WO2022183508A1 - 摄像光学系统、以及光学摄像装置 - Google Patents

摄像光学系统、以及光学摄像装置 Download PDF

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Publication number
WO2022183508A1
WO2022183508A1 PCT/CN2021/079394 CN2021079394W WO2022183508A1 WO 2022183508 A1 WO2022183508 A1 WO 2022183508A1 CN 2021079394 W CN2021079394 W CN 2021079394W WO 2022183508 A1 WO2022183508 A1 WO 2022183508A1
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Prior art keywords
lens
image
optical axis
satisfies
optical system
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PCT/CN2021/079394
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English (en)
French (fr)
Inventor
有田信一
侯鍁錩
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北京小米移动软件有限公司
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Application filed by 北京小米移动软件有限公司 filed Critical 北京小米移动软件有限公司
Priority to JP2021523201A priority Critical patent/JP7335955B2/ja
Priority to CN202180000891.9A priority patent/CN115552308A/zh
Priority to EP21927047.7A priority patent/EP4109164A4/en
Priority to PCT/CN2021/079394 priority patent/WO2022183508A1/zh
Priority to US17/897,044 priority patent/US20220413266A1/en
Publication of WO2022183508A1 publication Critical patent/WO2022183508A1/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
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components

Definitions

  • the present disclosure relates to an imaging optical system including a plurality of lenses, and an optical imaging device including the imaging optical system.
  • an image capturing apparatus mounted on a mobile terminal has generally been equipped with three or more image capturing apparatuses in recent years.
  • a camera lens (imaging optical system) having a normal zoom mechanism is a single lens mounted with an optical zoom lens that satisfies all angles of view from wide-angle to telephoto.
  • zoom magnification the ratio of the focal lengths from the widest wide-angle end to the farthest telephoto end is called zoom magnification, and the zoom magnification is an important parameter of the zoom lens.
  • a plurality of image capturing devices having single focus lenses (optical systems) having different focal lengths for example, an image capturing device dedicated to a super wide angle, an image capturing device dedicated to a standard angle of view, A telephoto camera device), which electronically achieves the same zoom effect as an optical zoom lens by combining the output images output from each camera device.
  • a lens with a field of view (hereinafter referred to as "FOV") of about 120° is mounted as a lens exclusively for wide angle, and various companies have proposed various proposals for this lens exclusively for wide angle.
  • FOV field of view
  • Patent Document 1 Patent Documents 2 CNA-107577031, and CNA-107305274, a surveillance camera and an ultra-wide-angle lens with an FOV of 130° or more for close-up action are proposed.
  • Patent Document 3 and Patent Document 4 a wide-angle lens having a size that can be mounted on a mobile terminal and a viewing angle of about 120° is proposed.
  • These are optical systems called so-called telephoto types, which are commonly used in mobile terminals.
  • This telephoto type wide-angle lens can reduce the overall length by reducing aberrations by using a large number of aspherical lenses and at the same time shortening the back focal length, thereby ensuring sufficient imaging performance.
  • this optical system when the angle of view is further widened, it is not a type that uses pupil magnification to compensate for the reduction in the amount of ambient light caused by the Cos4 power law, as in the inverse telephoto optical system.
  • the lenses of the present proposal among the lenses of L1, L4, L5, and L6, since the shapes of the end portions farther from the optical axis need to be greatly changed compared with those in the vicinity of the center, the forming of the lenses is difficult. This results in not only a decrease in productivity but also difficulty in securing the imaging performance itself.
  • Patent Document 1 Published Patent Publication CN107577031A
  • Patent Document 2 Published Patent Publication CN107305274A
  • Patent Document 3 Published Patent Publication CN108732716A
  • Patent Document 4 Published Patent Publication CN107957621A
  • an object of the present disclosure is to provide an imaging optical system capable of obtaining a large angle of view while maintaining sufficient imaging performance despite being small, and an optical imaging device including the imaging optical system.
  • the imaging optical system of the present disclosure includes:
  • the first lens has negative power, and its image-side surface is concave;
  • the second lens has negative power, and its image-side surface is concave;
  • the third lens has a positive refractive power, and its image-side surface is concave;
  • the fourth lens has positive refractive power, and its image-side surface is convex;
  • the fifth lens has a positive refractive power, the object-side surface is concave, and the image-side surface is convex;
  • the sixth lens has negative power, the object-side surface is concave, and the image-side surface is convex;
  • a seventh lens whose object-side surface is an aspherical surface whose center portion is convex and has at least one point of inflection on a peripheral portion of the center portion, and whose image-side surface is convex;
  • the object-side surface is a concave surface
  • the image-side surface is an aspheric surface whose center portion is concave and has at least one inflection point on the peripheral portion of the center portion;
  • the focal length of the first lens is f1
  • the focal length of the second lens is f2
  • the combined focal length of the first lens and the second lens is f12
  • the focal length of the third lens is f3, from the third lens
  • the distance along the optical axis from the image-side surface of the lens to the object-side surface of the fourth lens is set as T34
  • the distance along the optical axis from the image-side surface of the sixth lens to the object-side surface of the seventh lens When the distance of the axis is set to T67, it satisfies:
  • the imaging optical system has an aperture stop, and the aperture stop is arranged between the third lens and the fourth lens;
  • the distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens be T12, and set the distance from the image-side surface of the second lens to the object-side surface of the third lens as T12
  • T23 the distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens
  • the maximum effective radius of the object-side surface of the first lens is Y11
  • the maximum effective radius of the image-side surface of the eighth lens is Y82
  • the focal length of the imaging optical system is set to f
  • the focal length of the fourth lens is set to f4
  • the focal length of the fifth lens is set to f5
  • the distance along the optical axis from the image side surface of the sixth lens to the object side surface of the seventh lens be T67, and let the thickness of the seventh lens along the optical axis be CT7,
  • the distance along the optical axis from the image-side surface of the lens to the object-side surface of the eighth lens is set as T78, and the thickness along the optical axis of the eighth lens is set as CT8, it can satisfy:
  • the radius of curvature of the object-side surface of the seventh lens be R13
  • the curvature radius of the image-side surface of the seventh lens be R14
  • the curvature radius of the object-side surface of the eighth lens be R15
  • the The radius of curvature of the image-side surface of the eighth lens is R16
  • the thickness along the optical axis of the seventh lens is CT7
  • the image-side surface of the seventh lens goes to the object-side surface of the eighth lens.
  • the distance along the optical axis is set as T78
  • the thickness along the optical axis of the eighth lens is set as CT8
  • the distance along the optical axis from the object side surface of the first lens to the imaging surface is set as TL
  • the focal length of the entire imaging optical system is set to f, it can satisfy:
  • the amount of displacement in the optical axis direction from the intersection with the optical axis in the surface of the first lens on the object side to the maximum effective radius position of the surface on the object side is set to Sag11, and the amount of displacement in the direction of the optical axis from the object side of the third lens
  • the displacement amount in the optical axis direction from the intersection with the optical axis in the side surface to the maximum effective radius position of the object side surface is set to Sag31, it can satisfy:
  • the distortion aberration amount of the maximum image height is set to DST1.0
  • the distortion aberration amount of the 70% image height of the maximum image height is set to DST0.7
  • the maximum field angle is set to FOV, it can satisfy:
  • the imaging optical system of the present disclosure includes:
  • the first lens has a negative refractive power
  • the image-side surface of the second lens is concave
  • the image-side face of the third lens is concave
  • the image-side surface of the fourth lens is convex
  • the fifth lens has positive refractive power, and its image-side surface is convex;
  • the sixth lens has negative power, the object-side surface is concave, and the image-side surface is convex;
  • the seventh lens has a positive refractive power, and its object-side surface is an aspherical surface having a convex center portion and having at least one inflection point on a peripheral portion of the center portion;
  • an eighth lens whose image-side surface is an aspherical surface having a concave center portion and at least one inflection point on a peripheral portion of the center portion;
  • the focal length of the first lens is f1
  • the focal length of the second lens is f2
  • the combined focal length of the first lens and the second lens is f12
  • the focal length of the third lens is f3
  • the first to The focal length of the entire optical system constituted by the eighth lens is f
  • the thickness along the optical axis of the seventh lens is CT7
  • the edge from the image-side surface of the seventh lens to the object-side surface of the eighth lens is When the distance to the optical axis is set to T78, and the thickness of the eighth lens along the optical axis is set to CT8, it satisfies:
  • the image-side face of the first lens is concave
  • the radius of curvature of the surface of the seventh lens on the object side be R13
  • the radius of curvature of the surface of the seventh lens on the image side be R14
  • the radius of curvature of the surface of the eighth lens on the object side be R15
  • the radius of curvature of the image-side surface of the eighth lens be R16
  • the thickness along the optical axis of the seventh lens be CT7, from the image-side surface of the seventh lens to the object-side surface of the eighth lens.
  • the imaging optical system has an aperture stop
  • the distance along the optical axis from the aperture stop to the image-side surface of the eighth lens be SD, and the distance from the object-side surface of the first lens to the image-side surface of the eighth lens along the optical axis
  • the maximum effective radius of the object-side surface of the first lens is set as Y11
  • the maximum effective radius of the image-side surface of the eighth lens is set as Y82
  • the distortion aberration amount of the maximum image height is set to DST1.0
  • the distortion aberration amount of the 70% image height of the maximum image height is set to DST0.7
  • the maximum field angle is set to FOV, it can satisfy:
  • the imaging optical system of the present disclosure includes:
  • the first lens has a negative refractive power
  • the image-side surface of the second lens is concave
  • the object-side surface of the third lens is convex
  • the object-side surface of the fourth lens is convex
  • the fifth lens has a positive refractive power
  • the sixth lens has negative power, the object-side surface is concave, and the image-side surface is convex;
  • the seventh lens has positive refractive power, and its image-side surface is convex;
  • an eighth lens whose image-side surface is an aspherical surface having a concave center portion and at least one inflection point on a peripheral portion of the center portion;
  • the thickness of the first lens along the optical axis is set as CT1
  • the thickness of the eighth lens along the optical axis is set as CT8, it satisfies:
  • the amount of displacement in the optical axis direction from the intersection with the optical axis in the surface of the first lens on the object side to the maximum effective radius position of the surface on the object side is set to Sag11, and the amount of displacement in the direction of the optical axis from the object side of the third lens
  • the displacement amount in the optical axis direction from the intersection with the optical axis in the side surface to the maximum effective radius position of the object side surface is set to Sag31, it can satisfy:
  • the distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens be T12, and set the distance from the image-side surface of the second lens to the object-side surface of the third lens as T12
  • the distance along the optical axis is set as T23
  • the distance along the optical axis from the image side surface of the third lens to the object side surface of the fourth lens is set as T34
  • the distance from the image side of the fourth lens is set as T34.
  • the distance along the optical axis from the surface to the object-side surface of the fifth lens is set as T45
  • the distance along the optical axis from the image-side surface of the fifth lens to the object-side surface of the sixth lens is set as T56
  • the distance along the optical axis from the image-side surface of the sixth lens to the object-side surface of the seventh lens is set as T67
  • the distance from the image-side surface of the seventh lens to the object-side surface of the eighth lens is set as T67.
  • optical imaging device of the present disclosure includes:
  • a drive unit that drives all or part of the first to eighth lenses included in the imaging optical system
  • the photoelectric conversion element is arranged on the imaging surface of the imaging optical system.
  • FIG. 1 is a schematic diagram showing the configuration of the optical imaging device of the present embodiment.
  • FIG. 2 is a schematic diagram of the parameter Y11 of the first lens included in the optical system included in the optical imaging device.
  • FIG. 3 is a diagram for explaining the parameter Y82 of the eighth lens included in the optical system.
  • FIG. 4 is a diagram for explaining the parameter Sag11 of the first lens included in the optical system.
  • FIG. 5 is a diagram for explaining the parameter Sag31 of the third lens included in the optical system.
  • FIG. 6 is a diagram for explaining the parameter Yc82 of the eighth lens included in the optical system.
  • FIG. 7 is a schematic diagram showing the configuration of the optical imaging device of Embodiment 1.
  • FIG. 7 is a schematic diagram showing the configuration of the optical imaging device of Embodiment 1.
  • FIG. 8 is an aberration diagram of spherical aberration, astigmatism, and distortion in Example 1.
  • FIG. 8 is an aberration diagram of spherical aberration, astigmatism, and distortion in Example 1.
  • FIG. 9 is a schematic diagram showing the configuration of the optical imaging device of Example 2.
  • FIG. 10 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 2.
  • FIG. 10 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 2.
  • FIG. 11 is a schematic diagram showing the configuration of the optical imaging device of Example 3.
  • FIG. 11 is a schematic diagram showing the configuration of the optical imaging device of Example 3.
  • FIG. 12 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 3.
  • FIG. 12 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 3.
  • FIG. 13 is a schematic diagram showing the configuration of the optical imaging device of Example 4.
  • FIG. 14 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 4.
  • FIG. 14 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 4.
  • FIG. 15 is a schematic diagram showing the configuration of the optical imaging device of Example 5.
  • FIG. 16 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 5.
  • FIG. 16 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 5.
  • FIG. 17 is a schematic diagram showing the structure of the optical imaging device of Example 6.
  • FIG. 18 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 6.
  • FIG. 18 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 6.
  • FIG. 19 is a schematic diagram showing the configuration of the optical imaging device of Example 7.
  • FIG. 19 is a schematic diagram showing the configuration of the optical imaging device of Example 7.
  • FIG. 20 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 7.
  • FIG. 20 is an aberration diagram of spherical aberration, astigmatism, and distortion of Example 7.
  • An optical imaging device 1 (hereinafter simply referred to as an “imaging device”) according to the present embodiment includes an imaging optical system (hereinafter simply referred to as an “optical system”) 10 and an imaging device arranged in the optical system 10 as shown in FIG. 1 .
  • the photoelectric conversion element 2 on the surface 10a.
  • the imaging device 1 includes: an optical system 10 having a plurality of lenses 11 to 18 ; a sensor holder 3 that holds the photoelectric conversion element 2 ; and a drive unit 4 that drives the optical system 10 .
  • the imaging device 1 of the present embodiment further includes an IR cut filter F, which is arranged between the optical system 10 and the photoelectric conversion element 2 .
  • the sensor holder 3 holds the photoelectric conversion element 2 so that the photoelectric conversion element 2 is located on the imaging surface 10 a of the optical system 10 . Specifically, the sensor holder 3 holds the photoelectric conversion element 2 such that the light-receiving surface of the photoelectric conversion element 2 is orthogonal to the optical axis of the optical system 10 .
  • the photoelectric conversion element 2 converts an image composed of incident visible light into an electrical signal, and transmits (outputs) the image to an image processor or the like in a later stage (not shown).
  • the photoelectric conversion element 2 of the present embodiment is an image sensor such as a CMOS, and can be bonded and fixed to the sensor holder 3 after adjusting the posture of the sensor holder 3 or the optical system 10 with respect to the optical axis.
  • an IR cut filter F is also fixed to the sensor bracket 3 .
  • the IR cut filter F removes light in the infrared region, which is unnecessary for image formation, among the light rays passing through the optical system 10, and passes only light in the visible light region.
  • the IR cut filter F has the following transmittance characteristics: the transmittance of light of any wavelength in the wavelength range of 380 nm to 430 nm is 50% (half value), and the transmittance of light in the wavelength range of 500 nm to 600 nm is 50% (half value).
  • the transmittance is 80% or more, and the transmittance of light in the wavelength range of 730 nm to 800 nm is 10% or less.
  • the IR cut filter F is formed by adding a multi-layer coating which is a multi-layer structure in which TiO 2 films and SiO 2 films are alternately stacked on the surface of the infrared absorbing glass base. Since the surfaces on both sides of the IR cut filter F are substantially flat, even if it is disposed between the optical system 10 and the photoelectric conversion element 2 , it does not affect the imaging of light.
  • an infrared absorbing ink may be applied to a common transparent glass plate (D263Teco manufactured by SCHOTT, etc.), and an AR coating for antireflection may be applied from the upper part. Also with this IR cut filter, the same transmittance characteristics as the above-described IR cut filter F can be achieved.
  • the drive unit 4 is a driver such as a VCM (Voice Coil Motor), and drives the optical system 10 in a direction (optical axis direction) substantially perpendicular to the light receiving surface of the photoelectric conversion element 2 .
  • VCM Vehicle Coil Motor
  • the optical system 10 has: a lens group including a plurality of lenses; an aperture stop 5 arranged between the lenses; and a lens holding member (lens barrel) 6 holding the lens group.
  • the optical system 10 includes: a light-shielding member 7 disposed at an end portion on the object side (light incident side); at least one light-shielding sheet 8 disposed between the lenses; and a lens holding ring 9 held with respect to the lenses Part 6 pushes against the lens group.
  • the lens group includes a first lens 11 , a second lens 12 , a third lens 13 , a fourth lens 14 , a fifth lens 15 , a sixth lens 16 , and a seventh lens arranged in order in the direction from the object side to the image side 17 , and the eighth lens 18 .
  • the total number of lenses in the lens group of the present embodiment is eight, and the fourth to sixth lenses 14 to 16 constitute a main lens group that determines the imaging performance of the optical system 10 .
  • Each of these first to seventh lenses 11 to 17 has a laminated structure using a slope in the peripheral portion.
  • the lenses 11 to 17 can be precisely arranged at the arrangement positions by fitting the adjacent lenses to each other in the laminated structure. That is, the lens position accuracy can be obtained with high accuracy.
  • a light-shielding and spacer 8a is provided, which has a function of cutting unnecessary disturbing light, and is used to adjust the curvature of the field of view. In actual mass production, due to various tolerance errors, image quality deterioration due to deterioration in the amount of field curvature occurs.
  • the space between the seventh lens 17 and the eighth lens 18 in the optical axis direction can be adjusted by changing the thickness of the light-shielding and spacer 8a, and the generated field curvature can be eliminated.
  • the details of these first to eighth lenses 11 to 18 will be described later.
  • the lens holding member 6 is a cylindrical member that holds the first to eighth lenses 11 to 18 inside. Specifically, the lens holding member 6 holds the first lens 11 , the shading sheet 8 , the second lens 12 , the shading sheet 8 , the third lens 13 , the aperture stop 5 , and the fourth lens, which are arranged in this order from the object side to the image side. 14.
  • the lens holding member 6 of the present embodiment in a state in which the first to eighth lenses 11 to 18 , the plurality of light shielding sheets 8 , and the light shielding and spacer 8 a are inserted into the interior in the order described above, the lens holding ring 9. These members are restrained with an appropriate pressure and fixed to the lens holding member 6 with an adhesive such as UV curable resin.
  • the aperture stop 5 arranged between the third lens 13 and the fourth lens 14 has a role of determining the aperture value of the entire optical system 10 .
  • the light shielding member 7 is attached to the opening portion on the front surface (object side) of the cylindrical lens holding member 6 , thereby restricting unnecessary light rays from the peripheral portion of the image from entering the optical system 10 .
  • the light shielding sheet 8 functions to remove unnecessary light (ie, shield interference light) from reflection inside the structure outside the effective portion of the lens by being disposed at the peripheral portion between the lenses. Thereby, the quality of an image or the like captured by the imaging device 1 is improved.
  • the optical system 10 has at least one light shielding sheet 8 .
  • the optical system 10 of the present embodiment includes a plurality of (five in the example shown in FIG. 1 ) very thin light shielding sheets 8 .
  • the light shielding sheet 8 is respectively disposed between the first lens 11 and the second lens 12 , between the second lens 12 and the third lens 13 , between the fourth lens 14 and the fifth lens 15 , and between the fifth lens 15 between the sixth lens 16 and the sixth lens 16 and the seventh lens 17 .
  • the first lens 11 and the second lens 12 have negative refractive power, respectively. Since the first lens 11 and the second lens 12 have a total of four lens interfaces 11a, 11b, 12a, and 12b, in the optical system 10 (the imaging device 1), a desired viewing angle of 130 degrees or more is secured and a desired Distortion aberration shape. Assuming that the first lens 11 and the second lens 12 are composed of a single lens with a negative refractive power, since the lens interface has only two sides, it is difficult to obtain a desired distortion image corresponding to the angle of view of the light incident on the optical system 10 Difference.
  • the object-side surface (lens interface) 11a of the first lens 11 is a surface exclusively for adjusting the viewing angle.
  • the balance of the generated distortion aberration is shared by the surface (lens interface) closer to the image side than the object-side surface 11 a of the first lens 11 .
  • the image-side surfaces 11b and 12b of the first lens 11 and the second lens 12 are concave surfaces (surfaces recessed toward the object side), respectively. Accordingly, by adjusting the negative distortion aberration generated on the surfaces 11b and 12b on the image side with respect to each incident angle, it is possible to reduce the size of the optical system 10 and adjust the distortion (perspective distortion) of the three-dimensional object. .
  • the surface 12 a on the object side of the second lens 12 can adjust the generated aberration according to the distance between the first lens 11 and the second lens 12 .
  • the first lens 11 and the second lens 12 are each composed of lenses having negative refractive power, the overall size of the optical system 10 (the imaging device 1 ) is increased, but the object-side surface of the second lens 12 is The shape of 12a has a degree of freedom, and even if the distance between the first lens 11 and the second lens 12 is small, the generation of aberrations can be suppressed.
  • the third lens 13 has positive refractive power.
  • the object-side surface 13a of the third lens 13 is a convex surface, and the image-side surface 13b of the third lens 13 is a concave surface.
  • the third lens 13 assists in the miniaturization of the optical system 10 (the imaging device 1 ) by converging the light rays of a wide range of viewing angles that pass through the first lens 11 and the second lens 12 in the optical system 10 .
  • the optical system 10 can easily receive light rays with a wide range of viewing angles.
  • the light beam reflected by the image-side surface 13b of the third lens 13 travels backward on the object-side surface 13a, total reflection may occur, but this can be eliminated by making the object-side surface 13a of the third lens 13 a convex surface. Unwanted total reflected light.
  • the aberration correction ability of the lens groups after the fourth lens 14 and the aberration correction ability of the optical system 10 as a whole can be obtained. Balanced, as a result, the imaging quality in the optical system 10 can be improved, and the imaging can be made more vivid.
  • the fourth lens 14 has positive refractive power.
  • the object-side surface 14a of the fourth lens 14 is a convex surface
  • the image-side surface 14b of the fourth lens 14 is a convex surface.
  • the fourth lens 14 shares the positive refractive power with the fifth lens 15 in order to avoid excessive aberration or stray light caused by the excessively large surface curvature of the fourth lens 14 .
  • generation of aberration is suppressed, and the symmetry in the optical system 10 is improved.
  • the fifth lens 15 has positive refractive power.
  • the object-side surface 15a of the fifth lens 15 is a concave surface
  • the image-side surface 15b of the fifth lens 15 is a convex surface.
  • the fifth lens 15 cooperates with the fourth lens 14 to ensure sufficient light collecting power.
  • the image-side surface 15b of the fifth lens 15 a convex surface, sufficient light-collecting power is obtained in the peripheral portion of the viewing angle range of the optical system 10, and as a result, it is easy to secure optics with a wide viewing angle range The amount of ambient light in the system 10 .
  • the sixth lens 16 has negative refractive power.
  • the object-side surface 16a of the sixth lens 16 is a concave surface, and the image-side surface of the sixth lens 16 is a convex surface.
  • the sixth lens 16 is made of a highly dispersive material, so that the chromatic aberration (Lateral Chromatic Aberration) of the image height portion is corrected particularly well.
  • the object-side surface 16 a is concave and the image-side surface 16 b is convex, so that the sixth lens 16 has an advantageous structure against non-axial aberrations such as astigmatism.
  • the seventh lens 17 has positive refractive power.
  • the center portion (near the center) 171 a of the object-side surface 17 a of the seventh lens 17 is a convex surface
  • the image-side surface 17 b is a convex surface.
  • the surface 17a on the object side is an aspherical surface having at least one inflection point on the peripheral portion 172a of the central portion 171a.
  • the seventh lens 17 cooperates with the eighth lens 18 to adjust astigmatism.
  • the eighth lens 18 has negative refractive power.
  • the object-side surface 18a of the eighth lens 18 is a concave surface, and the center portion (near the center) 181b of the image-side surface 18b is a concave surface.
  • the surface 18b on the image side is an aspheric surface having at least one inflection point on the peripheral portion 182b of the center portion 181b (see FIG. 3).
  • the eighth lens 18 cooperates with the seventh lens 17 to adjust astigmatism.
  • the seventh lens 17 and the eighth lens 18 by sharing the adjustment of astigmatism between the seventh lens 17 and the eighth lens 18, the shapes of the respective lenses can be easily and uniformly formed, and thus the seventh lens 17 And the formability of the eighth lens 18 is good.
  • the curvature of field and distortion aberration can be adjusted by the air lens formed between the image-side surface 17b of the seventh lens 17 and the object-side surface 18a of the eighth lens 18, a clearer image can be obtained. .
  • the angle (CRA) of the light rays reaching the photoelectric conversion element 2 from the seventh lens 17 can be optimized. Furthermore, by adjusting the distortion aberration generated in the eighth lens 18 and the distortion aberration generated in the first lens 11 and the second lens 12, the back focus of the imaging device 1 can be optimized, and the overall imaging device 1 can be reduced in size change.
  • the focal length of the first lens 11 is set to f1 and the focal length of the second lens 12 is set to f2, it is preferable to satisfy:
  • the first lens 11 and the second lens 12 share the negative refractive power, so that the expansion of the viewing angle and the optimization of the generation amount of distortion aberration are realized. Furthermore, the shape of the large-sized first lens 11 can be smoothed, thereby improving the productivity of the first lens 11 .
  • the negative refractive power obtained by the two lenses of the first lens 11 and the second lens 12 can be sufficiently increased, whereby a sufficient field of view angle (FOV) can be obtained in the optical system 10 .
  • the distance along the optical axis from the image-side surface 13b of the third lens 13 to the object-side surface 14a of the fourth lens 14 along the optical axis is set to T34, and the sixth lens
  • the distance along the optical axis from the image-side surface 16b of the seventh lens 16 to the object-side surface 17a of the seventh lens 17 is set to T67, it is preferable to satisfy:
  • the spatial arrangement in the optical system 10 is optimized, and the correction capability of field curvature aberration is improved, whereby a sharp image can be obtained up to the peripheral portion of the image.
  • the thickness along the optical axis of the first lens 11 is set as CT1
  • the thickness along the optical axis of the eighth lens 18 is set as CT8
  • the second lens 12 when the distance along the optical axis from the image-side surface 11b of the first lens 11 to the object-side surface 12a of the second lens 12 along the optical axis is set to T12, the second lens 12 The distance along the optical axis from the image-side surface 12b of the third lens 13 to the object-side surface 13a of the third lens 13 is set as T23, and the image-side surface 13b of the third lens 13 to the object-side surface of the fourth lens 14 is set as T23 When the distance along the optical axis of 14a is set as T34, it is preferable to satisfy:
  • the distance along the optical axis from the image-side surface 11b of the first lens 11 to the object-side surface 12a of the second lens 12 and the distance from the image-side surface 12b of the second lens 12 along the optical axis are optimized respectively.
  • the distance to the object-side surface 13a of the third lens 13 along the optical axis can reduce the effective radius of each lens of the first lens 11 and the second lens 12, respectively, and thus, the size of the optical system 10 can be reduced. optimization.
  • the optical system 10 obtains a wide imaging (imaging) range that is characteristic of the wide-angle lens.
  • the depth of field can be increased, and thus the structure (driving unit 4 ) for driving the lens in the optical axis direction can be eliminated, so that the photoelectric conversion element 2 can be fixed to the optical system 10 .
  • the maximum effective radius of the object-side surface 11a of the first lens 11 is Y11
  • the maximum effective radius of the image-side surface 18b of the eighth lens is set to be Y11.
  • the effective radius is set to Y82, it is preferable to satisfy:
  • the focal length of the entire optical system 10 when the focal length of the entire optical system 10 is set to f, the focal length of the fourth lens 14 is set to f4, and the focal length of the fifth lens 15 is set to f5, it is preferable to satisfy:
  • the distance along the optical axis from the image-side surface 16b of the sixth lens 16 to the object-side surface 17a of the seventh lens 17 along the optical axis is denoted as T67, and the distance along the optical axis of the seventh lens 17 is
  • the thickness on the optical axis is set as CT7
  • the distance along the optical axis from the image-side surface 17b of the seventh lens 17 to the object-side surface 18a of the eighth lens 18 along the optical axis is set as T78
  • the eighth lens 18 When the thickness along the optical axis is set as CT8, it is preferable to satisfy:
  • the seventh lens 17 and the eighth lens 18 arranged on the image side can be reduced in size.
  • the radius of curvature of the surface 17a on the object side of the seventh lens 17 is R13
  • the radius of curvature of the surface 18b on the image side of the eighth lens 18 is R16
  • the seventh lens 17 The thickness along the optical axis (central thickness) of the 10000000 is set as CT7
  • the distance along the optical axis from the image-side surface of the seventh lens to the object-side surface of the eighth lens is set as T78
  • the eighth lens is set as T78.
  • the optical system 10 can be reduced in thickness in the optical axis direction while achieving optimum balance between the size and wide-angle characteristics of the optical system 10 .
  • the displacement amount in the optical axis direction is set to Sag11, and the displacement in the optical axis direction from the intersection with the optical axis in the object side surface 13a of the third lens 13 to the maximum effective radius position of the object side surface 13a
  • the amount is set to Sag31, it is preferable to satisfy:
  • the distortion aberration amount of the maximum image height is DST1.0
  • the distortion aberration amount of the 70% image height of the maximum image height is DST0.7
  • the maximum angle of view is When set to FOV, it is preferable to satisfy:
  • the focal length of the entire optical system 10 when the focal length of the entire optical system 10 is f, the combined focal length of the first lens 11 and the second lens 12 is f12, and the focal length of the third lens 13 is f3, Preferably meet:
  • the distance along the optical axis from the aperture stop 5 to the surface 18 b on the image side of the eighth lens 18 is set as SD, and the distance from the surface 11 a on the object side of the first lens 11 is set as SD.
  • the distance along the optical axis to the image-side surface 18b of the eighth lens 18 is set as TD, it is preferable to satisfy:
  • the transmission range of the light beam occupying the entire optical system 10 can be increased, whereby the optical system 10 can be miniaturized and the optical performance can be optimized.
  • the distance between the maximum inflection point of the surface 18b on the image side of the eighth lens 18 and the optical axis in the direction orthogonal to the optical axis is Yc82, and the optical
  • the overall focal length of the system 10 is set to f, it is preferable to satisfy:
  • the incident angle of light incident on the photoelectric conversion element 2 can be appropriately set, and the occurrence of astigmatism can be suppressed.
  • the image quality can be improved by appropriately assigning the bending force (negative component) of the first lens 11 and the second lens 12 and the bending force (positive component) of the fifth lens 15 .
  • the distance along the optical axis from the image-side surface 11 b of the first lens 11 to the object-side surface 12 a of the second lens 12 along the optical axis is set to T12
  • the distance from the second lens 12 The distance along the optical axis from the image-side surface 12b to the object-side surface 13a of the third lens 13 is set as T23
  • the distance from the image-side surface 13b of the third lens to the object-side surface 14a of the fourth lens is taken as T23.
  • the distance to the optical axis is set as T34
  • the distance along the optical axis from the image-side surface 14b of the fourth lens 14 to the object-side surface 15a of the fifth lens 15 along the optical axis is set as T45
  • T67 the distance along the optical axis from the image-side surface 17b of the seventh lens 17 to the object-side surface 18a of the eighth lens 18
  • the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, the seventh lens 17, and the eighth lens 18 When the maximum value of the refractive index in each lens is set as Nmax, it is preferable to satisfy:
  • the balance of the lenses of the entire optical system 10 can be achieved, and aberrations can be reduced and a lens shape that can be easily molded can be realized.
  • the material of each of the lenses 11 to 18 included in the optical system 10 described above may be plastic or glass.
  • the material cost is low, the workability is excellent, and the processing time is also short, so that the production cost can be reduced.
  • the material of the lens is glass, since the refractive index is generally higher than that of plastic, the degree of freedom in designing the lens is improved, and higher definition or smaller size can be achieved.
  • the object-side surfaces 11 a to 18 a and the image-side surfaces 11 b to 18 b of each of the lenses 11 to 18 of the optical system 10 are preferably aspherical surfaces having a significantly greater degree of freedom than spherical surfaces. Thereby, aberrations can be reduced, a captured image can be improved in high definition, or the entire optical system 10 can be reduced in size.
  • the angle of view of a conventional wide-angle lens of about 120 degrees is greatly expanded to, for example, about 150 degrees. Details are as follows.
  • the optical system 10 can realize the incidence of light in an ultra-wide-angle range (wide-angle converter) , and the desired distortion aberration can be ensured even when the full angle of view is about 150 degrees.
  • the fourth to sixth lenses 14 to 16 constitute a main lens group that determines the imaging performance of the optical system 10 (lens).
  • the fourth lens 14 is a convex lens
  • the fifth lens 15 is a convex lens
  • the sixth lens 16 is a concave lens
  • the image-side surfaces 14b, 15b, and 16b of the respective lenses 14, 15, and 16 face the photoelectric conversion element 2
  • the spherical aberration and coma aberration in the optical system 10 can be corrected favorably by being convex.
  • the sixth lens 16 when the sixth lens 16 is formed of a highly dispersive material, it is possible to correct chromatic aberration (Lateral Chromatic Aberration) in a portion with a high image height particularly well. Further, in the sixth lens 16 , by making the object-side surface 16 a concave and the image-side surface 16 b convex, the sixth lens 16 has a structure advantageous for non-axial aberrations such as astigmatism.
  • the seventh lens 17 and the eighth lens 18 are configured to coordinately adjust astigmatism.
  • the seventh lens 17 and the eighth lens 18 by sharing the adjustment of astigmatism between the seventh lens 17 and the eighth lens 18, the shapes of the respective lenses can be easily and uniformly formed, and thus the seventh lens 17 And the formability of the eighth lens 18 is good.
  • the curvature of field and distortion aberration can be adjusted by the air lens formed between the image-side surface 17b of the seventh lens 17 and the object-side surface 18a of the eighth lens 18, a clearer image can be obtained. .
  • the angle (CRA) of light rays reaching the photoelectric conversion element 2 from the seventh lens 17 can be optimized. Furthermore, by adjusting the distortion aberration generated in the eighth lens 18 and the distortion aberration generated in the first lens 11 and the second lens 12, the back focus of the imaging device 1 can be optimized, and the overall imaging device 1 can be reduced in size change.
  • the optical system 10 and the imaging device 1 of the present embodiment since the same field of view specification as that of the imaging device mounted on the action close-up (for example: product name GoPro (registered trademark)) can be achieved, it can be mounted on the mobile Due to the size of the terminal, due to the recent expansion of the 5G environment, it is possible to transmit real-time ultra-wide-angle video from the mobile terminal similar to the close-up of the action, and it is possible to expand the use of the mobile terminal.
  • product name GoPro registered trademark
  • Embodiments 1 to 7 of the optical imaging device of the present disclosure will be described. First, the common configuration will be described, and then the configuration of each embodiment will be described.
  • the basic configuration of the optical imaging device of each embodiment is the same as that of the optical imaging device 1 of the above-described embodiment.
  • the optical imaging device of each embodiment includes an optical system, a drive unit, an IR cut filter, and a photoelectric conversion element.
  • the optical system has eight lenses. Specifically, the optical system includes a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, and a fourth lens, which are arranged in this order in the direction from the object side to the image side. Seven lenses, and an eighth lens.
  • the optical system of each embodiment images the object information on the object side (light from the object side) on the surface (light-receiving surface) of the photoelectric conversion element as the imaging surface through the IR cut filter.
  • FIG. 7 is a schematic diagram of the optical imaging device 1 of the first embodiment
  • FIG. 8 shows spherical aberration, astigmatism, and distortion (distortion aberration) in the optical system 10 of the first embodiment in order from left to right. aberration diagram.
  • the first lens 11 has negative refractive power and is formed of a plastic material.
  • the object-side surface 11a is a convex surface
  • the image-side surface 11b is a concave surface.
  • Both the object-side surface 11 a and the image-side surface 11 b of the first lens 11 are aspherical surfaces.
  • the second lens 12 has negative refractive power and is formed of a plastic material.
  • the object-side surface 12a is concave
  • the image-side surface 12b is concave.
  • Both the object-side surface 12a and the image-side surface 12b of the second lens 12 are aspherical surfaces.
  • the third lens 13 has positive refractive power and is formed of a plastic material.
  • the object-side surface 13a is convex
  • the image-side surface 13b is concave.
  • Both the object-side surface 13 a and the image-side surface 13 b of the third lens 13 are aspherical surfaces.
  • the fourth lens 14 has positive refractive power and is formed of a plastic material.
  • the object-side surface 14a is a convex surface
  • the image-side surface 14b is a convex surface.
  • Both the object-side surface 14a and the image-side surface 14b of the fourth lens 14 are aspherical surfaces.
  • the fifth lens 15 has positive refractive power and is formed of a plastic material.
  • the object-side surface 15a is a concave surface
  • the image-side surface 15b is a convex surface.
  • Both the object-side surface 15a and the image-side surface 15b of the fifth lens 15 are aspherical surfaces.
  • the sixth lens 16 has negative refractive power and is formed of a plastic material.
  • the surface 16a on the object side is a concave surface
  • the surface 16b on the image side is a convex surface.
  • Both the object-side surface 16a and the image-side surface 16b of the sixth lens 16 are aspherical surfaces.
  • the seventh lens 17 has positive refractive power and is formed of a plastic material.
  • the object-side surface 17a is a convex surface
  • the image-side surface 17b is a convex surface.
  • Both the object-side surface 17a and the image-side surface 17b of the seventh lens 17 are aspherical surfaces.
  • the eighth lens 18 has negative refractive power and is formed of a plastic material.
  • the object-side surface 18a is a concave surface
  • the image-side surface 18b is a concave surface.
  • Both the object-side surface 18a and the image-side surface 18b of the eighth lens 18 are aspherical surfaces.
  • the aspherical expressions of the lenses 11 to 18 included in the optical system 10 of the first embodiment are as follows.
  • Table 1 below shows actual numerical values for the structure of the lens
  • Table 2 shows actual numerical values for the aspheric coefficients of each lens surface
  • Table 3 shows actual numerical values for the conditional expressions of the present disclosure.
  • TL/ImgH 2.556 of Table 3 satisfies TL/ImgH ⁇ 3.
  • ⁇ T23/T34 0.871 of Table 3 satisfies 0 ⁇ T23/T34 ⁇ 2.0.
  • CT7/CT8 1.500 in Table 3 satisfies 1.0 ⁇ CT7/CT8 ⁇ 2.0.
  • CT1/CT8 1.125 in Table 3 satisfies 0.5 ⁇ CT1/CT8 ⁇ 1.5.
  • FIG. 9 is a schematic diagram of the optical imaging device 1 of the second embodiment
  • FIG. 10 shows spherical aberration, astigmatism, and distortion (distortion aberration) in the optical system 20 of the second embodiment in order from left to right aberration diagram.
  • the first lens 21 has negative refractive power and is formed of a plastic material.
  • the object-side surface 21a is a concave surface
  • the image-side surface 21b is a concave surface.
  • Both the object-side surface 21 a and the image-side surface 21 b of the first lens 21 are aspherical surfaces.
  • the second lens 22 has negative refractive power and is formed of a plastic material.
  • the object-side surface 22a is concave
  • the image-side surface 22b is concave.
  • Both the object-side surface 22a and the image-side surface 22b of the second lens 22 are aspherical surfaces.
  • the third lens 23 has positive refractive power and is formed of a plastic material.
  • the object-side surface 23a is a convex surface
  • the image-side surface 23b is a concave surface.
  • Both the object-side surface 23a and the image-side surface 23b of the third lens 23 are aspherical surfaces.
  • the fourth lens 24 has positive refractive power and is formed of a plastic material.
  • the object-side surface 24a is a convex surface
  • the image-side surface 24b is a convex surface.
  • Both the object-side surface 24a and the image-side surface 24b of the fourth lens 24 are aspherical surfaces.
  • the fifth lens 25 has positive refractive power and is formed of a plastic material.
  • the object-side surface 25a is a concave surface
  • the image-side surface 25b is a convex surface.
  • Both the object-side surface 25a and the image-side surface 25b of the fifth lens 25 are aspherical surfaces.
  • the sixth lens 26 has negative refractive power and is formed of a plastic material.
  • the object-side surface 26a is a concave surface
  • the image-side surface 26b is a convex surface.
  • Both the object-side surface 26a and the image-side surface 26b of the sixth lens 26 are aspherical surfaces.
  • the seventh lens 27 has positive refractive power and is formed of a plastic material.
  • the object-side surface 27a is a convex surface
  • the image-side surface 27b is a convex surface.
  • Both the object-side surface 27a and the image-side surface 27b of the seventh lens 27 are aspherical surfaces.
  • the eighth lens 28 has negative refractive power and is formed of a plastic material.
  • the object-side surface 28a is concave
  • the image-side surface 28b is concave.
  • Both the object-side surface 28a and the image-side surface 28b of the eighth lens 28 are aspherical surfaces.
  • the aspherical formula of each of the lenses 21 to 28 included in the optical system 20 of the second embodiment is the same as the formula (1) of the first embodiment.
  • the term of the 15th degree or more (n ⁇ 15) of the formula (1) is calculated as 0.
  • Table 4 below shows actual numerical values for the structure of the lens
  • Table 5 shows actual numerical values for aspheric coefficients of each lens surface
  • Table 6 shows actual numerical values for the conditional expressions of the present disclosure.
  • ⁇ T67/T34 0.331 of Table 6 satisfies 0 ⁇ T67/T34 ⁇ 1.0.
  • FIG. 11 is a schematic diagram of the optical imaging device 1 of the third embodiment
  • FIG. 12 shows spherical aberration, astigmatism, and distortion (distortion aberration) in the optical system 30 of the third embodiment in order from left to right. aberration diagram.
  • the first lens 31 has negative refractive power and is formed of a plastic material.
  • the object-side surface 31a is a convex surface
  • the image-side surface 31b is a concave surface.
  • Both the object-side surface 31 a and the image-side surface 31 b of the first lens 31 are aspherical surfaces.
  • the second lens 32 has negative refractive power and is formed of a plastic material.
  • the object-side surface 32a is a convex surface
  • the image-side surface 32b is a concave surface.
  • Both the object-side surface 32a and the image-side surface 32b of the second lens 32 are aspherical surfaces.
  • the third lens 33 has positive refractive power and is formed of a plastic material.
  • the object-side surface 33a is a convex surface
  • the image-side surface 33b is a concave surface.
  • Both the object-side surface 33a and the image-side surface 33b of the third lens 33 are aspherical surfaces.
  • the fourth lens 34 has a positive refractive power and is formed of a plastic material.
  • the object-side surface 34a is a convex surface
  • the image-side surface 34b is a convex surface.
  • Both the object-side surface 34a and the image-side surface 34b of the fourth lens 34 are aspherical surfaces.
  • the fifth lens 35 has positive refractive power and is formed of a plastic material.
  • the object-side surface 35a is a concave surface
  • the image-side surface 35b is a convex surface.
  • Both the object-side surface 35 a and the image-side surface 35 b of the fifth lens 35 are aspherical surfaces.
  • the sixth lens 36 has negative refractive power and is formed of a plastic material.
  • the object-side surface 36a is a concave surface
  • the image-side surface 36b is a convex surface.
  • Both the object-side surface 36a and the image-side surface 36b of the sixth lens 36 are aspherical surfaces.
  • the seventh lens 37 has positive refractive power and is formed of a plastic material.
  • the object-side surface 37a is a convex surface
  • the image-side surface 37b is a convex surface.
  • Both the object-side surface 37 a and the image-side surface 37 b of the seventh lens 37 are aspherical surfaces.
  • the eighth lens 38 has negative refractive power and is formed of a plastic material.
  • the object-side surface 38a is a concave surface
  • the image-side surface 38b is a concave surface.
  • Both the object-side surface 38 a and the image-side surface 38 b of the eighth lens 38 are aspherical surfaces.
  • the aspherical formula of each of the lenses 31 to 38 included in the optical system 30 of the present embodiment is the same as the formula (1) of the first embodiment.
  • the term of the 15th degree or higher (n ⁇ 15) of the formula (1) is calculated as 0.
  • Table 7 below shows actual numerical values for the structure of the lens
  • Table 8 shows actual numerical values for the aspheric coefficients of each lens surface
  • Table 9 shows actual numerical values for the conditional expressions of the present disclosure.
  • CT1/CT8 1.000 in Table 9 satisfies 0.5 ⁇ CT1/CT8 ⁇ 1.5.
  • FIG. 13 is a schematic diagram of the optical imaging device 1 of the fourth embodiment
  • FIG. 14 shows spherical aberration, astigmatism, and distortion (distortion aberration) in the optical system 40 of the fourth embodiment in order from left to right. aberration diagram.
  • the first lens 41 has negative refractive power and is formed of a plastic material.
  • the object-side surface 41a is a convex surface
  • the image-side surface 41b is a concave surface.
  • Both the object-side surface 41 a and the image-side surface 41 b of the first lens 41 are aspherical surfaces.
  • the second lens 42 has negative refractive power and is formed of a plastic material.
  • the object-side surface 42a is a convex surface
  • the image-side surface 42b is a concave surface.
  • Both the object-side surface 42a and the image-side surface 42b of the second lens 42 are aspherical surfaces.
  • the third lens 43 has positive refractive power and is formed of a plastic material.
  • the object-side surface 43a is a convex surface
  • the image-side surface 43b is a concave surface.
  • Both the object-side surface 43a and the image-side surface 43b of the third lens 43 are aspherical surfaces.
  • the fourth lens 44 has positive refractive power and is formed of a plastic material.
  • the object-side surface 44a is a convex surface
  • the image-side surface 44b is a convex surface.
  • Both the object-side surface 44a and the image-side surface 44b of the fourth lens 44 are aspherical surfaces.
  • the fifth lens 45 has positive refractive power and is formed of a plastic material.
  • the object-side surface 45a is a concave surface
  • the image-side surface 45b is a convex surface.
  • Both the object-side surface 45a and the image-side surface 45b of the fifth lens 45 are aspherical surfaces.
  • the sixth lens 46 has negative refractive power and is formed of a plastic material.
  • the object-side surface 46a is a concave surface
  • the image-side surface 46b is a convex surface.
  • Both the object-side surface 46a and the image-side surface 46b of the sixth lens 46 are aspherical surfaces.
  • the seventh lens 47 has positive refractive power and is formed of a plastic material.
  • the object-side surface 47a is a convex surface
  • the image-side surface 47b is a convex surface.
  • Both the object-side surface 47a and the image-side surface 47b of the seventh lens 47 are aspherical surfaces.
  • the eighth lens 48 has negative refractive power and is formed of a plastic material.
  • the surface 48a on the object side is a concave surface
  • the surface 48b on the image side is a concave surface.
  • Both the object-side surface 48a and the image-side surface 48b of the eighth lens 48 are aspherical surfaces.
  • the aspherical formula of each of the lenses 41 to 48 included in the optical system 40 of the present embodiment is the same as the formula (1) of the first embodiment.
  • the term of the 15th degree or higher (n ⁇ 15) of the formula (1) is also calculated as 0.
  • Table 10 shows actual numerical values for the structure of the lens
  • Table 11 shows actual numerical values for aspheric coefficients of each lens surface
  • Table 12 shows actual numerical values for the conditional expressions of the present disclosure.
  • T67/CT7 0.231 in Table 12 satisfies T67/CT7 ⁇ 0.50.
  • T78/CT8 0.218 of Table 12 satisfies T78/CT8 ⁇ 0.70.
  • ⁇ f/(CT7+T78+CT8)7 2.212 in Table 12 satisfies 0.3 ⁇ f/(CT7+T78+CT8) ⁇ 3.5.
  • CT1/CT8 1.196 in Table 12 satisfies 0.5 ⁇ CT1/CT8 ⁇ 1.5.
  • FIG. 15 is a schematic diagram of the optical imaging device 1 of the fifth embodiment
  • FIG. 16 is a diagram showing spherical aberration, astigmatism, and distortion (distortion aberration) in the optical system 50 of the fifth embodiment in order from left to right aberration diagram.
  • the first lens 51 has negative refractive power and is formed of a plastic material.
  • the object-side surface 51a is a convex surface
  • the image-side surface 51b is a concave surface.
  • Both the object-side surface 51 a and the image-side surface 51 b of the first lens 51 are aspherical surfaces.
  • the second lens 52 has negative refractive power and is formed of a plastic material.
  • the object-side surface 52a is a convex surface
  • the image-side surface 52b is a concave surface.
  • Both the object-side surface 52a and the image-side surface 52b of the second lens 52 are aspherical surfaces.
  • the third lens 53 has positive refractive power and is formed of a plastic material.
  • the object-side surface 53a is a convex surface
  • the image-side surface 53b is a concave surface.
  • Both the object-side surface 53a and the image-side surface 53b of the third lens 53 are aspherical surfaces.
  • the fourth lens 54 has positive refractive power and is formed of a plastic material.
  • the object-side surface 54a is a convex surface
  • the image-side surface 54b is a convex surface.
  • Both the object-side surface 54a and the image-side surface 54b of the fourth lens 54 are aspherical surfaces.
  • the fifth lens 55 has positive refractive power and is formed of a plastic material.
  • the object-side surface 55a is a concave surface
  • the image-side surface 55b is a convex surface.
  • Both the object-side surface 55a and the image-side surface 55b of the fifth lens 55 are aspherical surfaces.
  • the sixth lens 56 has negative refractive power and is formed of a plastic material.
  • the object-side surface 56a is a concave surface
  • the image-side surface 56b is a convex surface.
  • Both the object-side surface 56a and the image-side surface 56b of the sixth lens 56 are aspherical surfaces.
  • the seventh lens 57 has positive refractive power and is formed of a plastic material.
  • the object-side surface 57a is a convex surface
  • the image-side surface 57b is a convex surface.
  • Both the object-side surface 57a and the image-side surface 57b of the seventh lens 57 are aspherical surfaces.
  • the eighth lens 58 has negative refractive power and is formed of a plastic material.
  • the object-side surface 58a is a concave surface
  • the image-side surface 58b is a concave surface.
  • Both the object-side surface 58a and the image-side surface 58b of the eighth lens 58 are aspherical surfaces.
  • the aspherical formula of each of the lenses 51 to 58 included in the optical system 50 of the present embodiment is the same as the formula (1) of the first embodiment.
  • the term of the 15th degree or higher (n ⁇ 15) of the formula (1) is also calculated as 0.
  • Table 13 below shows actual numerical values for the structure of the lens
  • Table 14 shows actual numerical values for aspheric coefficients of each lens surface
  • Table 15 shows actual numerical values for the conditional expressions of the present disclosure.
  • CT1/CT8 1.125 in Table 15 satisfies 0.5 ⁇ CT1/CT8 ⁇ 1.5.
  • FIG. 17 is a schematic diagram of the optical imaging device 1 of the sixth embodiment
  • FIG. 18 is a diagram showing spherical aberration, astigmatism, and distortion (distortion aberration) in the optical system 60 of the sixth embodiment in order from left to right. aberration diagram.
  • the first lens 61 has negative refractive power and is formed of a plastic material.
  • the object-side surface 61a is a convex surface
  • the image-side surface 61b is a concave surface.
  • Both the object-side surface 61 a and the image-side surface 61 b of the first lens 61 are aspherical surfaces.
  • the second lens 62 has negative refractive power and is formed of a plastic material.
  • the object-side surface 62a is concave
  • the image-side surface 62b is concave.
  • Both the object-side surface 62a and the image-side surface 62b of the second lens 62 are aspherical surfaces.
  • the third lens 63 has positive refractive power and is formed of a plastic material.
  • the object-side surface 63a is a convex surface
  • the image-side surface 63b is a concave surface.
  • Both the object-side surface 63 a and the image-side surface 63 b of the third lens 63 are aspherical surfaces.
  • the fourth lens 64 has positive refractive power and is formed of a plastic material.
  • the object-side surface 64a is a convex surface
  • the image-side surface 64b is a convex surface.
  • Both the object-side surface 64a and the image-side surface 64b of the fourth lens 64 are aspherical surfaces.
  • the fifth lens 65 has positive refractive power and is formed of a plastic material.
  • the object-side surface 65a is a concave surface
  • the image-side surface 65b is a convex surface.
  • Both the object-side surface 65a and the image-side surface 65b of the fifth lens 65 are aspherical surfaces.
  • the sixth lens 66 has negative refractive power and is formed of a plastic material.
  • the object-side surface 66a is concave
  • the image-side surface 66b is convex. Both the object-side surface 66a and the image-side surface 66b of the sixth lens 66 are aspherical surfaces.
  • the seventh lens 67 has positive refractive power and is formed of a plastic material.
  • the object-side surface 67a is a convex surface
  • the image-side surface 67b is a convex surface.
  • Both the object-side surface 67a and the image-side surface 67b of the seventh lens 67 are aspherical surfaces.
  • the eighth lens 68 has negative refractive power and is formed of a plastic material.
  • the object-side surface 68a is concave
  • the image-side surface 68b is concave.
  • Both the object-side surface 68a and the image-side surface 68b of the eighth lens 68 are aspherical surfaces.
  • the aspherical formula of each of the lenses 61 to 68 included in the optical system 60 of the present embodiment is the same as the formula (1) of the first embodiment.
  • the term of the 15th degree or higher (n ⁇ 15) of the formula (1) is also calculated as 0.
  • Table 16 lists actual numerical values for the structure of the lens
  • Table 17 lists actual numerical values for the aspheric coefficients of each lens surface
  • Table 18 lists actual numerical values for the conditional expressions of the present disclosure.
  • TL/ImgH 2.216 of Table 18 satisfies TL/ImgH ⁇ 3.
  • T67/CT7 0.167 in Table 18 satisfies T67/CT7 ⁇ 0.50.
  • T78/CT8 0.250 in Table 18 satisfies T78/CT8 ⁇ 0.70.
  • ⁇ f/(CT7+T78+CT8)7 2.202 in Table 18 satisfies 0.3 ⁇ f/(CT7+T78+CT8) ⁇ 3.5.
  • FIG. 19 is a schematic diagram of the optical imaging device 1 of the seventh embodiment
  • FIG. 20 is a diagram showing spherical aberration, astigmatism, and distortion (distortion aberration) in the optical system 70 of the seventh embodiment in order from left to right. aberration diagram.
  • the first lens 71 has negative refractive power and is formed of a plastic material.
  • the object-side surface 71a is a convex surface
  • the image-side surface 71b is a concave surface.
  • Both the object-side surface 71 a and the image-side surface 71 b of the first lens 71 are aspherical surfaces.
  • the second lens 72 has negative refractive power and is formed of a plastic material.
  • the object-side surface 72a is concave
  • the image-side surface 72b is concave.
  • Both the object-side surface 72a and the image-side surface 72b of the second lens 72 are aspherical surfaces.
  • the third lens 73 has positive refractive power and is formed of a plastic material.
  • the object-side surface 73a is a convex surface
  • the image-side surface 73b is a concave surface.
  • Both the object-side surface 73a and the image-side surface 73b of the third lens 73 are aspherical surfaces.
  • the fourth lens 74 has positive refractive power and is formed of a plastic material.
  • the object-side surface 74a is a convex surface
  • the image-side surface 74b is a convex surface.
  • Both the object-side surface 74a and the image-side surface 74b of the fourth lens 74 are aspherical surfaces.
  • the fifth lens 75 has positive refractive power and is formed of a plastic material.
  • the object-side surface 75a is a concave surface
  • the image-side surface 75b is a convex surface.
  • Both the object-side surface 75a and the image-side surface 75b of the fifth lens 75 are aspherical surfaces.
  • the sixth lens 76 has negative refractive power and is formed of a plastic material.
  • the object-side surface 76a is a concave surface
  • the image-side surface 76b is a convex surface.
  • Both the object-side surface 76a and the image-side surface 76b of the sixth lens 76 are aspherical surfaces.
  • the seventh lens 77 has positive refractive power and is formed of a plastic material.
  • the object-side surface 77a is a convex surface
  • the image-side surface 77b is a convex surface.
  • Both the object-side surface 77a and the image-side surface 77b of the seventh lens 77 are aspherical surfaces.
  • the eighth lens 78 has negative refractive power and is formed of a plastic material.
  • the object-side surface 78a is concave
  • the image-side surface 78b is concave.
  • Both the object-side surface 78a and the image-side surface 78b of the eighth lens 78 are aspherical surfaces.
  • the aspherical formula of each of the lenses 71 to 78 included in the optical system 70 of the present embodiment is the same as the formula (1) of the first embodiment.
  • the term of the 15th degree or higher (n ⁇ 15) of the formula (1) is also calculated as 0.
  • Table 19 lists actual numerical values for the lens structure
  • Table 20 lists actual numerical values for the aspheric coefficients of each lens surface
  • Table 21 lists actual numerical values for the conditional expressions of the present disclosure.
  • T67/CT7 0.167 in Table 21 satisfies T67/CT7 ⁇ 0.50.
  • TD Distance along the optical axis from the object-side surface of the first lens to the image-side surface of the eighth lens
  • CT1 Central thickness of the first lens
  • CT7 Center thickness of seventh lens
  • CT8 Center thickness of the eighth lens
  • T12 Distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens
  • T23 Distance along the optical axis from the image-side surface of the second lens to the object-side surface of the third lens
  • T34 Distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens
  • T45 Distance along the optical axis from the image-side surface of the fourth lens to the object-side surface of the fifth lens
  • T56 Distance along the optical axis from the image-side surface of the fifth lens to the object-side surface of the sixth lens
  • T67 Distance along the optical axis from the image-side surface of the sixth lens to the object-side surface of the seventh lens
  • T78 Distance along the optical axis from the image-side surface of the seventh lens to the object-side surface of the eighth lens
  • R7 Radius of curvature of the surface on the object side of the fourth lens
  • R8 Radius of curvature of the surface on the image side of the fourth lens
  • R13 Radius of curvature of the object-side surface of the seventh lens
  • R14 Radius of curvature of the image-side surface of the seventh lens
  • R15 Radius of curvature of the surface on the object side of the eighth lens
  • R16 Radius of curvature of the surface on the image side of the eighth lens
  • V6 Dispersion coefficient of the sixth lens
  • V7 Dispersion coefficient of the seventh lens
  • Yc82 The distance between the maximum inflection point of the image-side surface of the eighth lens and the optical axis in the direction orthogonal to the optical axis
  • Sag11 Displacement amount in the optical axis direction from the intersection with the optical axis in the object-side surface of the first lens to the maximum effective radius position of the object-side surface of the first lens
  • Sag31 Displacement amount in the optical axis direction from the intersection with the optical axis in the object side surface of the third lens to the maximum effective radius position of the object side surface of the third lens
  • DST0.7 Distortion aberration amount of 70% of the maximum image height
  • Nmax the maximum value of the refractive index of 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.

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Abstract

一种光学系统（10），具备：第一透镜（11），其具有负屈光度，且其像侧的面（11b）是凹面；第二透镜（12），其具有负屈光度，且其像侧的面（12b）是凹面；第三透镜（13），其具有正屈光度，且其像侧的面（13b）是凹面；第四透镜（14），其具有正屈光度，且其像侧的面（14b）是凸面；第五透镜（15），其具有正屈光度，且其物体侧的面（15a）是凹面，并且像侧的面（15b）是凸面；第六透镜（16），其具有负屈光度，且其物体侧的面（16a）是凹面，并且像侧的面（16b）是凸面；第七透镜（17），其具有正屈光度，且其物体侧的面（17a）是中心部为凸面并且在该中心部的周边部上具有至少一个拐点的非球面，并且像侧的面（17b）是凸面；以及第八透镜（18），其物体侧的面（18a）是凹面，并且像侧的面（18b）是中心部为凹面并且在该中心部的周边部上具有至少一个拐点的非球面。

Description

摄像光学系统、以及光学摄像装置 技术领域
本公开涉及具备多个透镜的摄像光学系统，以及具备所述摄像光学系统的光学摄像装置。
背景技术
图像摄影装置的应用范围越来越广泛，车载用途，标识识别用途、娱乐用途、以及家电AI支援用途等应用范围很广，有助于科学技术的发展。尤其是作为民生用途，移动终端是非常重要的项目。
尤其在装载于移动终端的图像摄影装置中，近年来，通常具备三个以上摄像装置。
例如，具有通常变焦机构的相机镜头(摄像光学系统)是一个透镜，装载有满足从广角到远摄的所有的视场角的光学变焦透镜。在该变焦透镜中，从最宽广角端到最远远摄端的焦距之比来称为变焦倍率，该变焦倍率是变焦透镜的重要参数。
然而，对于光学变焦透镜，由于在镜头内部通常需要两个以上的在光轴方向上移动的透镜元件(组)，变焦透镜本身的尺寸变大，因此从确保可动空间的问题出发，将光学变焦透镜装载在移动终端上是不现实的。
因此，在装载于移动终端的图像摄影装置中，配置多个具备各自焦距不同的单焦点透镜(光学系统)的摄像装置(例如，超广角专用的摄像装置、标准视场角专用的摄像装置、远摄专用的摄像装置)，通过组合从各摄像装置输出的输出图像，在电子上实现了与光学变焦透镜相同的变焦效果。
在该移动终端中，与通用相机镜头相同，扩大变焦倍率是市场的需求，各公司将作为远摄专用的镜头装载了焦距更长的透镜。
另一方面，作为广角专用的镜头，装载有视场角(以下称为“FOV”)为120°左右的透镜，在该广角专用的镜头中，各公司也提出了各种提案。
例如，在专利文献1以及专利文献2CNA-107577031、CNA-107305274中，提出了监视摄像机和动作特写用的FOV为130°以上的超广角镜头。
这些是所谓的逆远摄式(复古对焦型/反向远焦型)的光学系统，其在物体侧(前头)的透镜上配置有具有大的负屈光度的凹凸透镜，以及在该透镜的像侧配置有具有正屈光度的透镜，并且在光学系统的中间配置有孔径光阑，并大量使用了球面玻璃透镜。在这种类型的光学系统中，能够扩大视场角，并且容易扩大瞳孔倍率，由此，能够大幅确保周围光量。然而，由于需要延长透镜(光学系统)本身的全长和后焦距长度，因此尺寸变大，难以装载于移动终端等。
另一方面，在专利文献3以及专利文献4中，提出了尺寸能够装载于移动终端并且视场角为120°左右的广角透镜。这些是称为所谓的远摄型的光学系统，通常用于移动终端中。这种远摄型的广角透镜通过大量使用非球面透镜而除去像差，同时缩短后焦距，从而能够缩短全长，确保充分的摄像性能。
然而，在该光学系统中，在进一步扩大视场角的情况下，由于不是像逆远摄式光学系统那样利用瞳孔倍率来补偿由Cos4幂律引起的周围光量的减少的类型，因此需要利用由畸变像差引起的光线聚光度来补偿周围光量的减少的结构。在该情况下，在本提案的透镜中，在L1、L4、L5、L6的透镜中，由于需要使远离光轴的端部的形状与中央附近相比大幅变化，因此透镜的成形困难，由此导致不仅生产率降低，而且难以确保成像性能本身。
现有技术文献
专利文献
专利文献1：公开专利公报CN107577031A
专利文献2：公开专利公报CN107305274A
专利文献3：公开专利公报CN108732716A
专利文献4：公开专利公报CN107957621A
发明内容
发明要解决的问题
因此，本公开的课题在于，提供一种尽管是小型的但仍能保持充分的成像性能，并且能够得到大的视场角的摄像光学系统，以及具备该摄像光学系统的光学摄像装置。
用于解决问题的方案
本公开的摄像光学系统，具备：
在从物体侧向像侧的方向上按顺序排列的第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜、以及第八透镜；
第一透镜具有负屈光度，其像侧的面是凹面；
第二透镜具有负屈光度，其像侧的面是凹面；
第三透镜具有正屈光度，其像侧的面是凹面；
第四透镜具有正屈光度，其像侧的面是凸面；
第五透镜具有正屈光度，其物体侧的面是凹面，并且像侧的面是凸面；
第六透镜具有负屈光度，其物体侧的面是凹面，并且像侧的面是凸面；
第七透镜，其物体侧的面是中心部为凸面并且在该中心部的周边部上具有至少一个拐点的非球面，并且像侧的面是凸面；
第八透镜，其物体侧的面是凹面，像侧的面是中心部为凹面并且在该中心部的周边部上具有至少一个拐点的非球面；
在将第一透镜的焦距设为f1，将第二透镜的焦距设为f2，将第一透镜与第二透镜的合成焦距设为f12，将第三透镜的焦距设为f3，将从第三透镜的像侧的面到第四透镜的物体侧的面的沿着光轴的距离设为T34，并将从第六透镜的像侧的面到第七透镜的物体侧的面的沿着光轴的距离设为T67时，满足：
|f1/f2|＜6
|f12/f3|＜0.5
0＜T67/T34＜1.0。
摄像光学系统具备孔径光阑，孔径光阑配置于第三透镜与第四透镜之间；
在将从第一透镜的物体侧的面到成像面的沿着光轴的距离设为TL，并将最大像高设为ImgH时，可以满足：
TL/ImgH＜3。
另外，在摄像光学系统中，
在将第四透镜的物体侧的面的曲率半径设为R7，并将该第四透镜的像侧的面的曲率半径设为R8时，可以满足：
0＜(R7+R8)/(R7-R8)＜1.0。
另外，在摄像光学系统中，
在将从第一透镜的像侧的面到第二透镜的物体侧的面的沿着光轴的距离设为T12，将从第二透镜的像侧的面到第三透镜的物体侧的面的沿着光轴的距离设为T23，并将从第三透镜的像侧的面到第四透镜的物体侧的面的沿着光轴的距离设为T34时，可以满足：
0＜T12/T23＜3.0
0＜T23/T34＜2.0。
另外，在摄像光学系统中，
在将最大视场角的二分之一设为HFOV，并将光圈值设为Fno时，可以满足：
2.0＜tan(HFOV)
1.4＜Fno＜3.0。
另外，在摄像光学系统中，
在将第一透镜的物体侧的面的最大有效半径设为Y11，并将第八透镜的像侧的面的最大有效半径设为Y82时，可以满足：
0.8＜Y11/Y82＜1.5。
另外，在摄像光学系统中，
在将第六透镜的色散系数设为V6，并将第七透镜的色散系数设为V7时，可以满足：
0＜V6/V7＜0.50。
另外，在摄像光学系统中，
在将该摄像光学系统的焦距设为f，将第四透镜的焦距设为f4，并将第五透镜的焦距设为f5时，可以满足：
0＜(f/f4)-(f/f5)＜2.0。
另外，在摄像光学系统中，
在将从第六透镜的像侧的面到第七透镜的物体侧的面的沿着光轴的距离设为T67，将第七透镜的沿着光轴的厚度设为CT7，将从第七透镜的像侧的面到第八透镜的物体侧的面的沿着光轴的距离设为T78，并将第八透镜的沿着光轴的厚度设为CT8时，可以满足：
T67/CT7＜0.50
T78/CT8＜0.70。
另外，在摄像光学系统中，
在将第七透镜的物体侧的面的曲率半径设为R13，将第七透镜的像侧的面的曲率半径设为R14，将第八透镜的物体侧的面的曲率半径设为R15，将第八透镜的像侧的面的曲率半径设为R16，将该第七透镜的沿着光轴的厚度设为CT7，将从第七透镜的像侧的面到第八透镜的物体侧的面的沿着光轴的距离设为T78，将第八透镜的沿着光轴的厚度设为CT8，将从第一透镜的物体侧的面到成像面的沿着光轴的距离设为TL，并将该摄像光学系统整体的焦距设为f时，可以满足：
2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5
0.6＜|R14/R15|/1.3
2.0＜TL/f＜4.0。
另外，在摄像光学系统中，
在将从第一透镜的物体侧的面中的与光轴的交点到该物体侧的面的最大有效半径位置的在光轴方向上的位移量设为Sag11，并将从第三透镜的物体侧的面中的与光轴的交点到该物体侧的面的最大有效半径位置的在光轴方向上的位移量设为Sag31时，可以满足：
|Sag11/Sag31|＜5.0。
另外，在摄像光学系统中，
在将最大像高的畸变像差量设为DST1.0，将最大像高的70％像高的畸变像差量设为DST0.7，并将最大视场角设为FOV时，可以满足：
|DST1.0/FOV|＜0.5(％/度)
|DST1.0/DST0.7|＜10。
另外，本公开的摄像光学系统，具备：
在从物体侧向像侧的方向上按顺序排列的第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜、以及第八透镜；
第一透镜具有负屈光度；
第二透镜的像侧的面是凹面；
第三透镜的像侧的面是凹面；
第四透镜的像侧的面是凸面；
第五透镜具有正屈光度，其像侧的面是凸面；
第六透镜具有负屈光度，其物体侧的面是凹面，并且像侧的面是凸面；
第七透镜具有正屈光度，其物体侧的面是中心部为凸面并且在该中心部的周边部上具有至少一个拐点的非球面；
第八透镜，其像侧的面是中心部为凹面并且在该中心部的周边部上具有至少一个拐点的非球面；
在将第一透镜的焦距设为f1，将第二透镜的焦距设为f2，将第一透镜与第二透镜的合成焦距设为f12，将第三透镜的焦距设为f3，将由第一～第八透镜构成的光学系统整体的焦距设为f，将第七透镜的沿着光轴的厚度设为CT7，将从第七透镜的像侧的面到第八透镜的物体侧的面的沿着光轴的距离设为T78，并将第八透镜的沿着光轴的厚度设为CT8时，满足：
0.3＜f/(CT7+T78+CT8)＜3.5
1.0＜CT7/CT8＜2.0
|f1/f2|＜6
|f12/f3|＜0.5。
另外，在摄像光学系统中，
第一透镜的像侧的面是凹面；
在将第七透镜的物体侧的面的曲率半径设为R13，将该第七透镜的像侧的面的曲率半径设为R14，将第八透镜的物体侧的面的曲率半径设为R15，将第八透镜的像侧的面的曲率半径设为R16，将该第七透镜的沿着光轴的厚度设为CT7，将从第七透镜的像侧的面到第八透镜的物体侧的面的沿着光轴的距离设为T78，并将第八透镜的沿着光轴的厚度设为CT8时，可以满足：
2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5
0.6＜|R14/R15|/1.3。
在摄像光学系统中，可以满足：
0.3＜|f/f12|+|f/f3|＜1.5。
另外，在摄像光学系统中，
在将第六透镜的焦距设为f6时，可以满足：
0.5＜f12/f6＜1.5。
另外，摄像光学系统具备孔径光阑；
在将从孔径光阑到第八透镜的像侧的面的沿着光轴的距离设为SD，将从第一透镜的物体侧的面到第八透镜的像侧的面的沿着光轴的距离设为TD，将第一透镜的物体侧的面的最大有效半径设为Y11，并将第八透镜的像侧的面的最大有效半径设为Y82时，可以满足：
0.45＜SD/TD＜0.65
0.8＜Y11/Y82＜1.5。
另外，在摄像光学系统中，
在将第八透镜的像侧的面的最大拐点和光轴在与该光轴正交的方向上的距离设为Yc82时，可以满足：
0.45＜Yc82/f＜0.75。
另外，在摄像光学系统中，
在将最大像高的畸变像差量设为DST1.0，将最大像高的70％像高的畸变像差量设为DST0.7，并将最大视场角设为FOV时，可以满足：
|DST1.0/FOV|＜0.5(％/度)
|DST1.0/DST0.7|＜10。
另外，本公开的摄像光学系统，具备：
在从物体侧向像侧的方向上按顺序排列的第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜、以及第八透镜；
第一透镜具有负屈光度；
第二透镜的像侧的面是凹面；
第三透镜的物体侧的面是凸面；
第四透镜的物体侧的面是凸面；
第五透镜具有正屈光度；
第六透镜具有负屈光度，其物体侧的面是凹面，并且像侧的面是凸面；
第七透镜具有正屈光度，其像侧的面是凸面；
第八透镜，其像侧的面是中心部为凹面并且在该中心部的周边部上具有至少一个拐点的非球面；
在将第一透镜的沿着光轴的厚度设为CT1，并将第八透镜的沿着光轴的厚度设为CT8时，满足：
0.5＜CT1/CT8＜1.5。
在摄像光学系统中，
在将第一透镜与第二透镜的合成焦距设为f12，并将第五透镜的焦距设为f5时，可以满足：
0.8＜|f5/f12|＜2.5。
另外，在摄像光学系统中，
在将从第一透镜的物体侧的面中的与光轴的交点到该物体侧的面的最大有效半径位置的在光轴方向上的位移量设为Sag11，并将从第三透镜的物体侧的面中的与光轴的交点到该物体侧的面的最大有效半径位置的在光轴方向上的位移量设为Sag31时，可以满足：
|Sag11/Sag31|＜5.0。
另外，在摄像光学系统中，
在将从第一透镜的像侧的面到第二透镜的物体侧的面的沿着光轴的距离设为T12，将从第二透镜的像侧的面到第三透镜的物体侧的面的沿着光轴的距离设为T23，将从第三透镜的像侧的面到第四透镜的物体侧的面的沿着光轴的距离设为T34，将从第四透镜的像侧的面到第五透镜的物体侧的面的沿着光轴的距离设为T45，将从第五透镜的像侧的面到第六透镜的物体侧的面的沿着光轴的距离设为T56，将从第六透镜的像侧的面到第七透镜的物体侧的面的沿着光轴的距离设为T67，并将从第七透镜的像侧的面到第八透镜的物体侧的面的沿着光轴的距离设为T78时，可以满足：
(T12+T23+T67+T78)/(T34+T45+T56)＜1.5。
另外，在摄像光学系统中，
在将第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜、以及第八透镜的各透镜中的折射率的最大值设为Nmax时，可以满足：
1.60＜Nmax＜1.72。
另外，本公开的光学摄像装置，具备：
上述的任一摄像光学系统；
驱动部，其驱动摄像光学系统具有的第一～第八透镜的全部或部分透镜；以及
光电转换元件，其配置于摄像光学系统的成像面。
附图说明
图1是示出本实施方式的光学摄像装置的结构的示意图。
图2是关于所述光学摄像装置所具备的光学系统中包含的第一透镜的参数Y11的概略图。
图3是用于说明所述光学系统中包含的第八透镜的参数Y82的图。
图4是用于说明所述光学系统中包含的第一透镜的参数Sag11的图。
图5是用于说明所述光学系统中包含的第三透镜的参数Sag31的图。
图6是用于说明所述光学系统中包含的第八透镜的参数Yc82的图。
图7是示出实施例1的光学摄像装置的结构的示意图。
图8是实施例1的球面像差、像散、以及畸变的像差图。
图9是示出实施例2的光学摄像装置的结构的示意图。
图10是实施例2的球面像差、像散、以及畸变的像差图。
图11是示出实施例3的光学摄像装置的结构的示意图。
图12是实施例3的球面像差、像散、以及畸变的像差图。
图13是示出实施例4的光学摄像装置的结构的示意图。
图14是实施例4的球面像差、像散、以及畸变的像差图。
图15是示出实施例5的光学摄像装置的结构的示意图。
图16是实施例5的球面像差、像散、以及畸变的像差图。
图17是示出实施例6的光学摄像装置的结构的示意图。
图18是实施例6的球面像差、像散、以及畸变的像差图。
图19是示出实施例7的光学摄像装置的结构的示意图。
图20是实施例7的球面像差、像散、以及畸变的像差图。
具体实施方式
以下参照附图对本公开的一个实施方式进行说明。
本实施方式的光学摄像装置1(以下简称为“摄像装置”。)，如图1所示，具备：摄像光学系统(以下简称为“光学系统”。)10，以及配置于光学系统10的成像面10a的光电转换元件2。具体而言，摄像装置1具备：光学系统10，其具有多个透镜11～18；传感器支架3，其保持光电转换元件2；以及驱动部4，其驱动光学系统10。本实施方式的摄像装置1还具备IR截止滤波器F，其配置在光学系统10和光电转换元件2之间。
传感器支架3保持光电转换元件2，以使得光电转换元件2位于光学系统10的成像面10a。具体而言，传感器支架3保持光电转换元件2，以使得光电转换元件2的受光面与光学系统10的光轴正交。该光电转换元件2将由入射的可见光构成的图像转换为电信号，并将其传送(输出)到未图示的后段的图像处理器等中。本实施方式的光电转换元件2是CMOS等图像传感器，可以在调整了传感器支架3或者光学系统10相对于光轴的姿势的基础上粘接固定于传感器支架3。
另外，传感器支架3上还固定有IR截止滤波器F。该IR截止滤波器F除去穿过光学系统10的光线中在图像形成上不需要的红外区域的光，并且仅使可见光区域的光穿过。具体而言，IR截止滤波器F具有如下穿透率特性：380nm到430nm的波长范围内的任一波长的光的穿透率为50％(半值)，500nm到600nm的波长范围的光的穿透率为80％以上，730nm到800nm的波长范围的光的穿透率为10％以下。该IR截止滤波器F通过在红外吸收玻璃底座的表面附加作为交替层叠TiO2膜和SiO2膜的多层结构的多层涂层而形成。由于该IR截止滤波器F的两侧的面为大致平面，因此即使配置于光学系统10与光电转换元件2之间，也不会影响光线的成像。
另外，IR截止滤波器也可以是对通常的透明玻璃平板(肖特公司制造的D263Teco等)涂敷红外吸收墨水，并从其上部施加防反射用的AR涂层。利用该IR截止滤波器也能够实现与上述IR截止滤波器F相同的穿透率特性。
驱动部4是VCM(音圈马达)等驱动器，其在与光电转换元件2的受光面大致垂直的方向(光轴方向)上驱动光学系统10。
光学系统10具有：透镜组，其包括多个透镜；孔径光阑5，其配置于透镜之间；以及透镜保持部件(镜筒)6，其保持透镜组。另外，光学系统10具有：遮光部件7，其配置于物体侧(入光侧)的端部；至少一个遮光片8，其配置于透镜之间；以及透镜压紧环9，其相对于透镜保持部件6推压透镜组。
透镜组包括在从物体侧向像侧的方向上按顺序排列的第一透镜11、第二透镜12、第三透镜13、第四透镜14、第五透镜15、第六透镜16、第七透镜17、以及第八透镜18。本实施方式的透镜组中的透镜总数是八片，第四～第六透镜14～16构成确定光学系统10的成像性能的主透镜组。
这些第一～第七透镜11～17的各透镜在周边部具有使用斜面的叠层结构。在这些各透镜11～17被透镜保持部件6保持时，通过相邻的透镜彼此使这些叠层结构嵌合，能够将各透镜11～17高精度地配置在配置位置。即，能够高精度地得出透镜位置精度。另外，第七透镜17与第八透镜18之间具备遮光兼间隔调整垫片8a，其具有切断不需要干扰光的功能，用于调整像面弯曲。在实际的批量生产中，由于各种公差误差，会产生由像面弯曲量的恶化而引起的画质劣化。为了修正该像面弯曲，通过改变遮光兼间隔调整垫片8a的厚度来调整第七透镜17与第八透镜18在光轴方向上的间隔，能够消除产生的像面弯曲。另外，这些第一～第八透镜11～18的详细内容将在后面描述。
透镜保持部件6是筒状的部件，其在内部保持第一～第八透镜11～18。具体而言，透镜保持部件6保持从物体侧向像侧按顺序排列的第一透镜11、遮光片8、第二透镜12、遮光片8、第三透镜13、孔径光阑5、第四透镜14、遮光片8、第五透镜15、遮光片8、第六透镜16、遮光片8、第七透镜17、遮光兼间隔调整垫片8a、以及第八透镜18。在本实施方式的透镜保持部件6中，在这些第一～第八透镜11～18、多个遮光片8以及遮光兼间隔调整垫片8a按上述顺序插入到内部的状态下，透镜压紧环9以适当的压力抑制这些部件，并且利用UV硬化树脂等粘接剂将其固定在透镜保持部件6上。
配置于第三透镜13与第四透镜14之间的孔径光阑5具有确定光学系统10整体的光圈值的作用。另外，遮光部件7安装于筒状的透镜保持部件6的前面(物体侧)的开口部分，由此，限制图像周边部分的不需要的光线侵入光学系统10。
遮光片8通过设置于透镜之间的周边部分，起到除去不需要的光线(即遮挡干扰光)的作用，该不需要的光线来自在透镜有效部的外侧的结构内部中的反射。由此，提高了由摄像装置1摄像的图像等的质量。光学系统10具有至少一个遮光片8。本实施方式的光学系统10具有多个(图1所示的例中为五个)非常薄的遮光片8。具体而言，遮光片8分别配置于第一透镜11与第二透镜12之间、第二透镜12与第三透镜13之间、第四透镜14与第五透镜15之间、第五透镜15与第六透镜16之间、以及第六透镜16与第七透镜17之间。
接着，对各透镜11～18进行详细说明。
第一透镜11和第二透镜12分别具有负屈光度。通过这些第一透镜11和第二透镜12合计具有四个透镜界面11a、11b、12a以及12b，在光学系统10(摄像装置1)中，确保了130度以上的视角，并且得到了所希望的畸变像差形状。假设在第一透镜11和第二透镜12由一片具有负屈光度的透镜构成的情况下，由于透镜界面只有两面，因此难以得到与入射到光学系统10的光线视场角对应的所希望的畸变像差。
第一透镜11的物体侧的面(透镜界面)11a是专门用于调整视野角的面。在本实施方式的光学系统10中，产生的畸变像差的平衡由比第一透镜11的物体侧的面11a更靠近像侧的面(透镜界面)分担。
另外，第一透镜11和第二透镜12的像侧的面11b、12b分别为凹面(向物体侧凹陷的面)。由此，通过相对于各入射角度调整在各像侧的面11b、12b产生的负畸变像差，能够在实现光学系统10的小型化的同时，调整立体的被摄体的变形(透视畸变)。
第二透镜12的物体侧的面12a能够根据第一透镜11与第二透镜12的间隔调整产生的像差。具体而言，在第一透镜11和第二透镜12分别由具有负屈光度的透镜构成的情况下，光学系统10(摄像装置1)整体变大，但是通过使第二透镜12的物体侧的面12a的形状具有自由度，即使第一透镜11与第二透镜12的间隔小，也能够抑制像差的产生。
第三透镜13具有正屈光度。第三透镜13的物体侧的面13a是凸面，第三透镜13的像侧的面13b是凹面。该第三透镜13通过在光学系统10中汇聚透过第一透镜11和第二透镜12的大范围的视场角的光线，来辅助光学系统10(摄像装置1)的小型化。
通过使该第三透镜13的物体侧的面13a为凸面，在光学系统10中，容易接收大范围的视场角的光线。另外，在第三透镜13的像侧的面13b反射的光线在物体侧的面13a上逆行时，可能发生全反射，但是通过使第三透镜13的物体侧的面13a为凸面，能够除去该不需要的全反射光线。
另外，通过使第三透镜13的像侧的面13b为凹面，在光学系统10中，得到第四透镜14之后的透镜组的像差修正能力与光学系统10整体的像差修正能力的适宜的平衡，结果是，能够提高光学系统10中的成像质量，并且使摄像更加鲜明。
第四透镜14具有正屈光度。第四透镜14的物体侧的面14a是凸面，第四透镜14的像侧的面14b是凸面。该第四透镜14为了避免因该第四透镜14的表面曲率过大而引起的过多的像差或者杂散光，与第五透镜15分担正屈光度。另外，通过使第四透镜14的像侧的面14b为凸面，在第四透镜14中，抑制了像差的产生，并且提高了光学系统10中的对称性。
第五透镜15具有正屈光度。第五透镜15的物体侧的面15a是凹面，第五透镜15的像侧的面15b是凸面。该第五透镜15与第四透镜14协同确保充分的集光能力。另外，通过使第五透镜15的像侧的 面15b为凸面，在光学系统10的视场角范围的周边部分中得到了充分的集光能力，结果是，容易确保大视场角范围的光学系统10中的周围光量。
第六透镜16具有负屈光度。第六透镜16的物体侧的面16a是凹面，第六透镜16的像侧的面是凸面。该第六透镜16通过由高分散性材料构成，尤其良好地修正了像高高的部分的色差(Lateral Chromatic Aberration)。另外，在第六透镜16中，通过使物体侧的面16a为凹面，并且使像侧的面16b为凸面，第六透镜16成为对像散等非轴像差有利的结构。
第七透镜17具有正屈光度。第七透镜17的物体侧的面17a的中心部(中心附近)171a是凸面，像侧的面17b是凸面。另外，物体侧的面17a是在中心部171a的周边部172a上具有至少一个拐点的非球面。该第七透镜17与第八透镜18协同调整像散。
第八透镜18具有负屈光度。第八透镜18的物体侧的面18a是凹面，像侧的面18b的中心部(中心附近)181b是凹面。另外，像侧的面18b是在中心部181b的周边部182b上具有至少一个拐点的非球面(参照图3)。该第八透镜18与第七透镜17协同调整像散。
根据这些第七透镜17和第八透镜18，通过由第七透镜17和第八透镜18两片透镜分担像散的调整，使各透镜的形状容易均匀地成形，由此，使得第七透镜17以及第八透镜18的成形性良好。另外，由于能够利用构成于第七透镜17的像侧的面17b与第八透镜18的物体侧的面18a之间的空气透镜调整像面弯曲像差以及畸变像差，因此得到更加鲜明的图像。
而且，通过使第八透镜18的像侧的面18b为如上所述的非球面，能够优化从该第七透镜17到达光电转换元件2的光线的角度(CRA)。而且，通过调整在第八透镜18中产生的畸变像差、以及在第一透镜11和第二透镜12中产生的畸变像差，能够优化摄像装置1的后焦距，并且将摄像装置1整体小型化。
另外，在该光学系统10中，通过将孔径光阑5设置在第三透镜13与第四透镜14之间，能够提高光学系统10中的对称性。
另外，在该光学系统10中，在将第一透镜11的焦距设为f1，并将第二透镜12的焦距设为f2时，优选满足：
|f1/f2|＜6。
在该条件下，通过第一透镜11与第二透镜12分担负屈光度，实现视野角的扩大和畸变像差量的产生量的优化。而且，能够使尺寸大的第一透镜11的形状平滑，由此，提高第一透镜11的生产率。
另外，在该光学系统10中，在将第一透镜11与第二透镜12的合成焦距设为f12，并将第三透镜13的焦距设为f3时，优选满足：
|f12/f3|＜0.5；
更优选满足：
|f12/f3|＜0.3。
通过满足该条件，能够充分增大由第一透镜11和第二透镜12两个透镜得到的负屈光度，由此，在光学系统10中得到充分的视野角度(FOV)。
另外，在该光学系统10中，在将从第三透镜13的像侧的面13b到第四透镜14的物体侧的面14a的沿着光轴的距离设为T34，并将从第六透镜16的像侧的面16b到第七透镜17的物体侧的面17a的沿着光轴的距离设为T67时，优选满足：
0＜T67/T34＜1.0；
更优选满足：
0＜T67/T34＜0.6。
通过满足该条件，优化了光学系统10中的空间配置，并且提高了像面弯曲像差的修正能力，由此，直到图像周边部都能获取到鲜明的图像。
另外，在该光学系统10中，在将光学系统10整体的焦距设为f，将第七透镜17的沿着光轴的厚度设为CT7，将从第七透镜的像侧的面到第八透镜的物体侧的面的沿着光轴的距离设为T78，并将第八透镜的沿着光轴的厚度设为CT8时，优选满足：
0.3＜f/(CT7+T78+CT8)＜3.5
1.0＜CT7/CT8＜2.0；
更优选满足：
0.8＜f/(CT7+T78+CT8)＜3.2
1.2＜CT7/CT8＜1.8；
更优选满足：
1.5＜f/(CT7+T78+CT8)＜2.8
1.4＜CT7/CT8＜1.6。
在该条件下，通过优化第七透镜17和第八透镜18的形状，能够有效地抑制像散。另外，还提高了批量生产中的成形性。
另外，在该光学系统10中，在将第一透镜11的沿着光轴的厚度设为CT1，并将第八透镜18的沿着光轴的厚度设为CT8时，优选满足：
0.5＜CT1/CT8＜1.5。
通过满足该条件，由于优化了光学系统10的最物体侧的透镜(第一透镜11)和最像侧的透镜(第八透镜18)的厚度，因此降低了像散，由此，提高了摄像装置1的稳定性。
另外，在该光学系统10中，在将从第一透镜11的物体侧的面11a到成像面10a的沿着光轴的距离设为TL，并将光学系统10的最大像高设为ImgH时，优选满足：
TL/ImgH＜3；
更优选满足：
1.8＜TL/ImgH＜2.6。
通过满足该条件，达成了光学系统10(摄像装置1)的小型化。另外，在得到广角的摄像范围的同时，通过增加周边光束，提高了图像质量。
另外，在该光学系统10中，在将第四透镜14的物体侧的面14a的曲率半径设为R7，并将第四透镜14的像侧的面14b的曲率半径设为R8时，优选满足：
0＜(R7+R8)/(R7-R8)＜1.0；
更优选满足：
0＜(R7+R8)/(R7-R8)＜0.5。
在该条件下，通过优化第四透镜14的曲率半径，得到光学系统10整体的形状对称性，由此，降低了球面像差的产生，结果是，提高了图像质量。
另外，在该光学系统10中，在将从第一透镜11的像侧的面11b到第二透镜12的物体侧的面12a的沿着光轴的距离设为T12，将从第二透镜12的像侧的面12b到第三透镜13的物体侧的面13a的沿着光轴的距离设为T23，并将第三透镜13的像侧的面13b到第四透镜14的物体侧的面14a的沿着光轴的距离设为T34时，优选满足：
0＜T12/T23＜3.0，以及，0＜T23/T34＜2.0；
更优选满足：
0.8＜T12/T23＜2.2，以及，0.5＜T23/T34＜1.2。
在该条件下，通过分别优化从第一透镜11的像侧的面11b到第二透镜12的物体侧的面12a的沿着光轴的距离，以及从第二透镜12的像侧的面12b到第三透镜13的物体侧的面13a的沿着光轴的距离，能够分别减小第一透镜11和第二透镜12的各透镜的有效半径，由此，能够实现光学系统10的尺寸的优化。
另外，在该光学系统10中，在将最大视场角的二分之一设为HFOV时，优选满足：
2.0＜tan(HFOV)；
更优选满足：
3.0＜tan(HFOV)。
通过满足该条件，在光学系统10中得到作为广角透镜的特征的宽阔的撮影(摄像)范围。
另外，在该光学系统10中，在将光圈值设为Fno时，优选满足：
1.4＜Fno＜3.0。
在该条件下，通过优化入射到光电转换元件2中的光量，能够在限制由多余光量引起的干扰光的同时，得到充分的光量。
另外，在光学系统10中，优选满足：
2.4＜Fno＜3.0。
通过满足该条件，能够加深景深，由此，由于能够废除在光轴方向上驱动透镜的结构(驱动部4)，因此能够将光电转换元件2固定在光学系统10上。
另外，在光学系统10中，如图2和图3所示，在将第一透镜11的物体侧的面11a的最大有效半径设为Y11，并将第八透镜的像侧的面18b的最大有效半径设为Y82时，优选满足：
0.8＜Y11/Y82＜1.5；
更优选满足：
0.9＜Y11/Y82＜1.3。
通过满足该条件，能够抑制光学系统10中的物体侧的部位和像侧的部位的大小的不均匀性，并达 成光学系统10整体的小型化。另外，在超过(低于)上述关系式的下限值时，由于物体侧的面18a的非球面形状的变曲度增大，因此成形性容易恶化，进而导致畸变像差的劣化，以及周围光量的降低。另一方面，在超过(高于)上述关系式的上限值时，光学系统10会变得过大。
另外，在光学系统10中，在将第六透镜16的色散系数设为V6，并将第七透镜17的色散系数设为V7时，优选满足：
0＜V6/V7＜0.50。
通过满足该条件，能够降低光学系统10的倍率色差，由此，能够降低合成三色或四色彩色图像传感器信号时的图像信号的偏移。
另外，在光学系统10中，在将光学系统10整体的焦距设为f，将第四透镜14的焦距设为f4，并将第五透镜15的焦距设为f5时，优选满足：
0＜(f/f4)-(f/f5)＜2.0；
更优选满足：
0.3＜(f/f4)-(f/f5)＜1.0。
在该条件下，通过抑制第四透镜14和第五透镜15的屈光度的差，能够抑制彗形像差的增大。
另外，在光学系统10中，在将从第六透镜16的像侧的面16b到第七透镜17的物体侧的面17a的沿着光轴的距离设为T67，将第七透镜17的沿着光轴的厚度设为CT7，将从第七透镜17的像侧的面17b到第八透镜18的物体侧的面18a的沿着光轴的距离设为T78，并将第八透镜18的沿着光轴的厚度设为CT8时，优选满足：
T67/CT7＜0.50
T78/CT8＜0.70；
更优选满足：
T67/CT7＜0.30
T78/CT8＜0.40。
通过满足该条件，由于能够适当地利用光学系统10的像侧的空间，因此能够将配置于像侧的第七透镜17以及第八透镜18小型化。
另外，在光学系统10中，在将第七透镜17的物体侧的面17a的曲率半径设为R13，将第八透镜18的像侧的面18b的曲率半径设为R16，将第七透镜17的沿着光轴的厚度(中心厚度)设为CT7，将从第七透镜的像侧的面到第八透镜的物体侧的面的沿着光轴的距离设为T78，并将第八透镜的沿着光轴的厚度设为CT8时，优选满足：
2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5。
在该条件下，通过优化第七透镜17与第八透镜18的合成形状，能够优化由第七透镜17以及第八透镜18引起的像散以及像面弯曲的修正能力。
另外，在光学系统10中，在将第七透镜17的像侧的面17b的曲率半径设为R14，并将第八透镜18的物体侧的面18a的曲率半径设为R15时，优选满足：
0.6＜|R14/R15|/1.3
在该条件下，通过优化第七透镜17与第八透镜18之间的空气透镜形状，能够优化第七透镜17以及第八透镜18的特别是周缘部中的像散和像面弯曲的修正能力。
另外，在光学系统10中，在将从第一透镜11的物体侧的面11a到成像面10a的沿着光轴的距离设为TL，并将光学系统10整体的焦距设为f时，优选满足：
2.0＜TL/f＜4.0。
通过满足该条件，能够在实现光学系统10的大小和广角特性的最佳兼顾的同时，实现光学系统10在光轴方向上的薄型化。
另外，在光学系统10中，如图4和图5所示，在将从第一透镜11的物体侧的面11a中的与光轴的交点到物体侧的面11a的最大有效半径位置的在光轴方向上的位移量设为Sag11，并将从第三透镜13的物体侧的面13a中的与光轴的交点到物体侧的面13a的最大有效半径位置的在光轴方向上的位移量设为Sag31时，优选满足：
|Sag11/Sag31|＜5.0；
更优选满足：
|Sag11/Sag31|＜3.0；
更优选满足：
|Sag11/Sag31|＜2.0。
在该条件下，通过优化光学系统10的物体侧的透镜开口的大小，能够减轻透镜镜筒结构上的负担。
另外，在光学系统10中，在将最大像高的畸变像差量设为DST1.0，将最大像高的70％像高的畸变像差量设为DST0.7，并将最大视场角设为FOV时，优选满足：
|DST1.0/FOV|＜0.5(％/度)；
以及，|DST1.0/DST0.7|＜10。
通过满足该条件，能够在抑制图像周边部分的光量的降低的同时，抑制立体物的被摄体的变形(透视畸变)，这往往是广角透镜的问题。
另外，在光学系统10中，在将光学系统10整体的焦距设为f，将第一透镜11与第二透镜12的合成焦距设为f12，并将第三透镜13的焦距设为f3时，优选满足：
0.3＜|f/f12|+|f/f3|＜1.5；
更优选满足：
0.5＜|f/f12|+|f/f3|＜1.3；
更优选满足：
0.7＜|f/f12|+|f/f3|＜1.1。
通过满足该条件，在光学系统10的物体侧得到充分的屈光度，由此，能够确保大的视野角。
另外，在光学系统10中，在将第一透镜11与第二透镜12的合成焦距设为f12，并将第六透镜的焦距设为f6时，优选满足：
0.5＜f12/f6＜1.5。
在该条件下，通过优化光学系统10的物体侧和像侧中的负屈光度的分配，得到小型的广角透镜(光学系统10)。
另外，在光学系统10中，在将从孔径光阑5到第八透镜18的像侧的面18b的沿着光轴的距离设为SD，并将从第一透镜11的物体侧的面11a到第八透镜18的像侧的面18b的沿着光轴的距离设为TD时，优选满足：
0.45＜SD/TD＜0.65。
通过满足该条件，能够增大占据光学系统10整体的光线的穿过范围，由此，能够将光学系统10小型化，并且使光学性能最佳。
另外，在光学系统10中，如图6所示，在将第八透镜18的像侧的面18b的最大拐点和光轴在与该光轴正交的方向上的距离设为Yc82，并将光学系统10整体的焦距设为f时，优选满足：
0.45＜Yc82/f＜0.75。
通过满足该条件，能够适当地设定入射到光电转换元件2中的光线入射角度，进而能够抑制像散的产生。
另外，在光学系统10中，在将第一透镜11与第二透镜12的合成焦距设为f12，并将第五透镜15的焦距设为f5时，优选满足：
0.8＜|f5/f12|＜2.5；
更优选满足：
1.0＜|f5/f12|＜2.0。
在该条件下，通过使第一透镜11和第二透镜12的弯曲力(负成分)和第五透镜15的弯曲力(正成分)的分配适当，能够提高图像质量。
另外，在光学系统10中，在将从第一透镜11的像侧的面11b到第二透镜12的物体侧的面12a的沿着光轴的距离设为T12，将从第二透镜12的像侧的面12b到第三透镜13的物体侧的面13a的沿着光轴的距离设为T23，将从第三透镜的像侧的面13b到第四透镜的物体侧的面14a的沿着光轴的距离设为T34，将从第四透镜14的像侧的面14b到第五透镜15的物体侧的面15a的沿着光轴的距离设为T45，将从第五透镜15的像侧的面15b到第六透镜16的物体侧的面16a的沿着光轴的距离设为T56，将从第六透镜16的像侧的面16b到第七透镜17的物体侧的面17a的沿着光轴的距离设为T67，并将从第七透镜17的像侧的面17b到第八透镜18的物体侧的面18a的沿着光轴的距离设为T78时，优选满足：
(T12+T23+T67+T78)/(T34+T45+T56)＜1.5。
通过满足该条件，能够对在视场角范围的设定、像面弯曲像差的降低以及适当的畸变像差的设定这三个方面占主导地位的T12+T23+T67+T78的间隔，以及在左右成像性能的球面像差以及彗形像差的降低方面占主导地位的T34+T45+T56的间隔这二者进行有效的修正。
另外，在光学系统10中，在将第一透镜11、第二透镜12、第三透镜13、第四透镜14、第五透镜15、第六透镜16、第七透镜17、以及第八透镜18的各透镜中的折射率最大值设为Nmax时，优选满足：
1.60＜Nmax＜1.72。
通过满足该条件，能够取得光学系统10整体的透镜的平衡，并且能够在降低像差的同时实现容易 成形的透镜形状。
以上的光学系统10具有的各透镜11～18的材质可以是塑料，也可以是玻璃。在透镜的材质为塑料时，由于材料费便宜，加工性优良，并且加工时间也短，因此能够降低生产成本。另外，在透镜的材质为玻璃时，由于通常与塑料相比折射率高，因此提高了透镜的设计自由度，并且能够实现更高精细或者更小型化。
另外，光学系统10的各透镜11～18的物体侧的面11a～18a以及像侧的面11b～18b优选与球面相比自由度飞跃性大的非球面。由此，能够降低像差，高精细化摄像图像，或者将光学系统10整体小型化。
根据以上的光学系统10以及具备该光学系统10的摄像装置1，尽管是小型的但仍能保持充分的成像性能，并且能够得到大的视场角。关于该视场角，以往为120度左右的广角透镜的视场角，例如，大幅扩大到150度左右。详情如下。
利用第一透镜11和第二透镜12分别为凹透镜并且第三透镜13为凸透镜的结构(三片凹凹凸结构)，在光学系统10中，能够实现超广角范围的光线的入射(广角转换器)，并且即使在全视场角为150度左右也能够确保所希望的畸变像差。
而且，在光学系统10中，第四～第六透镜14～16构成确定光学系统10(透镜)的成像性能的主透镜组。并且，通过使第四透镜14为凸透镜，第五透镜15为凸透镜，第六透镜16为凹透镜，并且使各透镜14、15、16的像侧的面14b、15b、16b相对于光电转换元件2为凸面，来良好地修正光学系统10中的球面像差以及彗形像差。
另外，在第六透镜16由高分散性材料形成的情况下，能够尤其良好地修正像高高的部分的色差(Lateral Chromatic Aberration)。另外，在第六透镜16中，通过使物体侧的面16a为凹面，像侧的面16b为凸面，第六透镜16成为对像散等非轴像差有利的结构。
另外，通过使第七透镜17为凸透镜，并使第八透镜18为凹透镜，构成为第七透镜17和第八透镜18协同调整像散。根据这些第七透镜17和第八透镜18，通过由第七透镜17和第八透镜18两片透镜分担像散的调整，使各透镜的形状容易均匀地成形，由此，使得第七透镜17以及第八透镜18的成形性良好。另外，由于能够利用构成于第七透镜17的像侧的面17b与第八透镜18的物体侧的面18a之间的空气透镜调整像面弯曲像差以及畸变像差，因此得到更加鲜明的图像。
而且，通过使第八透镜18的像侧的面18b(详细的说是中心部181b)为凹面，能够优化从该第七透镜17到达光电转换元件2的光线的角度(CRA)。而且，通过调整在第八透镜18中产生的畸变像差、以及在第一透镜11和第二透镜12中产生的畸变像差，能够优化摄像装置1的后焦距，并且将摄像装置1整体小型化。
另外，在本实施方式的光学系统10以及摄像装置1中，由于能够实现与装载于动作特写(例：产品名称GoPro(注册商标))的摄像装置相同的视场角规格，并且能够装载于移动终端的尺寸，因此通过最近的5G环境的扩大，能够从移动终端实时传输与动作特写相同的超广角影像，并且能够实现移动终端的利用用途的扩大。
接着，对本公开的光学摄像装置的实施例1～7进行说明，首先，对共同的结构进行说明，之后，对各实施例的结构进行说明。
[共同的结构]
各实施例的光学摄像装置的基本结构与上述实施方式的光学摄像装置1相同。具体而言，各实施例的光学摄像装置具备光学系统、驱动部、IR截止滤波器、以及光电转换元件。
光学系统具有八片透镜。具体而言，光学系统具有在从物体侧向像侧的方向上按顺序排列的第一透镜、第二透镜、第三透镜、孔径光阑、第四透镜、第五透镜、第六透镜、第七透镜、以及第八透镜。各实施例的光学系统通过IR截止滤波器，将物体侧的被摄体信息(来自物体侧的光)成像在作为成像表面的光电转换元件的表面(受光面)上。
[实施例1]
图7是本实施例1的光学摄像装置1的示意图，图8是按从左到右的顺序示出实施例1的光学系统10中的球面像差、像散、以及畸变(畸变像差)的像差图。
在本实施例1的光学系统10中：
第一透镜11具有负屈光度，由塑料材料形成。在第一透镜11中，物体侧的面11a是凸面，像侧的面11b是凹面。该第一透镜11的物体侧的面11a和像侧的面11b均是非球面。
第二透镜12具有负屈光度，由塑料材料形成。在第二透镜12中，物体侧的面12a是凹面，像侧的面12b是凹面。该第二透镜12的物体侧的面12a和像侧的面12b均是非球面。
第三透镜13具有正屈光度，由塑料材料形成。在第三透镜13中，物体侧的面13a是凸面，像侧的 面13b是凹面。该第三透镜13的物体侧的面13a和像侧的面13b均是非球面。
第四透镜14具有正屈光度，由塑料材料形成。在第四透镜14中，物体侧的面14a是凸面，像侧的面14b是凸面。该第四透镜14的物体侧的面14a和像侧的面14b均是非球面。
第五透镜15具有正屈光度，由塑料材料形成。在第五透镜15中，物体侧的面15a是凹面，像侧的面15b是凸面。该第五透镜15的物体侧的面15a和像侧的面15b均是非球面。
第六透镜16具有负屈光度，由塑料材料形成。在第六透镜16中，物体侧的面16a是凹面，像侧的面16b是凸面。该第六透镜16的物体侧的面16a和像侧的面16b均是非球面。
第七透镜17具有正屈光度，由塑料材料形成。在第七透镜17中，物体侧的面17a是凸面，像侧的面17b是凸面。该第七透镜17的物体侧的面17a和像侧的面17b均是非球面。
第八透镜18具有负屈光度，由塑料材料形成。在第八透镜18中，物体侧的面18a是凹面，像侧的面18b是凹面。该第八透镜18的物体侧的面18a和像侧的面18b均是非球面。
本实施例1的光学系统10具有的各透镜11～18的非球面公式如下所示。
公式1
Figure PCTCN2021079394-appb-000001
另外，在求本实施例1的表中的值时，将公式(1)的15次以上(n≥15)的项作为0来计算。
另外，在下述表1中对透镜的结构列举了实际的数值，在表2中对各透镜面的非球面系数列举了实际的数值，在表3中对本公开的条件式列举了实际的数值。
表1
Figure PCTCN2021079394-appb-000002
Figure PCTCN2021079394-appb-000003
表2
Figure PCTCN2021079394-appb-000004
表3
Figure PCTCN2021079394-appb-000005
表3的各数值是否满足本公开的各条件式如下所示。
·表3的|f1/f2|＝1.713满足|f1/f2|＜6。
·表3的|f12/f3|＝0.201满足|f12/f3|＜0.5。
·表3的T67/T34＝0.328满足0＜T67/T34＜1.0。
·表3的TL/ImgH＝2.556满足TL/ImgH＜3。
·表3的(R7+R8)/(R7-R8)＝0.379满足0＜(R7+R8)/(R7-R8)＜1.0。
·表3的T12/T23＝1.774满足0＜T12/T23＜3.0。
·表3的T23/T34＝0.871满足0＜T23/T34＜2.0。
·表3的tan(HFOV)＝2.228满足2.0＜tan(HFOV)。
·表3的Fno＝2.80满足1.4＜Fno＜3.0。
·表3的Y11/Y82＝1.066满足0.8＜Y11/Y82＜1.5。
·表3的V6/V7＝0.329满足0＜V6/V7＜0.50。
·表3的(f/f4)-(f/f5)＝0.750满足0＜(f/f4)-(f/f5)＜2.0。
·表3的T67/CT7＝0.214满足T67/CT7＜0.50。
·表3的T78/CT8＝0.257满足T78/CT8＜0.70。
·表3的(|R13|+|R16|)/(CT7+T78+CT8)＝3.900满足
2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5。
·表3的|R14/R15|＝1.045满足0.6＜|R14/R15|＜1.3。
·表3的TL/f＝3.166满足2.0＜TL/f＜4.0。
·表3的|Sag11/Sag31|＝0.277满足|Sag11/Sag31|＜5.0。
·表3的|DST1.0/FOV|＝0.337满足|DST1.0/FOV|＜0.5。
·表3的|DST1.0/DST0.7|＝2.173满足|DST1.0/DST0.7|＜10。
·表3的f/(CT7+T78+CT8)7＝2.049满足0.3＜f/(CT7+T78+CT8)＜3.5。
·表3的CT7/CT8＝1.500满足1.0＜CT7/CT8＜2.0。
·表3的|f/f12|+|f/f3|＝0.973满足0.3＜|f/f12|+|f/f3|＜1.5。
·表3的f12/f6＝0.953满足0.5＜f12/f6＜1.5。
·表3的SD/TD＝0.558满足0.45＜SD/TD＜0.65。
·表3的YC82/f＝0.524满足0.45＜YC82/f＜0.75。
·表3的CT1/CT8＝1.125满足0.5＜CT1/CT8＜1.5。
·表3的|f5/f12|＝1.749满足0.8＜|f5/f12|＜2.5。
·表3的(T12+T23+T67+T78)/(T34+T45+T56)＝1.097满足
(T12+T23+T67+T78)/(T34+T45+T56)＜1.5。
·表3的Nmax＝1.680满足1.60＜Nmax＜1.72。
如上，能够确认关于实施例1的光学系统10的表3的各数值满足本公开各条件式。
[实施例2]
图9是本实施例2的光学摄像装置1的示意图，图10是按从左到右的顺序示出实施例2的光学系统20中的球面像差、像散、以及畸变(畸变像差)的像差图。
在本实施例2的光学系统20中：
第一透镜21具有负屈光度，由塑料材料形成。在第一透镜21中，物体侧的面21a是凹面，像侧的面21b是凹面。该第一透镜21的物体侧的面21a和像侧的面21b均是非球面。
第二透镜22具有负屈光度，由塑料材料形成。在第二透镜22中，物体侧的面22a是凹面，像侧的面22b是凹面。该第二透镜22的物体侧的面22a和像侧的面22b均是非球面。
第三透镜23具有正屈光度，由塑料材料形成。在第三透镜23中，物体侧的面23a是凸面，像侧的面23b是凹面。该第三透镜23的物体侧的面23a和像侧的面23b均是非球面。
第四透镜24具有正屈光度，由塑料材料形成。在第四透镜24中，物体侧的面24a是凸面，像侧的面24b是凸面。该第四透镜24的物体侧的面24a和像侧的面24b均是非球面。
第五透镜25具有正屈光度，由塑料材料形成。在第五透镜25中，物体侧的面25a是凹面，像侧的面25b是凸面。该第五透镜25的物体侧的面25a和像侧的面25b均是非球面。
第六透镜26具有负屈光度，由塑料材料形成。在第六透镜26中，物体侧的面26a是凹面，像侧的面26b是凸面。该第六透镜26的物体侧的面26a和像侧的面26b均是非球面。
第七透镜27具有正屈光度，由塑料材料形成。在第七透镜27中，物体侧的面27a是凸面，像侧的面27b是凸面。该第七透镜27的物体侧的面27a和像侧的面27b均是非球面。
第八透镜28具有负屈光度，由塑料材料形成。在第八透镜28中，物体侧的面28a是凹面，像侧的面28b是凹面。该第八透镜28的物体侧的面28a和像侧的面28b均是非球面。
本实施例2的光学系统20具有的各透镜21～28的非球面公式与实施例1的公式(1)相同。另外，在本实施例2中，在求表中的值时，也将公式(1)的15次以上(n≥15)的项作为0来计算。
另外，在下述表4中对透镜的结构列举了实际的数值，在表5中对各透镜面的非球面系数列举了实际的数值，在表6中对本公开的条件式列举了实际的数值。
表4
Figure PCTCN2021079394-appb-000006
Figure PCTCN2021079394-appb-000007
表5
Figure PCTCN2021079394-appb-000008
表6
Figure PCTCN2021079394-appb-000009
表6的各数值是否满足本公开的各条件式如下所示。
·表6的|f1/f2|＝2.473满足|f1/f2|＜6。
·表6的|f12/f3|＝0.167满足|f12/f3|＜0.5。
·表6的T67/T34＝0.331满足0＜T67/T34＜1.0。
·表6的TL/ImgH＝2.195满足TL/ImgH＜3。
·表6的(R7+R8)/(R7-R8)＝0.367满足0＜(R7+R8)/(R7-R8)＜1.0。
·表6的T12/T23＝1.391满足0＜T12/T23＜3.0。
·表6的T23/T34＝0.951满足0＜T23/T34＜2.0。
·表6的tan(HFOV)＝3.723满足2.0＜tan(HFOV)。
·表6的Fno＝2.80满足1.4＜Fno＜3.0。
·表6的Y11/Y82＝1.042满足0.8＜Y11/Y82＜1.5。
·表6的V6/V7＝0.329满足0＜V6/V7＜0.50。
·表6的(f/f4)-(f/f5)＝0.637满足0＜(f/f4)-(f/f5)＜2.0。
·表6的T67/CT7＝0.200满足T67/CT7＜0.50。
·表6的T78/CT8＝0.238满足T78/CT8＜0.70。
·表6的(|R13|+|R16|)/(CT7+T78+CT8)＝3.522满足
2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5。
·表6的|R14/R15|＝0.839满足0.6＜|R14/R15|＜1.3。
·表6的TL/f＝3.010满足2.0＜TL/f＜4.0。
·表6的|Sag11/Sag31|＝0.216满足|Sag11/Sag31|＜5.0。
·表6的|DST1.0/FOV|＝0.422满足|DST1.0/FOV|＜0.5。
·表6的|DST1.0/DST0.7|＝4.125满足|DST1.0/DST0.7|＜10。
·表6的f/(CT7+T78+CT8)7＝2.126满足0.3＜f/(CT7+T78+CT8)＜3.5。
·表6的CT7/CT8＝1.531满足1.0＜CT7/CT8＜2.0。
·表6的|f/f12|+|f/f3|＝0.920满足0.3＜|f/f12|+|f/f3|＜1.5。
·表6的f12/f6＝0.982满足0.5＜f12/f6＜1.5。
·表6的SD/TD＝0.569满足0.45＜SD/TD＜0.65。
·表6的YC82/f＝0.610满足0.45＜YC82/f＜0.75。
·表6的CT1/CT8＝1.200满足0.5＜CT1/CT8＜1.5。
·表6的|f5/f12|＝1.410满足0.8＜|f5/f12|＜2.5。
·表6的(T12+T23+T67+T78)/(T34+T45+T56)＝1.012满足
(T12+T23+T67+T78)/(T34+T45+T56)＜1.5。
·表6的Nmax＝1.680满足1.60＜Nmax＜1.72。
如上，能够确认关于实施例2的光学系统20的表6的各数值满足本公开各条件式。
[实施例3]
图11是本实施例3的光学摄像装置1的示意图，图12是按从左到右的顺序示出实施例3的光学系统30中的球面像差、像散、以及畸变(畸变像差)的像差图。
在本实施例3的光学系统30中：
第一透镜31具有负屈光度，由塑料材料形成。在第一透镜31中，物体侧的面31a是凸面，像侧的面31b是凹面。该第一透镜31的物体侧的面31a和像侧的面31b均是非球面。
第二透镜32具有负屈光度，由塑料材料形成。在第二透镜32中，物体侧的面32a是凸面，像侧的面32b是凹面。该第二透镜32的物体侧的面32a和像侧的面32b均是非球面。
第三透镜33具有正屈光度，由塑料材料形成。在第三透镜33中，物体侧的面33a是凸面，像侧的面33b是凹面。该第三透镜33的物体侧的面33a和像侧的面33b均是非球面。
第四透镜34具有正屈光度，由塑料材料形成。在第四透镜34中，物体侧的面34a是凸面，像侧的面34b是凸面。该第四透镜34的物体侧的面34a和像侧的面34b均是非球面。
第五透镜35具有正屈光度，由塑料材料形成。在第五透镜35中，物体侧的面35a是凹面，像侧的面35b是凸面。该第五透镜35的物体侧的面35a和像侧的面35b均是非球面。
第六透镜36具有负屈光度，由塑料材料形成。在第六透镜36中，物体侧的面36a是凹面，像侧的面36b是凸面。该第六透镜36的物体侧的面36a和像侧的面36b均是非球面。
第七透镜37具有正屈光度，由塑料材料形成。在第七透镜37中，物体侧的面37a是凸面，像侧的面37b是凸面。该第七透镜37的物体侧的面37a和像侧的面37b均是非球面。
第八透镜38具有负屈光度，由塑料材料形成。在第八透镜38中，物体侧的面38a是凹面，像侧的面38b是凹面。该第八透镜38的物体侧的面38a和像侧的面38b均是非球面。
本实施例的光学系统30具有的各透镜31～38的非球面公式与实施例1的公式(1)相同。另外，在本实施例3中，在求表中的值时，也将公式(1)的15次以上(n≥15)的项作为0来计算。
另外，在下述表7中对透镜的结构列举了实际的数值，在表8中对各透镜面的非球面系数列举了实际的数值，在表9中对本公开的条件式列举了实际的数值。
表7
Figure PCTCN2021079394-appb-000010
Figure PCTCN2021079394-appb-000011
表8
Figure PCTCN2021079394-appb-000012
表9
Figure PCTCN2021079394-appb-000013
表9的各数值是否满足本公开的各条件式如下所示。
·表9的|f1/f2|＝2.416满足|f1/f2|＜6。
·表9的|f12/f3|＝0.235满足|f12/f3|＜0.5。
·表9的T67/T34＝0.395满足0＜T67/T34＜1.0。
·表9的TL/ImgH＝2.208满足TL/ImgH＜3。
·表9的(R7+R8)/(R7-R8)＝0.409满足0＜(R7+R8)/(R7-R8)＜1.0。
·表9的T12/T23＝1.923满足0＜T12/T23＜3.0。
·表9的T23/T34＝0.954满足0＜T23/T34＜2.0。
·表9的tan(HFOV)＝3.721满足2.0＜tan(HFOV)。
·表9的Fno＝2.80满足1.4＜Fno＜3.0。
·表9的Y11/Y82＝1.051满足0.8＜Y11/Y82＜1.5。
·表9的V6/V7＝0.329满足0＜V6/V7＜0.50。
·表9的(f/f4)-(f/f5)＝0.525满足0＜(f/f4)-(f/f5)＜2.0。
·表9的T67/CT7＝0.237满足T67/CT7＜0.50。
·表9的T78/CT8＝0.216满足T78/CT8＜0.70。
·表9的(|R13|+|R16|)/(CT7+T78+CT8)＝3.581满足
2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5。
·表9的|R14/R15|＝0.897满足0.6＜|R14/R15|＜1.3。
·表9的TL/f＝2.941满足2.0＜TL/f＜4.0。
·表9的|Sag11/Sag31|＝0.439满足|Sag11/Sag31|＜5.0。
·表9的|DST1.0/FOV|＝0.429满足|DST1.0/FOV|＜0.5。
·表9的|DST1.0/DST0.7|＝7.363满足|DST1.0/DST0.7|＜10。
·表9的f/(CT7+T78+CT8)7＝2.229满足0.3＜f/(CT7+T78+CT8)＜3.5。
·表9的CT7/CT8＝1.500满足1.0＜CT7/CT8＜2.0。
·表9的|f/f12|+|f/f3|＝0.919满足0.3＜|f/f12|+|f/f3|＜1.5。
·表9的f12/f6＝1.089满足0.5＜f12/f6＜1.5。
·表9的SD/TD＝0.558满足0.45＜SD/TD＜0.65。
·表9的YC82/f＝0.616满足0.45＜YC82/f＜0.75。
·表9的CT1/CT8＝1.000满足0.5＜CT1/CT8＜1.5。
·表9的|f5/f12|＝1.162满足0.8＜|f5/f12|＜2.5。
·表9的(T12+T23+T67+T78)/(T34+T45+T56)＝1.225满足
(T12+T23+T67+T78)/(T34+T45+T56)＜1.5。
·表9的Nmax＝1.680满足1.60＜Nmax＜1.72。
如上，能够确认关于实施例3的光学系统30的表9的各数值满足本公开各条件式。
第4实施例
[实施例4]
图13是本实施例4的光学摄像装置1的示意图，图14是按从左到右的顺序示出实施例4的光学系统40中的球面像差、像散、以及畸变(畸变像差)的像差图。
在本实施例4的光学系统40中：
第一透镜41具有负屈光度，由塑料材料形成。在第一透镜41中，物体侧的面41a是凸面，像侧的面41b是凹面。该第一透镜41的物体侧的面41a和像侧的面41b均是非球面。
第二透镜42具有负屈光度，由塑料材料形成。在第二透镜42中，物体侧的面42a是凸面，像侧的面42b是凹面。该第二透镜42的物体侧的面42a和像侧的面42b均是非球面。
第三透镜43具有正屈光度，由塑料材料形成。在第三透镜43中，物体侧的面43a是凸面，像侧的面43b是凹面。该第三透镜43的物体侧的面43a和像侧的面43b均是非球面。
第四透镜44具有正屈光度，由塑料材料形成。在第四透镜44中，物体侧的面44a是凸面，像侧的面44b是凸面。该第四透镜44的物体侧的面44a和像侧的面44b均是非球面。
第五透镜45具有正屈光度，由塑料材料形成。在第五透镜45中，物体侧的面45a是凹面，像侧的面45b是凸面。该第五透镜45的物体侧的面45a和像侧的面45b均是非球面。
第六透镜46具有负屈光度，由塑料材料形成。在第六透镜46中，物体侧的面46a是凹面，像侧的面46b是凸面。该第六透镜46的物体侧的面46a和像侧的面46b均是非球面。
第七透镜47具有正屈光度，由塑料材料形成。在第七透镜47中，物体侧的面47a是凸面，像侧的面47b是凸面。该第七透镜47的物体侧的面47a和像侧的面47b均是非球面。
第八透镜48具有负屈光度，由塑料材料形成。在第八透镜48中，物体侧的面48a是凹面，像侧的面48b是凹面。该第八透镜48的物体侧的面48a和像侧的面48b均是非球面。
本实施例的光学系统40具有的各透镜41～48的非球面公式与实施例1的公式(1)相同。另外，在本实施例4中，在求表中的值时，也将公式(1)的15次以上(n≥15)的项作为0来计算。
另外，在下述表10中对透镜的结构列举了实际的数值，在表11中对各透镜面的非球面系数列举了实际的数值，在表12中对本公开的条件式列举了实际的数值。
表10
Figure PCTCN2021079394-appb-000014
Figure PCTCN2021079394-appb-000015
表11
Figure PCTCN2021079394-appb-000016
表12
Figure PCTCN2021079394-appb-000017
表12的各数值是否满足本公开的各条件式如下所示。
·表12的|f1/f2|＝2.312满足|f1/f2|＜6。
·表12的|f12/f3|＝0.180满足|f12/f3|＜0.5。
·表12的T67/T34＝0.379满足0＜T67/T34＜1.0。
·表12的TL/ImgH＝2.181满足TL/ImgH＜3。
·表12的(R7+R8)/(R7-R8)＝0.422满足0＜(R7+R8)/(R7-R8)＜1.0。
·表12的T12/T23＝1.596满足0＜T12/T23＜3.0。
·表12的T23/T34＝0.904满足0＜T23/T34＜2.0。
·表12的tan(HFOV)＝3.738满足2.0＜tan(HFOV)。
·表12的Fno＝2.56满足1.4＜Fno＜3.0。
·表12的Y11/Y82＝0.999满足0.8＜Y11/Y82＜1.5。
·表12的V6/V7＝0.329满足0＜V6/V7＜0.50。
·表12的(f/f4)-(f/f5)＝0.645满足0＜(f/f4)-(f/f5)＜2.0。
·表12的T67/CT7＝0.231满足T67/CT7＜0.50。
·表12的T78/CT8＝0.218满足T78/CT8＜0.70。
·表12的(|R13|+|R16|)/(CT7+T78+CT8)＝3.593满足
2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5。
·表12的|R14/R15|＝0.924满足0.6＜|R14/R15|＜1.3。
·表12的TL/f＝2.927满足2.0＜TL/f＜4.0。
·表12的|Sag11/Sag31|＝0.400满足|Sag11/Sag31|＜5.0。
·表12的|DST1.0/FOV|＝0.428满足|DST1.0/FOV|＜0.5。
·表12的|DST1.0/DST0.7|＝7.403满足|DST1.0/DST0.7|＜10。
·表12的f/(CT7+T78+CT8)7＝2.212满足0.3＜f/(CT7+T78+CT8)＜3.5。
·表12的CT7/CT8＝1.500满足1.0＜CT7/CT8＜2.0。
·表12的|f/f12|+|f/f3|＝0.855满足0.3＜|f/f12|+|f/f3|＜1.5。
·表12的f12/f6＝1.079满足0.5＜f12/f6＜1.5。
·表12的SD/TD＝0.565满足0.45＜SD/TD＜0.65。
·表12的YC82/f＝0.617满足0.45＜YC82/f＜0.75。
·表12的CT1/CT8＝1.196满足0.5＜CT1/CT8＜1.5。
·表12的|f5/f12|＝1.272满足0.8＜|f5/f12|＜2.5。
·表12的(T12+T23+T67+T78)/(T34+T45+T56)＝1.059满足
(T12+T23+T67+T78)/(T34+T45+T56)＜1.5。
·表12的Nmax＝1.680满足1.60＜Nmax＜1.72。
如上，能够确认关于实施例4的光学系统40的表12的各数值满足本公开各条件式。
[实施例5]
图15是本实施例5的光学摄像装置1的示意图，图16是按从左到右的顺序示出实施例5的光学系统50中的球面像差、像散、以及畸变(畸变像差)的像差图。
在本实施例5的光学系统50中：
第一透镜51具有负屈光度，由塑料材料形成。在第一透镜51中，物体侧的面51a是凸面，像侧的面51b是凹面。该第一透镜51的物体侧的面51a和像侧的面51b均是非球面。
第二透镜52具有负屈光度，由塑料材料形成。在第二透镜52中，物体侧的面52a是凸面，像侧的面52b是凹面。该第二透镜52的物体侧的面52a和像侧的面52b均是非球面。
第三透镜53具有正屈光度，由塑料材料形成。在第三透镜53中，物体侧的面53a是凸面，像侧的面53b是凹面。该第三透镜53的物体侧的面53a和像侧的面53b均是非球面。
第四透镜54具有正屈光度，由塑料材料形成。在第四透镜54中，物体侧的面54a是凸面，像侧的面54b是凸面。该第四透镜54的物体侧的面54a和像侧的面54b均是非球面。
第五透镜55具有正屈光度，由塑料材料形成。在第五透镜55中，物体侧的面55a是凹面，像侧的面55b是凸面。该第五透镜55的物体侧的面55a和像侧的面55b均是非球面。
第六透镜56具有负屈光度，由塑料材料形成。在第六透镜56中，物体侧的面56a是凹面，像侧的面56b是凸面。该第六透镜56的物体侧的面56a和像侧的面56b均是非球面。
第七透镜57具有正屈光度，由塑料材料形成。在第七透镜57中，物体侧的面57a是凸面，像侧的面57b是凸面。该第七透镜57的物体侧的面57a和像侧的面57b均是非球面。
第八透镜58具有负屈光度，由塑料材料形成。在第八透镜58中，物体侧的面58a是凹面，像侧的面58b是凹面。该第八透镜58的物体侧的面58a和像侧的面58b均是非球面。
本实施例的光学系统50具有的各透镜51～58的非球面公式与实施例1的公式(1)相同。另外，在本实施例5中，在求表中的值时，也将公式(1)的15次以上(n≥15)的项作为0来计算。
另外，在下述表13中对透镜的结构列举了实际的数值，在表14中对各透镜面的非球面系数列举了实际的数值，在表15中对本公开的条件式列举了实际的数值。
表13
Figure PCTCN2021079394-appb-000018
Figure PCTCN2021079394-appb-000019
表14
Figure PCTCN2021079394-appb-000020
表15
Figure PCTCN2021079394-appb-000021
表15的各数值是否满足本公开的各条件式如下所示。
·表15的|f1/f2|＝3.439满足|f1/f2|＜6。
·表15的|f12/f3|＝0.181满足|f12/f3|＜0.5。
·表15的T67/T34＝0.324满足0＜T67/T34＜1.0。
·表15的TL/ImgH＝2.156满足TL/ImgH＜3。
·表15的(R7+R8)/(R7-R8)＝0.440满足0＜(R7+R8)/(R7-R8)＜1.0。
·表15的T12/T23＝1.604满足0＜T12/T23＜3.0。
·表15的T23/T34＝0.866满足0＜T23/T34＜2.0。
·表15的tan(HFOV)＝3.750满足2.0＜tan(HFOV)。
·表15的Fno＝2.38满足1.4＜Fno＜3.0。
·表15的Y11/Y82＝0.992满足0.8＜Y11/Y82＜1.5。
·表15的V6/V7＝0.329满足0＜V6/V7＜0.50。
·表15的(f/f4)-(f/f5)＝0.628满足0＜(f/f4)-(f/f5)＜2.0。
·表15的T67/CT7＝0.195满足T67/CT7＜0.50。
·表15的T78/CT8＝0.284满足T78/CT8＜0.70。
·表15的(|R13|+|R16|)/(CT7+T78+CT8)＝3.506满足
2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5。
·表15的|R14/R15|＝0.943满足0.6＜|R14/R15|＜1.3。
·表15的TL/f＝2.872满足2.0＜TL/f＜4.0。
·表15的|Sag11/Sag31|＝0.545满足|Sag11/Sag31|＜5.0。
·表15的|DST1.0/FOV|＝0.430满足|DST1.0/FOV|＜0.5。
·表15的|DST1.0/DST0.7|＝6.983满足|DST1.0/DST0.7|＜10。
·表15的f/(CT7+T78+CT8)7＝2.175满足0.3＜f/(CT7+T78+CT8)＜3.5。
·表15的CT7/CT8＝1.500满足1.0＜CT7/CT8＜2.0。
·表15的|f/f12|+|f/f3|＝0.843满足0.3＜|f/f12|+|f/f3|＜1.5。
·表15的f12/f6＝1.096满足0.5＜f12/f6＜1.5。
·表15的SD/TD＝0.569满足0.45＜SD/TD＜0.65。
·表15的YC82/f＝0.614满足0.45＜YC82/f＜0.75。
·表15的CT1/CT8＝1.125满足0.5＜CT1/CT8＜1.5。
·表15的|f5/f12|＝1.217满足0.8＜|f5/f12|＜2.5。
·表15的(T12+T23+T67+T78)/(T34+T45+T56)＝1.057满足
(T12+T23+T67+T78)/(T34+T45+T56)＜1.5。
·表15的Nmax＝1.680满足1.60＜Nmax＜1.72。
如上，能够确认关于实施例5的光学系统50的表15的各数值满足本公开各条件式。
[实施例6]
图17是本实施例6的光学摄像装置1的示意图，图18是按从左到右的顺序示出实施例6的光学系统60中的球面像差、像散、以及畸变(畸变像差)的像差图。
在本实施例6的光学系统60中：
第一透镜61具有负屈光度，由塑料材料形成。在第一透镜61中，物体侧的面61a是凸面，像侧的面61b是凹面。该第一透镜61的物体侧的面61a和像侧的面61b均是非球面。
第二透镜62具有负屈光度，由塑料材料形成。在第二透镜62中，物体侧的面62a是凹面，像侧的面62b是凹面。该第二透镜62的物体侧的面62a和像侧的面62b均是非球面。
第三透镜63具有正屈光度，由塑料材料形成。在第三透镜63中，物体侧的面63a是凸面，像侧的面63b是凹面。该第三透镜63的物体侧的面63a和像侧的面63b均是非球面。
第四透镜64具有正屈光度，由塑料材料形成。在第四透镜64中，物体侧的面64a是凸面，像侧的面64b是凸面。该第四透镜64的物体侧的面64a和像侧的面64b均是非球面。
第五透镜65具有正屈光度，由塑料材料形成。在第五透镜65中，物体侧的面65a是凹面，像侧的面65b是凸面。该第五透镜65的物体侧的面65a和像侧的面65b均是非球面。
第六透镜66具有负屈光度，由塑料材料形成。在第六透镜66中，物体侧的面66a是凹面，像侧的面66b是凸面。该第六透镜66的物体侧的面66a和像侧的面66b均是非球面。
第七透镜67具有正屈光度，由塑料材料形成。在第七透镜67中，物体侧的面67a是凸面，像侧的面67b是凸面。该第七透镜67的物体侧的面67a和像侧的面67b均是非球面。
第八透镜68具有负屈光度，由塑料材料形成。在第八透镜68中，物体侧的面68a是凹面，像侧的面68b是凹面。该第八透镜68的物体侧的面68a和像侧的面68b均是非球面。
本实施例的光学系统60具有的各透镜61～68的非球面公式与实施例1的公式(1)相同。另外，在本实施例6中，在求表中的值时，也将公式(1)的15次以上(n≥15)的项作为0来计算。
另外，在下述表16中对透镜的结构列举了实际的数值，在表17中对各透镜面的非球面系数列举了实际的数值，在表18中对本公开的条件式列举了实际的数值。
表16
Figure PCTCN2021079394-appb-000022
Figure PCTCN2021079394-appb-000023
表17
Figure PCTCN2021079394-appb-000024
表18
Figure PCTCN2021079394-appb-000025
表18的各数值是否满足本公开的各条件式如下所示。
·表18的|f1/f2|＝5.660满足|f1/f2|＜6。
·表18的|f12/f3|＝0.208满足|f12/f3|＜0.5。
·表18的T67/T34＝0.270满足0＜T67/T34＜1.0。
·表18的TL/ImgH＝2.216满足TL/ImgH＜3。
·表18的(R7+R8)/(R7-R8)＝0.416满足0＜(R7+R8)/(R7-R8)＜1.0。
·表18的T12/T23＝1.681满足0＜T12/T23＜3.0。
·表18的T23/T34＝0.875满足0＜T23/T34＜2.0。
·表18的tan(HFOV)＝3.700满足2.0＜tan(HFOV)。
·表18的Fno＝2.20满足1.4＜Fno＜3.0。
·表18的Y11/Y82＝1.232满足0.8＜Y11/Y82＜1.5。
·表18的V6/V7＝0.329满足0＜V6/V7＜0.50。
·表18的(f/f4)-(f/f5)＝0.619满足0＜(f/f4)-(f/f5)＜2.0。
·表18的T67/CT7＝0.167满足T67/CT7＜0.50。
·表18的T78/CT8＝0.250满足T78/CT8＜0.70。
·表18的(|R13|+|R16|)/(CT7+T78+CT8)＝3.394满足
2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5。
·表18的|R14/R15|＝0.791满足0.6＜|R14/R15|＜1.3。
·表18的TL/f＝2.953满足2.0＜TL/f＜4.0。
·表18的|Sag11/Sag31|＝0.333满足|Sag11/Sag31|＜5.0。
·表18的|DST1.0/FOV|＝0.428满足|DST1.0/FOV|＜0.5。
·表18的|DST1.0/DST0.7|＝6.213满足|DST1.0/DST0.7|＜10。
·表18的f/(CT7+T78+CT8)7＝2.202满足0.3＜f/(CT7+T78+CT8)＜3.5。
·表18的CT7/CT8＝1.500满足1.0＜CT7/CT8＜2.0。
·表18的|f/f12|+|f/f3|＝0.856满足0.3＜|f/f12|+|f/f3|＜1.5。
·表18的f12/f6＝1.084满足0.5＜f12/f6＜1.5。
·表18的SD/TD＝0.553满足0.45＜SD/TD＜0.65。
·表18的YC82/f＝0.644满足0.45＜YC82/f＜0.75。
·表18的CT1/CT8＝1.202满足0.5＜CT1/CT8＜1.5。
·表18的|f5/f12|＝1.222满足0.8＜|f5/f12|＜2.5。
·表18的(T12+T23+T67+T78)/(T34+T45+T56)＝1.088满足
(T12+T23+T67+T78)/(T34+T45+T56)＜1.5。
·表18的Nmax＝1.680满足1.60＜Nmax＜1.72。
如上，能够确认关于实施例6的光学系统60的表18的各数值满足本公开各条件式。
[实施例7]
图19是本实施例7的光学摄像装置1的示意图，图20是按从左到右的顺序示出实施例7的光学系统70中的球面像差、像散、以及畸变(畸变像差)的像差图。
在本实施例7的光学系统70中：
第一透镜71具有负屈光度，由塑料材料形成。在第一透镜71中，物体侧的面71a是凸面，像侧的面71b是凹面。该第一透镜71的物体侧的面71a和像侧的面71b均是非球面。
第二透镜72具有负屈光度，由塑料材料形成。在第二透镜72中，物体侧的面72a是凹面，像侧的面72b是凹面。该第二透镜72的物体侧的面72a和像侧的面72b均是非球面。
第三透镜73具有正屈光度，由塑料材料形成。在第三透镜73中，物体侧的面73a是凸面，像侧的面73b是凹面。该第三透镜73的物体侧的面73a和像侧的面73b均是非球面。
第四透镜74具有正屈光度，由塑料材料形成。在第四透镜74中，物体侧的面74a是凸面，像侧的面74b是凸面。该第四透镜74的物体侧的面74a和像侧的面74b均是非球面。
第五透镜75具有正屈光度，由塑料材料形成。在第五透镜75中，物体侧的面75a是凹面，像侧的面75b是凸面。该第五透镜75的物体侧的面75a和像侧的面75b均是非球面。
第六透镜76具有负屈光度，由塑料材料形成。在第六透镜76中，物体侧的面76a是凹面，像侧的面76b是凸面。该第六透镜76的物体侧的面76a和像侧的面76b均是非球面。
第七透镜77具有正屈光度，由塑料材料形成。在第七透镜77中，物体侧的面77a是凸面，像侧的面77b是凸面。该第七透镜77的物体侧的面77a和像侧的面77b均是非球面。
第八透镜78具有负屈光度，由塑料材料形成。在第八透镜78中，物体侧的面78a是凹面，像侧的面78b是凹面。该第八透镜78的物体侧的面78a和像侧的面78b均是非球面。
本实施例的光学系统70具有的各透镜71～78的非球面公式与实施例1的公式(1)相同。另外，在本实施例7中，在求表中的值时，也将公式(1)的15次以上(n≥15)的项作为0来计算。
另外，在下述表19中对透镜的结构列举了实际的数值，在表20中对各透镜面的非球面系数列举了实际的数值，在表21中对本公开的条件式列举了实际的数值。
表19
Figure PCTCN2021079394-appb-000026
Figure PCTCN2021079394-appb-000027
表20
Figure PCTCN2021079394-appb-000028
表21
Figure PCTCN2021079394-appb-000029
表21的各数值是否满足本公开的各条件式如下所示。
·表21的|f1/f2|＝5.803满足|f1/f2|＜6。
·表21的|f12/f3|＝0.212满足|f12/f3|＜0.5。
·表21的T67/T34＝0.270满足0＜T67/T34＜1.0。
·表21的TL/ImgH＝2.200满足TL/ImgH＜3。
·表21的(R7+R8)/(R7-R8)＝0.415满足0＜(R7+R8)/(R7-R8)＜1.0。
·表21的T12/T23＝1.578满足0＜T12/T23＜3.0。
·表21的T23/T34＝0.869满足0＜T23/T34＜2.0。
·表21的tan(HFOV)＝3.702满足2.0＜tan(HFOV)。
·表21的Fno＝2.08满足1.4＜Fno＜3.0。
·表21的Y11/Y82＝1.214满足0.8＜Y11/Y82＜1.5。
·表21的V6/V7＝0.329满足0＜V6/V7＜0.50。
·表21的(f/f4)-(f/f5)＝0.615满足0＜(f/f4)-(f/f5)＜2.0。
·表21的T67/CT7＝0.167满足T67/CT7＜0.50。
·表21的T78/CT8＝0.250满足T78/CT8＜0.70。
·表21的(|R13|+|R16|)/(CT7+T78+CT8)＝3.385满足
2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5。
·表21的|R14/R15|＝0.787满足0.6＜|R14/R15|＜1.3。
·表21的TL/f＝2.940满足2.0＜TL/f＜4.0。
·表21的|Sag11/Sag31|＝0.326满足|Sag11/Sag31|＜5.0。
·表21的|DST1.0/FOV|＝0.427满足|DST1.0/FOV|＜0.5。
·表21的|DST1.0/DST0.7|＝6.346满足|DST1.0/DST0.7|＜10。
·表21的f/(CT7+T78+CT8)7＝2.195满足0.3＜f/(CT7+T78+CT8)＜3.5。
·表21的CT7/CT8＝1.500满足1.0＜CT7/CT8＜2.0。
·表21的|f/f12|+|f/f3|＝0.853满足0.3＜|f/f12|+|f/f3|＜1.5。
·表21的f12/f6＝1.082满足0.5＜f12/f6＜1.5。
·表21的SD/TD＝0.556满足0.45＜SD/TD＜0.65。
·表21的YC82/f＝0.645满足0.45＜YC82/f＜0.75。
·表21的CT1/CT8＝1.205满足0.5＜CT1/CT8＜1.5。
·表21的|f5/f12|＝1.216满足0.8＜|f5/f12|＜2.5。
·表21的(T12+T23+T67+T78)/(T34+T45+T56)＝1.051满足
(T12+T23+T67+T78)/(T34+T45+T56)＜1.5。
·表21的Nmax＝1.680满足1.60＜Nmax＜1.72。
如上，能够确认关于实施例7的光学系统70的表21的各数值满足本公开各条件式。
虽然为了表现本公开，在上述中参照附图通过实施方式适当且充分地对本公开进行了说明，但是本领域技术人员应该认识到，变更和/或改良上述实施方式是容易实现的。因此，只要本领域技术人员实施的变更方式或改良方式不是脱离权利要求书中记载的权利要求范围的水平，则可以解释为该变更方式或该改良方式被包括在该权利要求范围内。
附图标记说明：
1：光学摄像装置
2：光电转换元件
3：传感器支架
4：驱动部
5：孔径光阑
6：透镜保持部件
7：遮光部件
8：遮光片
8a：遮光兼间隔调整垫片
9：透镜压紧环
F：IR截止滤波器
10、20、30、40、50、60、70：摄像光学系统
10a：成像面
11、21、31、41、51、61、71：第一透镜
11a、21a、31a、41a、51a、61a、71a：第一透镜的物体侧的面
11b、21b、31b、41b、51b、61b、71b：第一透镜的像侧的面
12、22、32、42、52、62、72：第二透镜
12a、22a、32a、42a、52a、62a、72a：第二透镜的物体侧的面
12b、22b、32b、42b、52b、62b、72b：第二透镜的像侧的面
13、23、33、34、35、36、37：第三透镜
13a、23a、33a、43a、53a、63a、73a：第三透镜的物体侧的面
13b、23b、33b、43b、53b、63b、73b：第三透镜的像侧的面
14、24、34、44、45、46、47：第四透镜
14a、24a、34a、44a、54a、64a、74a：第四透镜的物体侧的面
14b、24b、34b、44b、54b、64b、74b：第四透镜的像侧的面
15、25、35、45、55、56、57：第五透镜
15a、25a、35a、45a、55a、65a、75a：第五透镜的物体侧的面
15b、25b、35b、45b、55b、65b、75b：第五透镜的像侧的面
16、26、36、46、56、66、67：第六透镜
16a、26a、36a、46a、56a、66a、76a：第六透镜的物体侧的面
16b、26b、36b、46b、56b、66b、76b：第六透镜的像侧的面
17、27、37、47、57、67、77：第七透镜
17a、27a、37a、47a、57a、67a、77a：第七透镜的物体侧的面
17b、27b、37b、47b、57b、67b、77b：第七透镜的像侧的面
171a：第七透镜的物体侧的面的中心部
172a：第七透镜的物体侧的面的周边部
18a、28a、38a、48a、58a、68a、78a：第八透镜的物体侧的面
18b、28b、38b、48b、58b、68b、78b：第八透镜的像侧的面
181b：第八透镜的像侧的面的中心部
182b：第八透镜的像侧的面的周边部
F：光学系统整体的焦距
Fno：光圈值
FOV：最大视场角
HFOV：最大视场角的二分之一
TL：从第一透镜的物体侧的面到成像面的沿着光轴的距离
ImgH：光学系统的最大像高
f1：第一透镜的焦距
f2：第二透镜的焦距
f3：第三透镜的焦距
f4：第四透镜的焦距
f5：第五透镜的焦距
f6：第六透镜的焦距
f12：第一透镜与第二透镜的合成焦距
SD：从光圈到第七透镜的像侧的面的沿着光轴的距离
TD：从第一透镜的物体侧的面到第八透镜的像侧的面的沿着光轴的距离
CT1：第一透镜的中心厚度
CT7：第七透镜的中心厚度
CT8：第八透镜的中心厚度
T12：从第一透镜的像侧的面到第二透镜的物体侧的面的沿着光轴的距离
T23：从第二透镜的像侧的面到第三透镜的物体侧的面的沿着光轴的距离
T34：从第三透镜的像侧的面到第四透镜的物体侧的面的沿着光轴的距离
T45：从第四透镜的像侧的面到第五透镜的物体侧的面的沿着光轴的距离
T56：从第五透镜的像侧的面到第六透镜的物体侧的面的沿着光轴的距离
T67：从第六透镜的像侧的面到第七透镜的物体侧的面的沿着光轴的距离
T78：从第七透镜的像侧的面到第八透镜的物体侧的面的沿着光轴的距离
R7：第四透镜的物体侧的面的曲率半径
R8：第四透镜的像侧的面的曲率半径
R13：第七透镜的物体侧的面的曲率半径
R14：第七透镜的像侧的面的曲率半径
R15：第八透镜的物体侧的面的曲率半径
R16：第八透镜的像侧的面的曲率半径
V6：第六透镜的色散系数
V7：第七透镜的色散系数
Y11：第一透镜的物体侧的面的最大有效半径
Y82：第八透镜的像侧的面的最大有效半径
Yc82：第八透镜的像侧的面的最大拐点和光轴在与该光轴正交的方向上的距离
Sag11：从第一透镜的物体侧的面中的与光轴的交点到第一透镜的物体侧的面的最大有效半径位置的在光轴方向上的位移量
Sag31：从第三透镜的物体侧的面中的与光轴的交点到第三透镜的物体侧的面的最大有效半径位置的在光轴方向上的位移量
DST1.0：最大像高的畸变像差量
DST0.7：最大像高的70％像高的畸变像差量
Nmax：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、第八透镜的折射率最大值。

Claims (25)

  1. 一种摄像光学系统，其特征在于，具备：
    在从物体侧向像侧的方向上按顺序排列的第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜、以及第八透镜；
    所述第一透镜具有负屈光度，其像侧的面是凹面；
    所述第二透镜具有负屈光度，其像侧的面是凹面；
    所述第三透镜具有正屈光度，其像侧的面是凹面；
    所述第四透镜具有正屈光度，其像侧的面是凸面；
    所述第五透镜具有正屈光度，其物体侧的面是凹面，并且像侧的面是凸面；
    所述第六透镜具有负屈光度，其物体侧的面是凹面，并且像侧的面是凸面；
    所述第七透镜，其物体侧的面是中心部为凸面并且在该中心部的周边部上具有至少一个拐点的非球面，并且像侧的面是凸面；
    所述第八透镜，其物体侧的面是凹面，像侧的面是中心部为凹面并且在该中心部的周边部上具有至少一个拐点的非球面；
    在将所述第一透镜的焦距设为f1，将所述第二透镜的焦距设为f2，将所述第一透镜与所述第二透镜的合成焦距设为f12，将所述第三透镜的焦距设为f3，将从所述第三透镜的所述像侧的面到所述第四透镜的物体侧的面的沿着光轴的距离设为T34，并将从所述第六透镜的所述像侧的面到所述第七透镜的所述物体侧的面的沿着光轴的距离设为T67时，满足：
    |f1/f2|＜6
    |f12/f3|＜0.5
    0＜T67/T34＜1.0。
  2. 根据权利要求1所述的摄像光学系统，其特征在于，具备：
    孔径光阑，所述孔径光阑配置于所述第三透镜与所述第四透镜之间；
    在将从所述第一透镜的物体侧的面到成像面的沿着光轴的距离设为TL，并将最大像高设为ImgH时，满足：
    TL/ImgH＜3。
  3. 根据权利要求1所述的摄像光学系统，其特征在于，
    在将所述第四透镜的物体侧的面的曲率半径设为R7，并将该第四透镜的像侧的面的曲率半径设为R8时，满足：
    0＜(R7+R8)/(R7-R8)＜1.0。
  4. 根据权利要求1所述的摄像光学系统，其特征在于，
    在将从所述第一透镜的所述像侧的面到所述第二透镜的物体侧的面的沿着光轴的距离设为T12，将从所述第二透镜的像侧的面到所述第三透镜的物体侧的面的沿着光轴的距离设为T23，并将从所述第三透镜的像侧的面到所述第四透镜的物体侧的面的沿着光轴的距离设为T34时，满足：
    0＜T12/T23＜3.0
    0＜T23/T34＜2.0。
  5. 根据权利要求1所述的摄像光学系统，其特征在于，
    在将最大视场角的二分之一设为HFOV，并将光圈值设为Fno时，满足：
    2.0＜tan(HFOV)
    1.4＜Fno＜3.0。
  6. 根据权利要求1所述的摄像光学系统，其特征在于，
    在将所述第一透镜的物体侧的面的最大有效半径设为Y11，并将所述第八透镜的像侧的面的最大有效半径设为Y82时，满足：
    0.8＜Y11/Y82＜1.5。
  7. 根据权利要求1所述的摄像光学系统，其特征在于，
    在将所述第六透镜的色散系数设为V6，并将所述第七透镜的色散系数设为V7时，满足：
    0＜V6/V7＜0.50。
  8. 根据权利要求1所述的摄像光学系统，其特征在于，
    在将该摄像光学系统的焦距设为f，将所述第四透镜的焦距设为f4，并将所述第五透镜的焦距设为f5时，满足：
    0＜(f/f4)-(f/f5)＜2.0。
  9. 根据权利要求1所述的摄像光学系统，其特征在于，
    在将从所述第六透镜的像侧的面到所述第七透镜的物体侧的面的沿着光轴的距离设为T67，将所述第七透镜的沿着光轴的厚度设为CT7，将从所述第七透镜的像侧的面到所述第八透镜的物体侧的面的沿着光轴的距离设为T78，并将所述第八透镜的沿着光轴的厚度设为CT8时，满足：
    T67/CT7＜0.50
    T78/CT8＜0.70。
  10. 根据权利要求1所述的摄像光学系统，其特征在于，
    在将所述第七透镜的物体侧的面的曲率半径设为R13，将所述第七透镜的像侧的面的曲率半径设为R14，将所述第八透镜的物体侧的面的曲率半径设为R15，将所述第八透镜的像侧的面的曲率半径设为R16，将该第七透镜的沿着光轴的厚度设为CT7，将从所述第七透镜的像侧的面到所述第八透镜的物体侧的面的沿着光轴的距离设为T78，将所述第八透镜的沿着光轴的厚度设为CT8，将从所述第一透镜的物体侧的面到成像面的沿着光轴的距离设为TL，并将该摄像光学系统整体的焦距设为f时，满足：
    2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5
    0.6＜|R14/R15|/1.3
    2.0＜TL/f＜4.0。
  11. 根据权利要求1所述的摄像光学系统，其特征在于，
    在将从所述第一透镜的物体侧的面中的与光轴的交点到该物体侧的面的最大有效半径位置的在光轴方向上的位移量设为Sag11，并将从所述第三透镜的物体侧的面中的与光轴的交点到该物体侧的面的最大有效半径位置的在光轴方向上的位移量设为Sag31时，满足：
    |Sag11/Sag31|＜5.0。
  12. 根据权利要求1所述的摄像光学系统，其特征在于，
    在将最大像高的畸变像差量设为DST1.0，将所述最大像高的70％像高的畸变像差量设为DST0.7，并将最大视场角设为FOV时，满足：
    |DST1.0/FOV|＜0.5(％/度)
    |DST1.0/DST0.7|＜10。
  13. 一种摄像光学系统，其特征在于，具备：
    在从物体侧向像侧的方向上按顺序排列的第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜、以及第八透镜；
    所述第一透镜具有负屈光度；
    所述第二透镜的像侧的面是凹面；
    所述第三透镜的像侧的面是凹面；
    所述第四透镜的像侧的面是凸面；
    所述第五透镜具有正屈光度，其像侧的面是凸面；
    所述第六透镜具有负屈光度，其物体侧的面是凹面，并且像侧的面是凸面；
    所述第七透镜具有正屈光度，其物体侧的面是中心部为凸面并且在该中心部的周边部上具有至少一个拐点的非球面；
    所述第八透镜，其像侧的面是中心部为凹面并且在该中心部的周边部上具有至少一个拐点的非球面；
    在将所述第一透镜的焦距设为f1，将所述第二透镜的焦距设为f2，将所述第一透镜与所述第二透镜的合成焦距设为f12，将所述第三透镜的焦距设为f3，将由所述第一～第八透镜构成的光学系统整体的焦距设为f，将所述第七透镜的沿着光轴的厚度设为CT7，将从所述第七透镜的像侧的面到所述第八透镜的物体侧的面的沿着光轴的距离设为T78，并将所述第八透镜的沿着光轴的厚度设为CT8时，满足：
    0.3＜f/(CT7+T78+CT8)＜3.5
    1.0＜CT7/CT8＜2.0
    |f1/f2|＜6
    |f12/f3|＜0.5。
  14. 根据权利要求13所述的摄像光学系统，其特征在于，
    所述第一透镜的像侧的面是凹面；
    在将所述第七透镜的物体侧的面的曲率半径设为R13，将该第七透镜的像侧的面的曲率半径设为R14，将所述第八透镜的物体侧的面的曲率半径设为R15，将所述第八透镜的像侧的面的曲率半径设为R16，将该第七透镜的沿着光轴的厚度设为CT7，将从所述第七透镜的像侧的面到所述第八透镜的物体侧的面的沿着光轴的距离设为T78，并将所述第八透镜的沿着光轴的厚度设为CT8时，满足：
    2.0＜(|R13|+|R16|)/(CT7+T78+CT8)＜4.5
    0.6＜|R14/R15|/1.3。
  15. 根据权利要求13所述的摄像光学系统，其特征在于，满足：
    0.3＜|f/f12|+|f/f3|＜1.5。
  16. 根据权利要求13所述的摄像光学系统，其特征在于，
    在将所述第六透镜的焦距设为f6时，满足：
    0.5＜f12/f6＜1.5。
  17. 根据权利要求13所述的摄像光学系统，其特征在于，具备：
    孔径光阑；
    在将从所述孔径光阑到所述第八透镜的像侧的面的沿着光轴的距离设为SD，将从所述第一透镜的物体侧的面到所述第八透镜的像侧的面的沿着光轴的距离设为TD，将所述第一透镜的物体侧的面的最大有效半径设为Y11，并将所述第八透镜的像侧的面的最大有效半径设为Y82时，满足：
    0.45＜SD/TD＜0.65
    0.8＜Y11/Y82＜1.5。
  18. 根据权利要求13所述的摄像光学系统，其特征在于，
    在将所述第八透镜的像侧的面的最大拐点和光轴在与该光轴正交的方向上的距离设为Yc82时，满足：
    0.45＜Yc82/f＜0.75。
  19. 根据权利要求13所述的摄像光学系统，其特征在于，
    在将最大像高的畸变像差量设为DST1.0，将所述最大像高的70％像高的畸变像差量设为DST0.7，并将最大视场角设为FOV时，满足：
    |DST1.0/FOV|＜0.5(％/度)
    |DST1.0/DST0.7|＜10。
  20. 一种摄像光学系统，其特征在于，具备：
    在从物体侧向像侧的方向上按顺序排列的第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜、以及第八透镜；
    所述第一透镜具有负屈光度；
    所述第二透镜的像侧的面是凹面；
    所述第三透镜的物体侧的面是凸面；
    所述第四透镜的物体侧的面是凸面；
    所述第五透镜具有正屈光度；
    所述第六透镜具有负屈光度，其物体侧的面是凹面，并且像侧的面是凸面；
    所述第七透镜具有正屈光度，其像侧的面是凸面；
    所述第八透镜，其像侧的面是中心部为凹面并且在该中心部的周边部上具有至少一个拐点的非球面；
    在将所述第一透镜的沿着光轴的厚度设为CT1，并将所述第八透镜的沿着光轴的厚度设为CT8时，满足：
    0.5＜CT1/CT8＜1.5。
  21. 根据权利要求20所述的摄像光学系统，其特征在于，
    在将所述第一透镜与所述第二透镜的合成焦距设为f12，并将所述第五透镜的焦距设为f5时，满足：
    0.8＜|f5/f12|＜2.5。
  22. 根据权利要求20所述的摄像光学系统，其特征在于，
    在将从所述第一透镜的物体侧的面中的与光轴的交点到该物体侧的面的最大有效半径位置的在光轴方向上的位移量设为Sag11，并将从所述第三透镜的物体侧的面中的与光轴的交点到该物体侧的面的最大有效半径位置的在光轴方向上的位移量设为Sag31时，满足：
    |Sag11/Sag31|＜5.0。
  23. 根据权利要求20所述的摄像光学系统，其特征在于，
    在将从所述第一透镜的像侧的面到所述第二透镜的物体侧的面的沿着光轴的距离设为T12，将从所述第二透镜的像侧的面到所述第三透镜的物体侧的面的沿着光轴的距离设为T23，将从所述第三透镜的像侧的面到所述第四透镜的物体侧的面的沿着光轴的距离设为T34，将从所述第四透镜的像侧的面到所述第五透镜的物体侧的面的沿着光轴的距离设为T45，将从所述第五透镜的像侧的面到所述第六透镜的物体侧的面的沿着光轴的距离设为T56，将从所述第六透镜的像侧的面到所述第七透镜的物体侧的面的沿着光轴的距离设为T67，并将从所述第七透镜的像侧的面到所述第八透镜的物体侧的面的沿着光轴的距离设为T78时，满足：
    (T12+T23+T67+T78)/(T34+T45+T56)＜1.5。
  24. 根据权利要求20所述的摄像光学系统，其特征在于，
    在将所述第一透镜、所述第二透镜、所述第三透镜、所述第四透镜、所述第五透镜、所述第六透镜、所述第七透镜、以及所述第八透镜的各透镜中的折射率的最大值设为Nmax时，满足：
    1.60＜Nmax＜1.72。
  25. 一种光学摄像装置，其特征在于，具备：
    权利要求1～24中任一项所述的摄像光学系统；
    驱动部，其驱动所述摄像光学系统具有的所述第一～所述第八透镜的全部或部分透镜；以及
    光电转换元件，其配置于所述摄像光学系统的成像面。
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