positive refractive power and is made of plastic. Its object side surface S3 is convex at the optical axis and at the circumference, its image side surface S4 is convex at the optical axis, and its image side surface S4 is concave at the circumference. They are all aspherical.
  • the third lens L3 has negative refractive power and is made of plastic material. Its object side surface S5 is concave at the optical axis and at the circumference, and its image side surface S6 is concave at the optical axis and at the circumference, and both are aspherical.
  • the fourth lens L4 has positive refractive power and is made of plastic. Its object side surface S7 is convex at the optical axis, its object side surface S7 is concave at the circumference, and its image side surface S8 is convex at the optical axis and at the circumference. And they are all aspherical.
  • the fifth lens L5 has negative refractive power and is made of plastic. Its object side surface S9 is convex at the optical axis, its object side surface S9 is concave at the circumference, and its image side surface S10 is concave at the optical axis and at the circumference. They are all aspherical.
  • the sixth lens L6 has negative refractive power and is made of plastic. Its object side surface S11 is concave at the optical axis, its object side S11 is convex at the circumference, and its image side S12 is convex at the optical axis and at the circumference. They are all aspherical.
  • the seventh lens L7 has negative refractive power and is made of plastic material. Its object side surface S13 is convex at the optical axis and at the circumference, and its image side surface S14 is concave at the optical axis and at the circumference, and both are aspherical.
  • the eighth lens L8 has negative refractive power and is made of plastic. Its object side surface S15 is concave at the optical axis, its object side surface S15 is convex at the circumference, its image side surface S16 is convex at the optical axis, and its image side surface S16 It is concave on the circumference and all aspherical.
  • the stop STO can be located between the object plane of the optical system and the eighth lens.
  • the stop STO in this embodiment is arranged on the object side of the first lens L1 and can be used to control the amount of light entering.
  • the infrared filter element IRCF is arranged behind the eighth lens L8, including the object side S17 and the image side S18.
  • the infrared filter element IRCF is used to filter infrared light so that the light entering the imaging surface is visible light, and the wavelength of the visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging surface S19 is the surface on which the image formed by the light of the subject passes through the optical system.
  • Table 8a shows the characteristic table of the optical system of this embodiment, where the radius of curvature in this embodiment is the radius of curvature of each lens at the optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field angle of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis.
  • Table 8b shows the high order of the aspheric mirrors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 that can be used in the eighth embodiment
  • coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20, where each aspheric surface type can be defined by the formula given in the first embodiment.
  • FIG. 16 shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the eighth embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the lenses of the optical system
  • the astigmatism curve represents the meridional curvature of the image plane and the sagittal curvature of the image plane, where S represents the sagittal direction and T represents the meridional direction
  • the distortion curve represents the magnitude of distortion corresponding to different angles of view. According to FIG. 16, it can be seen that the optical system provided in the eighth embodiment can achieve good imaging quality.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the sixth lens L6 away from the fifth lens L5 is the image side 13.
  • the stop STO from the object side 12 to the image side 13, there are the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the Six lens L6, seventh lens L7, eighth lens L8, infrared filter element IRCF.
  • the first lens L1 has positive refractive power and is made of plastic. Its object side surface S1 is convex at the optical axis, its object side S1 is concave at the circumference, and its image side S2 is convex at the optical axis and at the circumference. They are all aspherical.
  • the second lens L2 has positive refractive power and is made of plastic material. Its object side surface S3 is convex at the optical axis and at the circumference, and its image side surface S4 is concave at the optical axis and at the circumference, and both are aspherical.
  • the third lens L3 has a negative refractive power and is made of plastic. Its object side surface S5 is convex at the optical axis, its object side surface S5 is concave at the circumference, and its image side surface S6 is concave at the optical axis and at the circumference. They are all aspherical.
  • the fourth lens L4 has positive refractive power and is made of plastic. Its object side surface S7 is concave at the optical axis, its object side surface S7 is convex at the circumference, and its image side surface S8 is convex at the optical axis and at the circumference. And they are all aspherical.
  • the fifth lens L5 has negative refractive power and is made of plastic. Its object side surface S9 is concave at the optical axis and at the circumference, its image side surface S10 is convex at the optical axis, and its image side surface S10 is concave at the circumference. They are all aspherical.
  • the sixth lens L6 has negative refractive power and is made of plastic. Its object side surface S11 is concave at the optical axis, its object side S11 is convex at the circumference, and its image side S12 is convex at the optical axis and at the circumference. They are all aspherical.
  • the seventh lens L7 has negative refractive power and is made of plastic. Its object side surface S13 is concave at the optical axis, its object side surface S13 is convex at the circumference, and its image side surface S14 is concave at the optical axis and at the circumference. They are all aspherical.
  • the eighth lens L8 has a negative refractive power and is made of plastic material. Its object side surface S15 is convex at the optical axis and at the circumference, and its image side surface S16 is concave at the optical axis and at the circumference, and both are aspherical.
  • the stop STO can be located between the object plane of the optical system and the eighth lens.
  • the stop STO in this embodiment is arranged on the object side of the first lens L1 and can be used to control the amount of light entering.
  • the infrared filter element IRCF is arranged behind the eighth lens L8, including the object side S17 and the image side S18.
  • the infrared filter element IRCF is used to filter infrared light so that the light entering the imaging surface is visible light, and the wavelength of the visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging surface S19 is the surface on which the image formed by the light of the subject passes through the optical system.
  • Table 9a shows a characteristic table of the optical system of this embodiment, where the radius of curvature in this embodiment is the radius of curvature of each lens at the optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field angle of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis.
  • Table 9b shows the high order of the aspheric mirrors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 that can be used in the ninth embodiment
  • FIG. 18 shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the ninth embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focal point of light rays of different wavelengths after passing through the lenses of the optical system
  • the astigmatism curve represents the meridional field curvature and the sagittal field curvature, where S represents the sagittal direction and T represents the meridional direction
  • the distortion curve represents the magnitude of distortion corresponding to different angles of view. According to FIG. 18, it can be seen that the optical system provided in the ninth embodiment can achieve good imaging quality.
  • Table 10 shows the TTL/Imgh, TTL/f, f1/f28, FNO, (L81-L82)/2*L83, TTL/ct56, Imgh/tan (HFOV) of the optical systems of the first embodiment to the ninth embodiment Value.
  • each embodiment can satisfy: TTL/Imgh ⁇ 2.5, TTL/f ⁇ 1.1, -1.8 ⁇ f1/f28 ⁇ -0.5, FNO ⁇ 2.4, (L81-L82)/2*L83>0.7, TTL/ct56>4, Imgh/tan(HFOV)>5mm.
  • the optical system involved in this application is applied to the lens module 20 in the terminal device 30.
  • the terminal device 30 may be a mobile phone, a tablet computer, a drone, a computer, and other devices.
  • the photosensitive element of the lens module 20 is located on the image side of the optical system, and the lens module 20 is assembled inside the terminal device 30.
  • the present application provides a lens module, including a photosensitive element and the optical system provided in the present application.
  • the photosensitive element is located on the image side of the optical system, and is used to transmit light passing through the first lens to the eighth lens and incident on the electronic photosensitive element. The electrical signal converted into an image.
  • the electronic photosensitive element may be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or a charge-coupled device (Charge-coupled Device, CCD).
  • CMOS Complementary Metal Oxide Semiconductor
  • CCD Charge-coupled Device
  • This application also provides a terminal device, which includes the lens module provided in this application.
  • the terminal device can be a mobile phone, a tablet computer, a drone, a computer, etc.
  • the terminal device By installing the lens module in the terminal device, the terminal device has the characteristics of long focal length while meeting the miniature design, and has good imaging quality, so that the captured pictures have high image quality, high resolution and high definition. Spend.

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Abstract

一种光学系统、镜头模组及终端设备。光学系统包括从物侧至像侧依次排布的具有正屈折力的第一透镜(L1)，具有负屈折力的第三透镜(L3)，具有屈折力的第二透镜(L2)、第四透镜(L4)、第五透镜(L5)、第六透镜(L6)、第七透镜(L7)和第八透镜(L8)，第一透镜(L1)的物侧面(S1)于光轴(11)处为凸面，第三透镜(L3)的像侧面(S6)于光轴(11)处为凹面，第四透镜(L4)的像侧面(S8)于光轴(11)处为凸面；光学系统满足以下条件式：TTL/f<1.1，TTL为第一透镜(L1)的物侧面(S1)至光学系统的成像面(S19)于光轴(11)上的距离，f为光学系统的焦距。通过合理配置光学系统中第一透镜(L1)至第八透镜(L8)的屈折力与面型及限定TTL/f<1.1，在满足微型设计的同时，使得光学系统具有长焦距的特性，并具有良好的成像质量。

Description

光学系统、镜头模组及终端设备 技术领域
本申请属于光学成像技术领域，尤其涉及一种光学系统、镜头模组及终端设备。
背景技术
随着手机、平板电脑、无人机、计算机等电子产品在生活中的广泛应用，各种科技改进推陈出新。其中，新型电子产品中摄像镜头拍摄效果的改进创新成为人们关注的重点。
目前的摄像镜头通常需要具有微型化的特征，随着远景拍摄需求的增大，摄像镜头需要具有长焦距，但容易出现清晰度不足，画质不佳等问题，导致远景摄影效果不理想。
因此，如何在满足微型设计的同时，增大焦距，提高像质，以使物距较远的景象清晰的成像于成像面上应为业界的研发方向。
发明内容
本申请实施例提供一种光学系统、镜头模组及终端设备，该光学系统在满足微型设计的同时，增大了系统焦距，提高了像质，甚至暗光条件下也能拍摄出画质清晰的图片。
第一方面，本申请实施例提供了一种光学系统，光学系统包括多个透镜，所述多个透镜包括从物侧(物侧是指光线射入的一侧)至像侧(像侧是指光线射出的一侧)依次排布的第一透镜、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，其中，所述第一透镜具有正屈折力，所述第三透镜具有负屈折力，其余所述透镜具有屈折力；所述第一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，所述第四透镜的像侧面于光轴处为凸面。其中，屈折力即为光焦度，表征光学系统偏折光线的能力，第二透镜、第四透镜、第五透镜、第六透镜、第七透镜和第八透镜具有屈折力是指第二透镜、第四透镜、第五透镜、第六透镜、第七透镜和第八透镜可以具有正屈折力，也可以具有负屈折力，正屈折力表示透镜对光束起汇聚作用，负屈折力表示透镜对光束起发散作用。例如，一种优选的实施方式中八个透镜的屈折力可以为，第一透镜具有正屈折力，第二透镜具有负屈折力，第三透镜具有负屈折力，第四透镜具有正屈折力，第五透镜具有负屈折力，第六透镜具有负屈折力，第七透镜具有负屈折力，第八透镜L8具有正屈折力，八个透镜的屈折力也可以为其他优选的组合。当透镜不具有屈折力时，即光焦度为零的情况下，即为平面折射，这时，沿轴平行光束经折射后仍是沿轴平行光束，不出现屈折现象。所述光学系统满足以下条件式：TTL/f<1.1，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，f为所述光学系统的焦距。
本申请通过合理配置光学系统中第一透镜至第八透镜的屈折力与第一透镜、第三透镜和第四透镜的面型及限定TTL/f<1.1，在满足微型设计的同时，使得光学系统具有长焦距的特性，并具有良好的成像质量，使拍摄的画面具有高画质感、高分辨率和高清晰度。
一种实施方式中，所有的所述透镜的物侧面和像侧面均为非球面，有利于校正光学系统的球差，提高光学系统的成像质量。
一种实施方式中，所述光学系统满足条件式：-1.8<f1/f28<-0.5，f1为所述第一透镜的焦距，f28为所述第二透镜至所述第八透镜的组合焦距。通过限定f1/f28的合理范围，有利于光学系 统第一透镜至第八透镜光焦度的合理分配，能更好的校正系统色差，提升系统的成像性能。
一种实施方式中，所述光学系统满足条件式：TTL/ct56>4，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，ct56为所述第五透镜的物侧面至所述第六透镜的像侧面于光轴上的距离。通过合理限制TTL/ct56的范围，可以使光学系统的多个透镜紧凑排布，只需在第五透镜和第六透镜之间设置厚隔圈，可以减少配件的数量，从而降低系统公差。
一种实施方式中，所述光学系统满足条件式：(L81-L82)/2*L83＞0.7，一束光线入射至所述光学系统的成像面的离光轴的最远点，所述光线与所述第八透镜的像侧面有第一交点，L81为所述第一交点至所述第一交点于光轴上的垂直投影点的最大距离，L82为所述第一交点至所述第一交点于光轴上的垂直投影点的最小距离，一束光线入射至所述光学系统的成像面的中心点，所述光线与所述第八透镜的像侧面有第二交点，L83为所述第二交点至所述第二交点于光轴上的垂直投影点的最大距离。通过限制(L81-L82)/2*L83的合适范围，有利于提升光学系统的相对亮度，在较暗环境下拍摄，也能达到清晰的成像效果。
一种实施方式中，所述光学系统满足条件式：TTL/Imgh<2.5，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，Imgh为所述光学系统最大视场角的一半所对应的像高。在成像面固定的情况下，限定TTL/Imgh小于2.5，可以缩小光学系统的总长，实现光学系统小型化的要求。
一种实施方式中，所述光学系统满足条件式：FNO<2.4，FNO为所述光学系统的光圈数。通过限定光学系统的光圈数，可以在光学系统具有长焦距的情况下，还能获取大光通量，即使在较暗环境下拍摄，也能达到清晰的成像效果。
一种实施方式中，所述光学系统满足条件式：Imgh/tan(HFOV)>5mm，Imgh为所述光学系统最大视场角的一半所对应的像高，tan(HFOV)为所述光学系统的最大视场角一半的正切值。通过限定Imgh/tan(HFOV)的范围，可以使系统具有长焦距的特性，增大成像的放大倍率，有利于远景拍摄。
第二方面，本申请提供一种镜头模组，包括感光元件和前述任意一种实施方式所述的光学系统，所述感光元件位于所述光学系统的像侧。
第三方面，本申请提供一种终端设备，包括所述的镜头模组。
通过合理配置光学系统中第一透镜至第八透镜的屈折力与第一透镜、第三透镜和第四透镜的面型及限定TTL/f<1.1，在满足微型设计的同时，使得光学系统具有长焦距的特性，并具有良好的成像质量，甚至暗光条件下也能拍摄出画质清晰的图片，使拍摄的画面具有高画质感、高分辨率和高清晰度。
附图说明
为了更清楚地说明本申请实施例或背景技术中的技术方案，下面将对本申请实施例或背景技术中所需要使用的附图进行说明。
图1是本申请第一实施例提供的光学系统的结构示意图；
图2是第一实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线；
图3是本申请第二实施例提供的光学系统的结构示意图；
图4是第二实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线；
图5是本申请第三实施例提供的光学系统的结构示意图；
图6是第三实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线；
图7是本申请第四实施例提供的光学系统的结构示意图；
图8是第四实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线；
图9是本申请第五实施例提供的光学系统的结构示意图；
图10是第五实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线；
图11是本申请第六实施例提供的光学系统的结构示意图；
图12是第六实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线；
图13是本申请第七实施例提供的光学系统的结构示意图；
图14是第七实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线；
图15是本申请第八实施例提供的光学系统的结构示意图；
图16是第八实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线；
图17是本申请第九实施例提供的光学系统的结构示意图；
图18是第九实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线；
图19是本申请提供的光学系统应用在终端设备中的示意图。
具体实施方式
下面结合本申请中的附图对本申请实施例进行描述。
本申请提供的一种光学系统包括八个透镜，八个透镜从物侧至像侧依序分布分别为第一透镜、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。
具体的，八片透镜的面型及屈折力如下：
所述第一透镜具有正屈折力，所述第三透镜具有负屈折力，其余所述透镜具有屈折力；所述第一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，所述第四透镜的像侧面于光轴处为凸面。
所述光学系统满足以下条件式：TTL/f<1.1，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，f为所述光学系统的焦距。
合理配置光学系统中第一透镜至第八透镜的屈折力与第一透镜、第三透镜和第四透镜的面型及限定TTL/f<1.1，在满足微型设计的同时，使得光学系统具有长焦距的特性，并具有良好的成像质量，使拍摄的画面具有高画质感、高分辨率和高清晰度。
一种实施方式中，所有的所述透镜的物侧面和像侧面均为非球面，有利于校正光学系统的球差，提高光学系统的成像质量。
一种实施方式中，所述光学系统满足条件式：-1.8<f1/f28<-0.5，f1为所述第一透镜的焦距，f28为所述第二透镜至所述第八透镜的组合焦距。通过限定f1/f28的合理范围，有利于光学系统第一透镜至第八透镜光焦度的合理分配，能更好的校正系统色差，提升系统的成像性能。
一种实施方式中，所述光学系统满足条件式：TTL/ct56>4，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，ct56为所述第五透镜的物侧面至所述第六透镜的像侧面于光轴上的距离。通过合理限制TTL/ct56的范围，可以使光学系统的多个透镜紧凑排布，只需在第五透镜和第六透镜之间设置厚隔圈，可以减少配件的数量，从而降低系统公差。
一种实施方式中，所述光学系统满足条件式：(L81-L82)/2*L83＞0.7，一束光线入射至所述光学系统的成像面的离光轴的最远点，所述光线与所述第八透镜的像侧面有第一交点，L81为所述第一交点至所述第一交点于光轴上的垂直投影点的最大距离，L82为所述第一交点至所述第一交点于光轴上的垂直投影点的最小距离，一束光线入射至所述光学系统的成像面的中心点，所述光线与所述第八透镜的像侧面有第二交点，L83为所述第二交点至所述第二交点于光轴上的垂直投影点的最大距离。通过限制(L81-L82)/2*L83的合适范围，有利于提升光学系统的相对亮度，在较暗环境下拍摄，也能达到清晰的成像效果。
一种实施方式中，所述光学系统满足条件式：TTL/Imgh<2.5，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，Imgh为所述光学系统最大视场角的一半所对应的像高。在成像面固定的情况下，限定TTL/Imgh小于2.5，可以缩小光学系统的总长，实现光学系统小型化的要求。
一种实施方式中，所述光学系统满足条件式：FNO<2.4，FNO为所述光学系统的光圈数。通过限定光学系统的光圈数，可以在光学系统具有长焦距的情况下，还能获取大光通量，即使在较暗环境下拍摄，也能达到清晰的成像效果。
一种实施方式中，所述光学系统满足条件式：Imgh/tan(HFOV)>5mm，Imgh为所述光学系统最大视场角的一半所对应的像高，tan(HFOV)为所述光学系统的最大视场角一半的正切值。通过限定Imgh/tan(HFOV)的范围，可以使系统具有长焦距的特性，增大成像的放大倍率，有利于远景拍摄。
以下通过九个具体的实施例对本申请进行详细的说明。
实施例一
如图1所示，直线11表示光轴，第一个透镜L1远离第二透镜L2的一侧为物侧12，第六透镜L6远离第五透镜L5的一侧为像侧13。本实施例提供的光学系统中，从物侧12到像侧13依次为光阑STO、第一个透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7、第八透镜L8、红外滤光元件IRCF。
第一透镜L1具有正屈折力，且为塑料材质，其物侧面S1于光轴处为凸面，其物侧面S1于圆周处为凹面，其像侧面S2于光轴处和于圆周处为凸面，并皆为非球面。
第二透镜L2具有负屈折力，且为塑料材质，其物侧面S3于光轴处和于圆周处为凸面，其像侧面S4于光轴处和于圆周处为凹面，并皆为非球面。
第三透镜L3具有负屈折力，且为塑料材质，其物侧面S5于光轴处和于圆周处为凸面，其像侧面S6于光轴处和于圆周处为凹面，并皆为非球面。
第四透镜L4具有正屈折力，且为塑料材质，其物侧面S7于光轴处和于圆周处为凹面，其像侧面S8于光轴处和于圆周处为凸面，且皆为非球面。
第五透镜L5具有负屈折力，且为塑料材质，其物侧面S9于光轴处为凸面，其物侧面S9于圆周处为凹面，其像侧面S10于光轴处和于圆周处为凹面，并皆为非球面。
第六透镜L6具有负屈折力，且为塑料材质，其物侧面S11于光轴处为凹面，其物侧面S11于圆周处为凸面，其像侧面S12于光轴处和于圆周处为凹面，并皆为非球面。
第七透镜L7具有负屈折力，且为塑料材质，其物侧面S13于光轴处为凸面，其物侧面S13于圆周处为凹面，其像侧面S14于光轴处和于圆周处为凹面，并皆为非球面。
第八透镜L8具有正屈折力，且为塑料材质，其物侧面S15于光轴处为凸面，其物侧面S15于圆周处为凹面，其像侧面S16于光轴处为凹面，其像侧面S16于圆周处为凸面，并皆为非球面。
光阑STO可以位于光学系统物面与第八透镜之间，本实施例中的光阑STO设置在第一透镜L1的物侧面，可以用于控制进光量。
红外滤光元件IRCF设置在第八透镜L8之后，包括物侧面S17和像侧面S18，红外滤光元件IRCF用于过滤掉红外光线，使得射入成像面的光线为可见光，可见光的波长为380nm-780nm，红外滤光元件IRCF的材质为玻璃。
成像面S19为被摄物体的光通过光学系统后形成的像所在的面。
表1a示出了本实施例的光学系统的特性表格，其中，本实施例中的曲率半径是各透镜于光轴处的曲率半径。
表1a
Figure PCTCN2020096368-appb-000001
Figure PCTCN2020096368-appb-000002
其中，f为光学系统的焦距，FNO为光学系统的光圈数，FOV为光学系统的最大视场角，TTL为第一透镜的物侧面至光学系统的成像面于光轴上的距离。
在本实施例中，第一透镜L1至第八透镜L8的任意一个透镜的物侧面和像侧面均为非球面，各非球面透镜的面型可利用但不限于以下非球面公式进行限定：
Figure PCTCN2020096368-appb-000003
其中，Z是非球面上相应点到与表面顶点相切的平面的距离，r是非球面上相应点到光轴的距离，c是非球面顶点的曲率，k是圆锥常数，Ai为非球面面型公式中与第i项高次项相对应的系数。
表1b给出了可用于第一实施例中各非球面镜面S1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13、S14、S15、S16的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。
表1b
面序号 K A4 A6 A8 A10
S1 -1.9167 0.0493 0.0023 -0.0100 0.0370
S2 -59.0874 0.0549 -0.1015 0.3000 -0.5621
S3 -45.8548 -0.0273 -0.1360 0.6850 -1.5104
S4 -47.5683 -0.1153 0.2552 0.4660 -3.6495
S5 -47.3597 -0.1349 0.6083 -0.8172 -1.5072
S6 -5.3495 -0.0384 0.3406 -0.9487 0.5243
S7 99.0000 0.1476 0.0347 0.0946 -1.8368
S8 -49.4360 0.2719 -0.1759 0.3938 -0.1555
S9 89.0000 0.0197 -0.3298 1.1048 -1.5111
S10 -78.4730 -0.0849 0.0320 0.0923 -0.1038
S11 9.0840 -0.0504 -0.0414 0.0109 0.0422
S12 -15.9338 -0.0309 0.1600 -0.3557 0.3598
S13 -99.0000 -0.0451 0.2708 -0.5174 0.4911
S14 -28.9442 -0.0511 0.0628 -0.0907 0.0603
S15 -8.8074 -0.0692 0.0113 0.0081 -0.0034
S16 -42.9930 -0.0805 0.0227 -0.0159 0.0207
面序号 A12 A14 A16 A18 A20
S1 -0.0602 0.0572 -0.0319 0.0098 -0.0013
S2 0.6635 -0.4862 0.2113 -0.0496 0.0048
S3 2.0439 -1.7241 0.8733 -0.2422 0.0284
S4 8.4302 -10.3359 7.2494 -2.7550 0.4418
S5 6.6145 -9.8885 7.7885 -3.2384 0.5613
S6 2.2030 -5.9521 7.3572 -4.7450 1.2890
S7 6.0015 -11.9877 14.0404 -8.5587 2.1008
S8 -0.5830 1.0639 -1.7021 1.7020 -0.6417
S9 0.9210 2.2439 -5.8808 4.9978 -1.4934
S10 0.1999 -0.2225 0.0818 0.0867 -0.0666
S11 -0.0958 0.1004 -0.0558 0.0159 -0.0018
S12 -0.2137 0.0778 -0.0169 0.0020 -0.0001
S13 -0.2743 0.0942 -0.0196 0.0023 -0.0001
S14 -0.0185 0.0015 0.0005 -0.0001 0.0000
S15 -0.0011 0.0008 -0.0002 0.0000 0.0000
S16 -0.0137 0.0047 -0.0009 0.0001 0.0000
图2示出了第一实施例的光学系统的纵向球差曲线、像散曲线、畸变曲线。其中，纵向球差曲线表示不同波长的光线经由光学系统的各透镜后的会聚焦点偏离；像散曲线表示子午像面弯曲和弧矢像面弯曲，其中，S表示弧矢方向，T表示子午方向；畸变曲线表示不同视场角对应的畸变大小值。根据图2可知，第一实施例所给出的光学系统能够实现良好的成像品质。
实施例二
如图3所示，直线11表示光轴，第一个透镜L1远离第二透镜L2的一侧为物侧12，第六透镜L6远离第五透镜L5的一侧为像侧13。本实施例提供的光学系统中，从物侧12到像侧13依次为光阑STO、第一个透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7、第八透镜L8、红外滤光元件IRCF。
第一透镜L1具有正屈折力，且为塑料材质，其物侧面S1于光轴处为凸面，其物侧面S1于圆周处为凹面，其像侧面S2于光轴处和于圆周处为凸面，并皆为非球面。
第二透镜L2具有正屈折力，且为塑料材质，其物侧面S3于光轴处和于圆周处为凸面，其像侧面S4于光轴处和于圆周处为凹面，并皆为非球面。
第三透镜L3具有负屈折力，且为塑料材质，其物侧面S5于光轴处为凸面，其物侧面S5于圆周处为凹面，其像侧面S6于光轴处和于圆周处为凹面，并皆为非球面。
第四透镜L4具有正屈折力，且为塑料材质，其物侧面S7于光轴处和于圆周处为凹面，其像侧面S8于光轴处和于圆周处为凸面，且皆为非球面。
第五透镜L5具有负屈折力，且为塑料材质，其物侧面S9于光轴处为凸面，其物侧面S9于圆周处为凹面，其像侧面S10于光轴处和于圆周处为凹面，并皆为非球面。
第六透镜L6具有负屈折力，且为塑料材质，其物侧面S11于光轴处为凹面，其物侧面S11于圆周处为凸面，其像侧面S12于光轴处为凹面，其像侧面S12于圆周处为凸面，并皆为非球面。
第七透镜L7具有负屈折力，且为塑料材质，其物侧面S13于光轴处和于圆周处为凹面，其 像侧面S14于光轴处凸面，其像侧面S14于圆周处为凹面，并皆为非球面。
第八透镜L8具有负屈折力，且为塑料材质，其物侧面S15于光轴处和于圆周处为凹面，其像侧面S16于光轴处和于圆周处为凸面，并皆为非球面。
光阑STO可以位于光学系统物面与第八透镜之间，本实施例中的光阑STO设置在第一透镜L1的物侧面，可以用于控制进光量。
红外滤光元件IRCF设置在第八透镜L8之后，包括物侧面S17和像侧面S18，红外滤光元件IRCF用于过滤掉红外光线，使得射入成像面的光线为可见光，可见光的波长为380nm-780nm，红外滤光元件IRCF的材质为玻璃。
成像面S19为被摄物体的光通过光学系统后形成的像所在的面。
表2a示出了本实施例的光学系统的特性表格，其中，本实施例中的曲率半径是各透镜于光轴处的曲率半径。
表2a
Figure PCTCN2020096368-appb-000004
Figure PCTCN2020096368-appb-000005
其中，f为光学系统的焦距，FNO为光学系统的光圈数，FOV为光学系统的最大视场角，TTL为第一透镜的物侧面至光学系统的成像面于光轴上的距离。
表2b给出了可用于第二实施例中各非球面镜面S1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13、S14、S15、S16的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20，其中，各非球面面型可由第一实施例中给出的公式限定。
表2b
面序号 K A4 A6 A8 A10
S1 -1.9479 0.0505 -0.0009 0.0024 0.0085
S2 -11.9542 0.0683 -0.0993 0.1527 -0.1549
S3 -47.2559 -0.0230 -0.0396 0.2310 -0.5816
S4 -46.4325 -0.1889 0.8856 -1.9025 1.7000
S5 -51.5185 -0.2239 1.3684 -3.7872 5.6064
S6 -4.8671 -0.0642 0.6262 -2.2513 4.2639
S7 88.9782 0.1537 -0.0530 0.4559 -3.1044
S8 -41.1948 0.3226 -0.6826 2.6405 -7.5873
S9 89.0000 0.0899 -0.8021 2.9999 -7.1791
S10 -78.4730 -0.0740 -0.0301 0.2420 -0.3877
S11 9.0840 -0.0605 -0.0607 0.0519 0.0049
S12 -35.5530 0.0356 -0.1070 0.0458 0.0241
S13 -47.0768 0.0703 -0.0792 -0.0588 0.1391
S14 -42.9930 0.1047 -0.2348 0.2155 -0.1313
S15 0.0000 0.0140 -0.1533 0.1846 -0.1078
S16 0.0000 -0.0758 -0.0019 0.0167 0.0007
面序号 A12 A14 A16 A18 A20
S1 -0.0218 0.0264 -0.0174 0.0062 -0.0009
S2 0.0745 0.0386 -0.0754 0.0375 -0.0063
S3 0.8961 -0.8032 0.4080 -0.1098 0.0125
S4 0.4761 -2.4945 2.3318 -0.9856 0.1648
S5 -4.5224 1.5391 0.3680 -0.4713 0.1103
S6 -4.8463 2.9917 -0.2236 -0.8469 0.3784
S7 9.3678 -17.0488 17.9269 -9.8625 2.2015
S8 16.6425 -24.7168 21.8619 -10.2644 1.9550
S9 12.8321 -14.6925 9.4920 -2.9603 0.2857
S10 0.5695 -0.5943 0.3928 -0.1169 0.0005
S11 -0.0760 0.0869 -0.0451 0.0115 -0.0012
S12 -0.0456 0.0268 -0.0078 0.0011 -0.0001
S13 -0.1044 0.0422 -0.0098 0.0012 -0.0001
S14 0.0580 -0.0181 0.0037 -0.0004 0.0000
S15 0.0341 -0.0058 0.0005 0.0000 0.0000
S16 -0.0067 0.0033 -0.0007 0.0001 0.0000
图4示出了第二实施例的光学系统的纵向球差曲线、像散曲线、畸变曲线。其中，纵向球差曲线表示不同波长的光线经由光学系统的各透镜后的会聚焦点偏离；像散曲线表示子午像面弯曲和弧矢像面弯曲，其中，S表示弧矢方向，T表示子午方向；畸变曲线表示不同视场角对应的畸变大小值。根据图4可知，第二实施例所给出的光学系统能够实现良好的成像品质。
实施例三
如图5所示，直线11表示光轴，第一个透镜L1远离第二透镜L2的一侧为物侧12，第六透镜L6远离第五透镜L5的一侧为像侧13。本实施例提供的光学系统中，从物侧12到像侧13依次为光阑STO、第一个透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7、第八透镜L8、红外滤光元件IRCF。
第一透镜L1具有正屈折力，且为塑料材质，其物侧面S1于光轴处为凸面，其物侧面S1于圆周处为凹面，其像侧面S2于光轴处和于圆周处为凸面，并皆为非球面。
第二透镜L2具有负屈折力，且为塑料材质，其物侧面S3于光轴处和于圆周处为凸面，其像侧面S4于光轴处和于圆周处为凹面，并皆为非球面。
第三透镜L3具有负屈折力，且为塑料材质，其物侧面S5于光轴处为凸面，其物侧面S5于圆周处为凹面，其像侧面S6于光轴处和于圆周处为凹面，并皆为非球面。
第四透镜L4具有正屈折力，且为塑料材质，其物侧面S7于光轴处和于圆周处为凹面，其像侧面S8于光轴处和于圆周处为凸面，且皆为非球面。
第五透镜L5具有负屈折力，且为塑料材质，其物侧面S9于光轴处和于圆周处为凸面，其像侧面S10于光轴处和于圆周处为凹面，并皆为非球面。
第六透镜L6具有负屈折力，且为塑料材质，其物侧面S11于光轴处为凹面，其物侧面S11于圆周处为凸面，其像侧面S12于光轴处为凹面，其像侧面S12于圆周处为凸面，并皆为非球面。
第七透镜L7具有负屈折力，且为塑料材质，其物侧面S13于光轴处和于圆周处为凹面，其像侧面S14于光轴处和于圆周处为凸面，并皆为非球面。
第八透镜L8具有正屈折力，且为塑料材质，其物侧面S15于光轴处为凸面，其物侧面S15于圆周处为凹面，其像侧面S16于光轴处和于圆周处为凹面，并皆为非球面。
光阑STO可以位于光学系统物面与第八透镜之间，本实施例中的光阑STO设置在第一透镜L1的物侧面，可以用于控制进光量。
红外滤光元件IRCF设置在第八透镜L8之后，包括物侧面S17和像侧面S18，红外滤光元件IRCF用于过滤掉红外光线，使得射入成像面的光线为可见光，可见光的波长为380nm-780nm，红外滤光元件IRCF的材质为玻璃。
成像面S19为被摄物体的光通过光学系统后形成的像所在的面。
表3a示出了本实施例的光学系统的特性表格，其中，本实施例中的曲率半径是各透镜于光轴处的曲率半径。
表3a
Figure PCTCN2020096368-appb-000006
其中，f为光学系统的焦距，FNO为光学系统的光圈数，FOV为光学系统的最大视场角，TTL为第一透镜的物侧面至光学系统的成像面于光轴上的距离。
表3b给出了可用于第三实施例中各非球面镜面S1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13、S14、S15、S16的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20，其中，各非球面面型可由第一实施例中给出的公式限定。
表3b
面序号 K A4 A6 A8 A10
S1 -1.5927 0.0383 0.0058 -0.0150 0.0374
S2 -0.5411 0.0728 -0.0943 0.0780 0.0068
S3 -54.0522 -0.0228 0.0443 -0.2186 0.4926
S4 -52.8856 -0.1064 0.5556 -1.4723 1.9014
S5 -50.3669 -0.0536 0.4573 -0.8476 -1.0347
S6 -5.3633 -0.0628 0.6052 -1.9371 3.4718
S7 97.1066 0.1124 -0.0865 0.7395 -3.5234
S8 -26.4300 0.2440 -0.5512 2.2389 -6.4464
S9 89.0000 0.0871 -0.6040 1.9220 -3.8201
S10 -78.4730 -0.0499 -0.0998 0.3176 -0.3732
S11 -5.6393 0.0002 -0.2762 0.4536 -0.4762
S12 -0.4504 0.1226 -0.4444 0.6009 -0.5452
S13 -13.2306 0.1168 -0.2188 0.0977 0.0475
S14 -42.9930 -0.0504 0.1287 -0.2262 0.2036
S15 -1.3708 -0.1396 0.1671 -0.1518 0.1022
S16 -17.6617 -0.1058 0.0483 -0.0270 0.0214
面序号 A12 A14 A16 A18 A20
S1 -0.0497 0.0401 -0.0194 0.0052 -0.0006
S2 -0.0913 0.1070 -0.0636 0.0196 -0.0024
S3 -0.5896 0.4458 -0.2197 0.0644 -0.0083
S4 -1.0027 -0.2168 0.5265 -0.2325 0.0337
S5 5.6308 -8.6056 6.6739 -2.6768 0.4410
S6 -5.3002 7.6411 -8.1037 4.9782 -1.2817
S7 8.7537 -13.5185 12.4727 -6.1117 1.2047
S8 13.9810 -20.5251 18.2451 -8.7741 1.7471
S9 6.1392 -7.1828 5.2685 -2.1178 0.3542
S10 0.3081 -0.1594 0.0260 0.0174 -0.0071
S11 0.2617 -0.0256 -0.0437 0.0204 -0.0028
S12 0.3297 -0.1293 0.0317 -0.0045 0.0003
S13 -0.0734 0.0361 -0.0091 0.0012 -0.0001
S14 -0.1062 0.0336 -0.0064 0.0007 0.0000
S15 -0.0503 0.0166 -0.0034 0.0004 0.0000
S16 -0.0130 0.0045 -0.0009 0.0001 0.0000
图6示出了第三实施例的光学系统的纵向球差曲线、像散曲线、畸变曲线。其中，纵向球差曲线表示不同波长的光线经由光学系统的各透镜后的会聚焦点偏离；像散曲线表示子午像面 弯曲和弧矢像面弯曲，其中，S表示弧矢方向，T表示子午方向；畸变曲线表示不同视场角对应的畸变大小值。根据图6可知，第三实施例所给出的光学系统能够实现良好的成像品质。
实施例四
如图7所示，直线11表示光轴，第一个透镜L1远离第二透镜L2的一侧为物侧12，第六透镜L6远离第五透镜L5的一侧为像侧13。本实施例提供的光学系统中，从物侧12到像侧13依次为光阑STO、第一个透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7、第八透镜L8、红外滤光元件IRCF。
第一透镜L1具有正屈折力，且为塑料材质，其物侧面S1于光轴处为凸面，其物侧面S1于圆周处为凹面，其像侧面S2于光轴处和于圆周处为凸面，并皆为非球面。
第二透镜L2具有负屈折力，且为塑料材质，其物侧面S3于光轴处和于圆周处为凸面，其像侧面S4于光轴处为凹面，其像侧面S4于圆周处为凸面，并皆为非球面。
第三透镜L3具有负屈折力，且为塑料材质，其物侧面S5于光轴处为凸面，其物侧面S5于圆周处为凹面，其像侧面S6于光轴处和于圆周处为凹面，并皆为非球面。
第四透镜L4具有正屈折力，且为塑料材质，其物侧面S7于光轴处和于圆周处为凹面，其像侧面S8于光轴处和于圆周处为凸面，且皆为非球面。
第五透镜L5具有负屈折力，且为塑料材质，其物侧面S9于光轴处为凸面，其物侧面S9于圆周处为凹面，其像侧面S10于光轴处和于圆周处为凹面，并皆为非球面。
第六透镜L6具有负屈折力，且为塑料材质，其物侧面S11于光轴处为凹面，其物侧面S11于圆周处为凸面，其像侧面S12于光轴处为凹面，其像侧面S12于圆周处为凸面，并皆为非球面。
第七透镜L7具有负屈折力，且为塑料材质，其物侧面S13于光轴处为凹面，其物侧面S13于圆周处为凸面，其像侧面S14于光轴处为凸面，其像侧面S14于圆周处为凹面，并皆为非球面。
第八透镜L8具有正屈折力，且为塑料材质，其物侧面S15于光轴处为凸面，其物侧面S15于圆周处为凹面，其像侧面S16于光轴处和于圆周处为凹面，并皆为非球面。
光阑STO可以位于光学系统物面与第八透镜之间，本实施例中的光阑STO设置在第一透镜L1的物侧面，可以用于控制进光量。
红外滤光元件IRCF设置在第八透镜L8之后，包括物侧面S17和像侧面S18，红外滤光元件IRCF用于过滤掉红外光线，使得射入成像面的光线为可见光，可见光的波长为380nm-780nm，红外滤光元件IRCF的材质为玻璃。
成像面S19为被摄物体的光通过光学系统后形成的像所在的面。
表4a示出了本实施例的光学系统的特性表格，其中，本实施例中的曲率半径是各透镜于光轴处的曲率半径。
表4a
Figure PCTCN2020096368-appb-000007
Figure PCTCN2020096368-appb-000008
其中，f为光学系统的焦距，FNO为光学系统的光圈数，FOV为光学系统的最大视场角，TTL为第一透镜的物侧面至光学系统的成像面于光轴上的距离。
表4b给出了可用于第四实施例中各非球面镜面S1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13、S14、S15、S16的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20，其中，各非球面面型可由第一实施例中给出的公式限定。
表4b
面序号 K A4 A6 A8 A10
S1 -1.5636 0.0355 0.0054 -0.0126 0.0294
S2 0.0000 0.0771 -0.1579 0.2695 -0.2949
S3 -56.0803 0.0060 -0.1572 0.3716 -0.4512
S4 -51.3989 -0.0401 0.1795 -0.5621 0.9415
S5 -48.6695 -0.0038 0.2449 -0.7671 0.4867
S6 -5.1051 -0.0242 0.3469 -1.0262 0.9566
S7 99.0000 0.1102 -0.0816 0.7539 -3.4752
S8 -23.2829 0.2422 -0.5116 2.1426 -6.1813
S9 99.0000 0.0806 -0.5613 1.9192 -4.2412
S10 -75.0985 -0.0627 -0.0578 0.2224 -0.3058
S11 -8.6334 -0.0302 -0.1899 0.2739 -0.2049
S12 -1.8377 0.0766 -0.3297 0.4264 -0.3639
S13 -12.7719 0.1039 -0.1744 0.0252 0.1122
S14 -42.9930 -0.0031 0.0109 -0.0977 0.1227
S15 0.0000 -0.1092 0.0639 -0.0181 0.0100
S16 0.0000 -0.1058 0.0270 0.0126 -0.0120
面序号 A12 A14 A16 A18 A20
S1 -0.0372 0.0288 -0.0134 0.0034 -0.0004
S2 0.2033 -0.0823 0.0157 -0.0001 -0.0003
S3 0.3262 -0.1199 0.0037 0.0116 -0.0026
S4 -1.0472 0.9293 -0.6310 0.2641 -0.0478
S5 0.8756 -1.7441 1.2607 -0.4196 0.0514
S6 0.7158 -2.8909 3.5604 -2.2249 0.6004
S7 8.4776 -12.9149 11.7604 -5.7623 1.1708
S8 13.0270 -18.4456 15.7485 -7.2375 1.3696
S9 7.2271 -8.4581 6.0692 -2.3762 0.3869
S10 0.3394 -0.2554 0.1099 -0.0150 -0.0030
S11 -0.0223 0.1676 -0.1242 0.0390 -0.0046
S12 0.2020 -0.0704 0.0150 -0.0018 0.0001
S13 -0.1081 0.0477 -0.0115 0.0015 -0.0001
S14 -0.0749 0.0262 -0.0054 0.0006 0.0000
S15 -0.0125 0.0069 -0.0018 0.0002 0.0000
S16 0.0037 -0.0008 0.0002 0.0000 0.0000
图8示出了第四实施例的光学系统的纵向球差曲线、像散曲线、畸变曲线。其中，纵向球差曲线表示不同波长的光线经由光学系统的各透镜后的会聚焦点偏离；像散曲线表示子午像面弯曲和弧矢像面弯曲，其中，S表示弧矢方向，T表示子午方向；畸变曲线表示不同视场角对应的畸变大小值。根据图8可知，第四实施例所给出的光学系统能够实现良好的成像品质。
实施例五
如图9所示，直线11表示光轴，第一个透镜L1远离第二透镜L2的一侧为物侧12，第六透镜L6远离第五透镜L5的一侧为像侧13。本实施例提供的光学系统中，从物侧12到像侧13依次为光阑STO、第一个透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7、第八透镜L8、红外滤光元件IRCF。
第一透镜L1具有正屈折力，且为塑料材质，其物侧面S1于光轴处为凸面，其物侧面S1于 圆周处为凹面，其像侧面S2于光轴处为凹面，其像侧面S2于圆周处为凸面，并皆为非球面。
第二透镜L2具有负屈折力，且为塑料材质，其物侧面S3于光轴处为凹面，其物侧面S3于圆周处为凸面，其像侧面S4于光轴处和于圆周处为凹面，并皆为非球面。
第三透镜L3具有负屈折力，且为塑料材质，其物侧面S5于光轴处为凸面，其物侧面S5于圆周处为凹面，其像侧面S6于光轴处和于圆周处为凹面，并皆为非球面。
第四透镜L4具有正屈折力，且为塑料材质，其物侧面S7于光轴处和于圆周处为凹面，其像侧面S8于光轴处和于圆周处为凸面，且皆为非球面。
第五透镜L5具有负屈折力，且为塑料材质，其物侧面S9于光轴处和于圆周处为凹面，其像侧面S10于光轴处和于圆周处为凹面，并皆为非球面。
第六透镜L6具有负屈折力，且为塑料材质，其物侧面S11于光轴处为凹面，其物侧面S11于圆周处为凸面，其像侧面S12于光轴处为凹面，其像侧面S12于圆周处为凸面，并皆为非球面。
第七透镜L7具有负屈折力，且为塑料材质，其物侧面S13于光轴处为凹面，其物侧面S13于圆周处为凸面，其像侧面S14于光轴处为凹面，其像侧面S14于圆周处为凸面，并皆为非球面。
第八透镜L8具有正屈折力，且为塑料材质，其物侧面S15于光轴处为凸面，其物侧面S15于圆周处为凹面，其像侧面S16于光轴处和于圆周处为凹面，并皆为非球面。
光阑STO可以位于光学系统物面与第八透镜之间，本实施例中的光阑STO设置在第一透镜L1的物侧面，可以用于控制进光量。
红外滤光元件IRCF设置在第八透镜L8之后，包括物侧面S17和像侧面S18，红外滤光元件IRCF用于过滤掉红外光线，使得射入成像面的光线为可见光，可见光的波长为380nm-780nm，红外滤光元件IRCF的材质为玻璃。
成像面S19为被摄物体的光通过光学系统后形成的像所在的面。
表5a示出了本实施例的光学系统的特性表格，其中，本实施例中的曲率半径是各透镜于光轴处的曲率半径。
表5a
Figure PCTCN2020096368-appb-000009
Figure PCTCN2020096368-appb-000010
其中，f为光学系统的焦距，FNO为光学系统的光圈数，FOV为光学系统的最大视场角，TTL为第一透镜的物侧面至光学系统的成像面于光轴上的距离。
表5b给出了可用于第五实施例中各非球面镜面S1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13、S14、S15、S16的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20，其中，各非球面面型可由第一实施例中给出的公式限定。
表5b
面序号 K A4 A6 A8 A10
S1 -1.5978 0.0393 0.0047 -0.0128 0.0369
S2 -71.8670 0.0328 -0.0615 0.1477 -0.2630
S3 -57.0050 -0.0228 -0.0112 0.1657 -0.4843
S4 -54.3725 -0.0916 0.3060 -0.5030 0.0248
S5 -46.0877 0.0036 0.1888 -0.3189 -1.1230
S6 -5.4689 -0.0150 0.2618 -0.6150 -0.2433
S7 99.0000 0.1040 -0.1270 0.9463 -4.1104
S8 -25.1701 0.2853 -0.8470 3.1490 -8.1837
S9 89.0000 0.1734 -1.0035 3.1049 -6.4055
S10 -78.4730 -0.0541 -0.0855 0.1332 0.2380
S11 9.0840 -0.0140 -0.2146 0.3506 -0.3929
S12 -6.7839 0.0952 -0.3604 0.4737 -0.4300
S13 -13.5208 0.1225 -0.2419 0.1415 0.0018
S14 -42.9930 0.0038 -0.0445 0.0128 0.0201
S15 -42.9930 -0.1198 0.0758 0.0021 -0.0322
S16 -42.9930 -0.1144 0.0546 -0.0105 -0.0014
面序号 A12 A14 A16 A18 A20
S1 -0.0524 0.0442 -0.0221 0.0061 -0.0007
S2 0.3033 -0.2116 0.0849 -0.0180 0.0016
S3 0.7812 -0.7239 0.3856 -0.1103 0.0132
S4 1.1987 -1.9311 1.4302 -0.5299 0.0794
S5 4.2632 -6.2044 4.8187 -1.9783 0.3374
S6 2.8328 -5.2984 5.2347 -2.7963 0.6494
S7 10.2975 -16.3103 15.4598 -7.8789 1.6570
S8 15.9967 -21.4567 17.6709 -7.9488 1.4889
S9 9.9461 -10.7036 7.2022 -2.6817 0.4184
S10 -0.9250 1.3736 -1.1160 0.4888 -0.0898
S11 0.2581 -0.0730 -0.0071 0.0088 -0.0014
S12 0.2679 -0.1092 0.0277 -0.0040 0.0003
S13 -0.0435 0.0238 -0.0061 0.0008 0.0000
S14 -0.0208 0.0089 -0.0021 0.0003 0.0000
S15 0.0186 -0.0050 0.0007 -0.0001 0.0000
S16 -0.0001 0.0005 -0.0002 0.0000 0.0000
图10示出了第五实施例的光学系统的纵向球差曲线、像散曲线、畸变曲线。其中，纵向球差曲线表示不同波长的光线经由光学系统的各透镜后的会聚焦点偏离；像散曲线表示子午像面弯曲和弧矢像面弯曲，其中，S表示弧矢方向，T表示子午方向；畸变曲线表示不同视场角对应的畸变大小值。根据图10可知，第五实施例所给出的光学系统能够实现良好的成像品质。
实施例六
如图11所示，直线11表示光轴，第一个透镜L1远离第二透镜L2的一侧为物侧12，第六透镜L6远离第五透镜L5的一侧为像侧13。本实施例提供的光学系统中，从物侧12到像侧13依次为光阑STO、第一个透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7、第八透镜L8、红外滤光元件IRCF。
第一透镜L1具有正屈折力，且为塑料材质，其物侧面S1于光轴处为凸面，其物侧面S1于圆周处为凹面，其像侧面S2于光轴处和于圆周处为凸面，并皆为非球面。
第二透镜L2具有正屈折力，且为塑料材质，其物侧面S3于光轴处和于圆周处为凸面，其像侧面S4于光轴处和于圆周处为凹面，并皆为非球面。
第三透镜L3具有负屈折力，且为塑料材质，其物侧面S5于光轴处为凸面，其物侧面S5于圆周处为凹面，其像侧面S6于光轴处和于圆周处为凹面，并皆为非球面。
第四透镜L4具有正屈折力，且为塑料材质，其物侧面S7于光轴处为凸面，其物侧面S7于圆周处为凹面，其像侧面S8于光轴处和于圆周处为凸面，且皆为非球面。
第五透镜L5具有负屈折力，且为塑料材质，其物侧面S9于光轴处为凸面，其物侧面S9于 圆周处为凹面，其像侧面S10于光轴处和于圆周处为凹面，并皆为非球面。
第六透镜L6具有正屈折力，且为塑料材质，其物侧面S11于光轴处和于圆周处为凸面，其像侧面S12于光轴处为凹面，其像侧面S12于圆周处为凸面，并皆为非球面。
第七透镜L7具有正屈折力，且为塑料材质，其物侧面S13于光轴处和于圆周处为凸面，其像侧面S14于光轴处为凹面，其像侧面S14于圆周处为凸面，并皆为非球面。
第八透镜L8具有负屈折力，且为塑料材质，其物侧面S15于光轴处和于圆周处为凹面，其像侧面S16于光轴处为凸面，其像侧面S16于圆周处为凹面，并皆为非球面。
光阑STO可以位于光学系统物面与第八透镜之间，本实施例中的光阑STO设置在第一透镜L1的物侧面，可以用于控制进光量。
红外滤光元件IRCF设置在第八透镜L8之后，包括物侧面S17和像侧面S18，红外滤光元件IRCF用于过滤掉红外光线，使得射入成像面的光线为可见光，可见光的波长为380nm-780nm，红外滤光元件IRCF的材质为玻璃。
成像面S19为被摄物体的光通过光学系统后形成的像所在的面。
表6a示出了本实施例的光学系统的特性表格，其中，本实施例中的曲率半径是各透镜于光轴处的曲率半径。
表6a
Figure PCTCN2020096368-appb-000011
Figure PCTCN2020096368-appb-000012
其中，f为光学系统的焦距，FNO为光学系统的光圈数，FOV为光学系统的最大视场角，TTL为第一透镜的物侧面至光学系统的成像面于光轴上的距离。
表6b给出了可用于第六实施例中各非球面镜面S1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13、S14、S15、S16的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20，其中，各非球面面型可由第一实施例中给出的公式限定。
表6b
面序号 K A4 A6 A8 A10
S1 -1.9537 0.0487 -0.0032 0.0141 -0.0218
S2 0.0000 0.0499 -0.0506 0.1561 -0.3987
S3 -39.9717 -0.0295 -0.0398 0.4267 -1.2928
S4 -47.9825 -0.1511 0.5649 -0.5483 -1.8004
S5 -49.5604 -0.1619 0.8482 -1.7514 0.6791
S6 -4.7198 -0.0260 0.3810 -1.5279 3.2765
S7 86.9060 0.1459 0.0490 -0.2511 -0.1269
S8 -50.6464 0.2845 -0.1205 -0.6011 4.2979
S9 89.0000 0.0355 -0.2071 -0.3858 4.8861
S10 -78.4730 -0.0490 -0.0672 0.0341 0.6997
S11 -4.0835 -0.0609 0.0968 -0.1831 0.1080
S12 0.0000 0.0117 0.0166 -0.0433 -0.0276
S13 -97.2383 0.0862 -0.2040 0.1387 -0.0116
S14 0.0000 0.1368 -0.2317 0.1599 -0.0712
S15 -42.9930 -0.0123 0.0025 -0.0004 -0.0223
S16 -42.9930 -0.0398 -0.0086 0.0140 -0.0114
面序号 A12 A14 A16 A18 A20
S1 0.0235 -0.0151 0.0053 -0.0007 -0.0001
S2 0.5740 -0.4447 0.1770 -0.0307 0.0011
S3 2.0723 -1.8690 0.9501 -0.2540 0.0280
S4 6.1405 -8.2035 5.8098 -2.1583 0.3329
S5 3.2237 -6.3050 5.2871 -2.2061 0.3731
S6 -4.8159 4.9339 -3.1403 1.0702 -0.1249
S7 1.6528 -4.8041 6.2621 -3.7203 0.8280
S8 -11.8262 18.5911 -18.0715 10.0412 -2.4174
S9 -15.1964 26.9145 -28.0912 15.7783 -3.6697
S10 -2.0858 3.2199 -2.8883 1.4496 -0.3185
S11 -0.0190 -0.0082 0.0056 -0.0012 0.0001
S12 0.0752 -0.0547 0.0197 -0.0036 0.0003
S13 -0.0354 0.0221 -0.0062 0.0009 -0.0001
S14 0.0251 -0.0072 0.0015 -0.0002 0.0000
S15 0.0260 -0.0128 0.0032 -0.0004 0.0000
S16 0.0064 -0.0022 0.0004 -0.0001 0.0000
图12示出了第六实施例的光学系统的纵向球差曲线、像散曲线、畸变曲线。其中，纵向球差曲线表示不同波长的光线经由光学系统的各透镜后的会聚焦点偏离；像散曲线表示子午像面弯曲和弧矢像面弯曲，其中，S表示弧矢方向，T表示子午方向；畸变曲线表示不同视场角对应的畸变大小值。根据图12可知，第六实施例所给出的光学系统能够实现良好的成像品质。
实施例七
如图13所示，直线11表示光轴，第一个透镜L1远离第二透镜L2的一侧为物侧12，第六透镜L6远离第五透镜L5的一侧为像侧13。本实施例提供的光学系统中，从物侧12到像侧13依次为光阑STO、第一个透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7、第八透镜L8、红外滤光元件IRCF。
第一透镜L1具有正屈折力，且为塑料材质，其物侧面S1于光轴处为凸面，其物侧面S1于圆周处为凹面，其像侧面S2于光轴处和于圆周处为凸面，并皆为非球面。
第二透镜L2具有负屈折力，且为塑料材质，其物侧面S3于光轴处和于圆周处为凸面，其像侧面S4于光轴处和于圆周处为凹面，并皆为非球面。
第三透镜L3具有负屈折力，且为塑料材质，其物侧面S5于光轴处和于圆周处为凸面，其像侧面S6于光轴处和于圆周处为凹面，并皆为非球面。
第四透镜L4具有负屈折力，且为塑料材质，其物侧面S7于光轴处为凹面，其物侧面S7于圆周处为凸面，其像侧面S8于光轴处和于圆周处为凸面，且皆为非球面。
第五透镜L5具有正屈折力，且为塑料材质，其物侧面S9于光轴处为凸面，其物侧面S9于圆周处为凹面，其像侧面S10于光轴处和于圆周处为凹面，并皆为非球面。
第六透镜L6具有负屈折力，且为塑料材质，其物侧面S11于光轴处为凹面，其物侧面S11于圆周处为凸面，其像侧面S12于光轴处为凹面，其像侧面S12于圆周处为凸面，并皆为非球面。
第七透镜L7具有正屈折力，且为塑料材质，其物侧面S13于光轴处为凸面，其物侧面S13于圆周处为凹面，其像侧面S14于光轴处和于圆周处为凹面，并皆为非球面。
第八透镜L8具有负屈折力，且为塑料材质，其物侧面S15于光轴处为凸面，其物侧面S15于圆周处为凹面，其像侧面S16于光轴处为凹面，其像侧面S16于圆周处为凸面，并皆为非球面。
光阑STO可以位于光学系统物面与第八透镜之间，本实施例中的光阑STO设置在第一透镜L1的物侧面，可以用于控制进光量。
红外滤光元件IRCF设置在第八透镜L8之后，包括物侧面S17和像侧面S18，红外滤光元件IRCF用于过滤掉红外光线，使得射入成像面的光线为可见光，可见光的波长为380nm-780nm，红外滤光元件IRCF的材质为玻璃。
成像面S19为被摄物体的光通过光学系统后形成的像所在的面。
表7a示出了本实施例的光学系统的特性表格，其中，本实施例中的曲率半径是各透镜于光轴处的曲率半径。
表7a
Figure PCTCN2020096368-appb-000013
其中，f为光学系统的焦距，FNO为光学系统的光圈数，FOV为光学系统的最大视场角， TTL为第一透镜的物侧面至光学系统的成像面于光轴上的距离。
表7b给出了可用于第七实施例中各非球面镜面S1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13、S14、S15、S16的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20，其中，各非球面面型可由第一实施例中给出的公式限定。
表7b
面序号 K A4 A6 A8 A10
S1 -2.0125 0.0513 0.0008 -0.0075 0.0321
S2 -71.8670 0.0697 0.0163 -0.3678 0.9755
S3 -55.0621 -0.0717 0.3022 -0.9967 2.0556
S4 -54.1554 -0.1833 0.9395 -2.8979 5.6689
S5 -42.0631 -0.1403 0.9417 -3.3125 6.9449
S6 -5.7651 0.0055 0.1038 -0.5820 0.2032
S7 99.0000 0.2804 -0.5686 1.0937 -3.2312
S8 0.0000 0.4502 -1.1150 2.0985 -2.4549
S9 91.5668 0.1122 -0.9963 3.3433 -7.9586
S10 -51.7592 -0.0554 -0.2029 1.3311 -4.6694
S11 -10.9160 -0.0276 -0.2340 0.4745 -0.7044
S12 -21.5543 0.0758 -0.1765 0.1365 -0.0582
S13 -99.0000 0.0280 0.0360 -0.1992 0.2477
S14 -42.9930 -0.0492 0.0570 -0.0322 -0.0328
S15 -42.9930 -0.0687 -0.0011 0.0593 -0.0839
S16 0.0000 -0.0829 0.0125 -0.0011 0.0038
面序号 A12 A14 A16 A18 A20
S1 -0.0544 0.0535 -0.0310 0.0099 -0.0014
S2 -1.3415 1.1036 -0.5500 0.1530 -0.0182
S3 -2.5523 1.9375 -0.8793 0.2177 -0.0222
S4 -6.7788 4.5218 -1.2525 -0.1431 0.1119
S5 -8.8342 6.2470 -1.7522 -0.3202 0.2144
S6 4.1754 -12.4198 16.4065 -10.6253 2.7515
S7 9.8442 -20.6121 24.5687 -15.0518 3.7124
S8 4.0690 -7.6009 7.8327 -3.8344 0.7048
S9 15.9144 -20.2807 13.8754 -4.2596 0.3090
S10 11.1007 -16.5021 14.7391 -7.1234 1.4088
S11 0.7144 -0.4793 0.2045 -0.0485 0.0046
S12 0.0171 -0.0066 0.0028 -0.0007 0.0001
S13 -0.1565 0.0572 -0.0122 0.0014 -0.0001
S14 0.0479 -0.0241 0.0061 -0.0008 0.0000
S15 0.0595 -0.0238 0.0054 -0.0007 0.0000
S16 -0.0023 0.0005 0.0000 0.0000 0.0000
图14示出了第七实施例的光学系统的纵向球差曲线、像散曲线、畸变曲线。其中，纵向球差曲线表示不同波长的光线经由光学系统的各透镜后的会聚焦点偏离；像散曲线表示子午像面弯曲和弧矢像面弯曲，其中，S表示弧矢方向，T表示子午方向；畸变曲线表示不同视场角对应的畸变大小值。根据图14可知，第七实施例所给出的光学系统能够实现良好的成像品质。
实施例八
如图15所示，直线11表示光轴，第一个透镜L1远离第二透镜L2的一侧为物侧12，第六透镜L6远离第五透镜L5的一侧为像侧13。本实施例提供的光学系统中，从物侧12到像侧13依次为光阑STO、第一个透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7、第八透镜L8、红外滤光元件IRCF。
第一透镜L1具有正屈折力，且为塑料材质，其物侧面S1于光轴处为凸面，其物侧面S1于圆周处为凹面，其像侧面S2于光轴处和于圆周处为凸面，并皆为非球面。
第二透镜L2具有正屈折力，且为塑料材质，其物侧面S3于光轴处和于圆周处为凸面，其像侧面S4于光轴处为凸面，其像侧面S4于圆周处为凹面，并皆为非球面。
第三透镜L3具有负屈折力，且为塑料材质，其物侧面S5于光轴处和于圆周处为凹面，其像侧面S6于光轴处和于圆周处为凹面，并皆为非球面。
第四透镜L4具有正屈折力，且为塑料材质，其物侧面S7于光轴处为凸面，其物侧面S7于圆周处为凹面，其像侧面S8于光轴处和于圆周处为凸面，且皆为非球面。
第五透镜L5具有负屈折力，且为塑料材质，其物侧面S9于光轴处为凸面，其物侧面S9于圆周处为凹面，其像侧面S10于光轴处和于圆周处为凹面，并皆为非球面。
第六透镜L6具有负屈折力，且为塑料材质，其物侧面S11于光轴处为凹面，其物侧面S11于圆周处为凸面，其像侧面S12于光轴处和于圆周处为凸面，并皆为非球面。
第七透镜L7具有负屈折力，且为塑料材质，其物侧面S13于光轴处和于圆周处为凸面，其像侧面S14于光轴处和于圆周处为凹面，并皆为非球面。
第八透镜L8具有负屈折力，且为塑料材质，其物侧面S15于光轴处为凹面，其物侧面S15于圆周处为凸面，其像侧面S16于光轴处为凸面，其像侧面S16于圆周处为凹面，并皆为非球面。
光阑STO可以位于光学系统物面与第八透镜之间，本实施例中的光阑STO设置在第一透镜L1的物侧面，可以用于控制进光量。
红外滤光元件IRCF设置在第八透镜L8之后，包括物侧面S17和像侧面S18，红外滤光元件IRCF用于过滤掉红外光线，使得射入成像面的光线为可见光，可见光的波长为380nm-780nm，红外滤光元件IRCF的材质为玻璃。
成像面S19为被摄物体的光通过光学系统后形成的像所在的面。
表8a示出了本实施例的光学系统的特性表格，其中，本实施例中的曲率半径是各透镜于光轴处的曲率半径。
表8a
Figure PCTCN2020096368-appb-000014
其中，f为光学系统的焦距，FNO为光学系统的光圈数，FOV为光学系统的最大视场角，TTL为第一透镜的物侧面至光学系统的成像面于光轴上的距离。
表8b给出了可用于第八实施例中各非球面镜面S1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13、S14、S15、S16的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20，其中，各非球面面型可由第一实施例中给出的公式限定。
表8b
面序号 K A4 A6 A8 A10
S1 -1.9598 0.0490 0.0008 -0.0056 0.0285
S2 0.0000 0.0458 -0.0173 0.0302 -0.1152
S3 -49.6866 -0.0330 0.0136 0.1699 -0.6833
S4 -57.0050 -0.1849 0.9705 -2.6363 3.9094
S5 -57.0050 -0.2023 1.3246 -4.3385 8.2137
S6 -4.8729 -0.0313 0.4411 -2.0219 4.8284
S7 86.9060 0.1621 -0.0567 0.2286 -2.1164
S8 -49.7195 0.3297 -0.4951 1.1111 -1.1350
S9 89.0000 0.0721 -0.5393 1.0971 0.6424
S10 -78.4730 -0.0582 -0.0529 0.0593 0.5863
S11 -10.9160 -0.0588 0.0776 -0.1700 0.1468
S12 -35.5530 0.0017 0.1125 -0.2868 0.2929
S13 0.0000 0.0729 -0.1379 0.0370 0.0709
S14 -42.9930 0.1424 -0.3037 0.2888 -0.1870
S15 -26.3451 0.0424 -0.1011 0.0816 -0.0504
S16 0.0000 -0.0454 -0.0175 0.0210 -0.0139
面序号 A12 A14 A16 A18 A20
S1 -0.0504 0.0503 -0.0291 0.0092 -0.0013
S2 0.2084 -0.1851 0.0839 -0.0184 0.0015
S3 1.2850 -1.3247 0.7743 -0.2430 0.0323
S4 -2.8932 0.3720 0.9859 -0.6770 0.1420
S5 -9.5260 6.7535 -2.7366 0.5223 -0.0219
S6 -6.9851 5.8839 -2.1462 -0.2782 0.3365
S7 6.9561 -13.2247 14.1647 -7.8153 1.7349
S8 -0.3130 2.9986 -5.1346 4.0317 -1.2165
S9 -7.0954 16.8312 -20.2904 12.3777 -3.0301
S10 -1.9332 3.1732 -3.0005 1.5845 -0.3642
S11 -0.0948 0.0593 -0.0290 0.0084 -0.0010
S12 -0.1676 0.0568 -0.0111 0.0011 0.0000
S13 -0.0741 0.0328 -0.0078 0.0010 -0.0001
S14 0.0862 -0.0270 0.0054 -0.0006 0.0000
S15 0.0255 -0.0092 0.0021 -0.0003 0.0000
S16 0.0079 -0.0031 0.0007 -0.0001 0.0000
图16示出了第八实施例的光学系统的纵向球差曲线、像散曲线、畸变曲线。其中，纵向球差曲线表示不同波长的光线经由光学系统的各透镜后的会聚焦点偏离；像散曲线表示子午像面弯曲和弧矢像面弯曲，其中，S表示弧矢方向，T表示子午方向；畸变曲线表示不同视场角对应的畸变大小值。根据图16可知，第八实施例所给出的光学系统能够实现良好的成像品质。
实施例九
如图17所示，直线11表示光轴，第一个透镜L1远离第二透镜L2的一侧为物侧12，第六透镜L6远离第五透镜L5的一侧为像侧13。本实施例提供的光学系统中，从物侧12到像侧13依次为光阑STO、第一个透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7、第八透镜L8、红外滤光元件IRCF。
第一透镜L1具有正屈折力，且为塑料材质，其物侧面S1于光轴处为凸面，其物侧面S1于圆周处为凹面，其像侧面S2于光轴处和于圆周处为凸面，并皆为非球面。
第二透镜L2具有正屈折力，且为塑料材质，其物侧面S3于光轴处和于圆周处为凸面，其像侧面S4于光轴处和于圆周处为凹面，并皆为非球面。
第三透镜L3具有负屈折力，且为塑料材质，其物侧面S5于光轴处为凸面，其物侧面S5于圆周处为凹面，其像侧面S6于光轴处和于圆周处为凹面，并皆为非球面。
第四透镜L4具有正屈折力，且为塑料材质，其物侧面S7于光轴处为凹面，其物侧面S7于圆周处为凸面，其像侧面S8于光轴处和于圆周处为凸面，且皆为非球面。
第五透镜L5具有负屈折力，且为塑料材质，其物侧面S9于光轴处和于圆周处为凹面，其像侧面S10于光轴处为凸面，其像侧面S10于圆周处为凹面，并皆为非球面。
第六透镜L6具有负屈折力，且为塑料材质，其物侧面S11于光轴处为凹面，其物侧面S11于圆周处为凸面，其像侧面S12于光轴处和于圆周处为凸面，并皆为非球面。
第七透镜L7具有负屈折力，且为塑料材质，其物侧面S13于光轴处为凹面，其物侧面S13于圆周处为凸面，其像侧面S14于光轴处和于圆周处为凹面，并皆为非球面。
第八透镜L8具有负屈折力，且为塑料材质，其物侧面S15于光轴处和于圆周处为凸面，其像侧面S16于光轴处和于圆周处为凹面，并皆为非球面。
光阑STO可以位于光学系统物面与第八透镜之间，本实施例中的光阑STO设置在第一透镜L1的物侧面，可以用于控制进光量。
红外滤光元件IRCF设置在第八透镜L8之后，包括物侧面S17和像侧面S18，红外滤光元件IRCF用于过滤掉红外光线，使得射入成像面的光线为可见光，可见光的波长为380nm-780nm，红外滤光元件IRCF的材质为玻璃。
成像面S19为被摄物体的光通过光学系统后形成的像所在的面。
表9a示出了本实施例的光学系统的特性表格，其中，本实施例中的曲率半径是各透镜于光轴处的曲率半径。
表9a
Figure PCTCN2020096368-appb-000015
Figure PCTCN2020096368-appb-000016
其中，f为光学系统的焦距，FNO为光学系统的光圈数，FOV为光学系统的最大视场角，TTL为第一透镜的物侧面至光学系统的成像面于光轴上的距离。
表9b给出了可用于第九实施例中各非球面镜面S1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13、S14、S15、S16的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20，其中，各非球面面型可由第一实施例中给出的公式限定。
表9b
面序号 K A4 A6 A8 A10
S1 -1.9710 0.0491 -0.0009 0.0017 0.0134
S2 -27.4493 0.0293 0.1348 -0.4859 0.8656
S3 -55.3940 -0.0625 0.2487 -0.5924 0.7324
S4 0.0000 -0.1905 0.9008 -2.0154 2.0426
S5 -45.7523 -0.1867 1.0068 -2.5953 3.4743
S6 -5.3640 -0.0232 0.1831 -0.6555 0.9273
S7 99.0000 0.2022 -0.3784 1.4538 -5.1866
S8 -14.8708 0.3050 -0.4822 1.3654 -2.6730
S9 89.0000 0.0349 -0.3336 0.8614 -0.1520
S10 -78.4730 -0.0807 -0.0173 0.1571 -0.0802
S11 -10.4220 -0.0119 -0.0943 0.1489 -0.2101
S12 -35.5530 0.0633 -0.0710 0.0339 -0.0379
S13 -80.1188 0.0407 -0.0362 -0.0848 0.1498
S14 -42.9930 0.0811 -0.1459 0.1133 -0.0797
S15 -42.9930 0.0189 -0.0783 0.1089 -0.0984
S16 -36.1579 -0.0713 0.0082 0.0173 -0.0155
面序号 A12 A14 A16 A18 A20
S1 -0.0321 0.0371 -0.0237 0.0081 -0.0012
S2 -0.9674 0.7279 -0.3615 0.1052 -0.0133
S3 -0.4005 -0.0022 0.1095 -0.0492 0.0075
S4 0.0935 -2.4577 2.5759 -1.1656 0.2049
S5 -1.8958 -0.9292 2.0409 -1.1592 0.2341
S6 0.0127 -2.1621 3.5589 -2.5223 0.7111
S7 12.0972 -18.5544 17.2251 -8.5724 1.7489
S8 3.6308 -2.8105 0.1677 1.2066 -0.5482
S9 -3.3751 9.5954 -12.3798 7.7215 -1.8895
S10 -0.2453 0.7692 -0.9576 0.6058 -0.1589
S11 0.1697 -0.0667 0.0075 0.0025 -0.0006
S12 0.0430 -0.0270 0.0093 -0.0017 0.0001
S13 -0.1054 0.0404 -0.0088 0.0010 -0.0001
S14 0.0455 -0.0170 0.0037 -0.0004 0.0000
S15 0.0521 -0.0163 0.0030 -0.0003 0.0000
S16 0.0059 -0.0012 0.0001 0.0000 0.0000
图18示出了第九实施例的光学系统的纵向球差曲线、像散曲线、畸变曲线。其中，纵向球差曲线表示不同波长的光线经由光学系统的各透镜后的会聚焦点偏离；像散曲线表示子午像面弯曲和弧矢像面弯曲，其中，S表示弧矢方向，T表示子午方向；畸变曲线表示不同视场角对应的畸变大小值。根据图18可知，第九实施例所给出的光学系统能够实现良好的成像品质。
表10为第一实施例至第九实施例的光学系统的TTL/Imgh、TTL/f、f1/f28、FNO、(L81-L82)/2*L83、TTL/ct56、Imgh/tan(HFOV)的值。
表10
Figure PCTCN2020096368-appb-000017
Figure PCTCN2020096368-appb-000018
由表10可见，各实施例均能满足：TTL/Imgh<2.5，TTL/f<1.1，-1.8<f1/f28<-0.5，FNO<2.4，(L81-L82)/2*L83＞0.7，TTL/ct56>4，Imgh/tan(HFOV)>5mm。
参阅图19，本申请涉及的光学系统应用在终端设备30中的镜头模组20。终端设备30可以为手机、平板电脑、无人机、计算机等设备。镜头模组20的感光元件位于光学系统的像侧，镜头模组20组装在终端设备30内部。
本申请提供一种镜头模组，包括感光元件和本申请提供的光学系统，感光元件位于光学系统的像侧，用于将穿过第一透镜至第八透镜且入射到电子感光元件上的光线转换成图像的电信号。电子感光元件可以为互补金属氧化物半导体(Complementary Metal Oxide Semiconductor，CMOS)或电荷耦合器件(Charge-coupled Device，CCD)。通过在镜头模组内安装该光学系统，使镜头模组在满足微型设计的同时，具有长焦距的特性，并具有良好的成像质量，使拍摄的画面具有高画质感、高分辨率和高清晰度。
本申请还提供一种终端设备，该终端设备包括本申请提供的镜头模组。该终端设备可以为手机、平板电脑、无人机、计算机等。通过在终端设备内安装该镜头模组，使终端设备在满足微型设计的同时，具有长焦距的特性，并具有良好的成像质量，使拍摄的画面具有高画质感、高分辨率和高清晰度。
以上所述是本申请的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本申请的保护范围。

Claims (10)

  1. 一种光学系统，其特征在于，包括多个透镜，所述多个透镜包括从物侧至像侧依次排布的第一透镜、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，其中，所述第一透镜具有正屈折力，所述第三透镜具有负屈折力，其余所述透镜具有屈折力；所述第一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，所述第四透镜的像侧面于光轴处为凸面；
    所述光学系统满足以下条件式：
    TTL/f<1.1，
    TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，f为所述光学系统的焦距。
  2. 根据权利要求1所述的光学系统，其特征在于，所有的所述透镜的物侧面和像侧面均为非球面。
  3. 根据权利要求1或2所述的光学系统，其特征在于，所述光学系统满足条件式：
    -1.8<f1/f28<-0.5，
    f1为所述第一透镜的焦距，f28为所述第二透镜至所述第八透镜的组合焦距。
  4. 根据权利要求1或2所述的光学系统，其特征在于，所述光学系统满足条件式：
    TTL/ct56>4，
    TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，ct56为所述第五透镜的物侧面至所述第六透镜的像侧面于光轴上的距离。
  5. 根据权利要求1或2所述的光学系统，其特征在于，所述光学系统满足条件式：
    (L81-L82)/2*L83＞0.7，
    一束光线入射至所述光学系统的成像面的离光轴的最远点，所述光线与所述第八透镜的像侧面有第一交点，L81为所述第一交点至所述第一交点于光轴上的垂直投影点的最大距离，L82为所述第一交点至所述第一交点于光轴上的垂直投影点的最小距离，一束光线入射至所述光学系统的成像面的中心点，所述光线与所述第八透镜的像侧面有第二交点，L83为所述第二交点至所述第二交点于光轴上的垂直投影点的最大距离。
  6. 根据权利要求1或2所述的光学系统，其特征在于，所述光学系统满足条件式：
    TTL/Imgh<2.5，
    TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，Imgh为所述光学系统最大视场角的一半所对应的像高。
  7. 根据权利要求1或2所述的光学系统，其特征在于，所述光学系统满足条件式：
    FNO<2.4，
    FNO为所述光学系统的光圈数。
  8. 根据权利要求1或2所述的光学系统，其特征在于，所述光学系统满足条件式：
    Imgh/tan(HFOV)>5mm，
    Imgh为所述光学系统最大视场角的一半所对应的像高，tan(HFOV)为所述光学系统的最大视场角一半的正切值。
  9. 一种镜头模组，其特征在于，包括感光元件和如权利要求1至8任一项所述的光学系统，所述感光元件位于所述光学系统的像侧。
  10. 一种终端设备，其特征在于，包括如权利要求9所述的镜头模组。
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