WO2021159406A1 - Imaging lens, camera module and imaging device - Google Patents

Imaging lens, camera module and imaging device Download PDF

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Publication number
WO2021159406A1
WO2021159406A1 PCT/CN2020/075130 CN2020075130W WO2021159406A1 WO 2021159406 A1 WO2021159406 A1 WO 2021159406A1 CN 2020075130 W CN2020075130 W CN 2020075130W WO 2021159406 A1 WO2021159406 A1 WO 2021159406A1
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WO
WIPO (PCT)
Prior art keywords
lens
optical system
imaging
group optical
refractive power
Prior art date
Application number
PCT/CN2020/075130
Other languages
French (fr)
Inventor
Daigo Katsuragi
Original Assignee
Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Guangdong Oppo Mobile Telecommunications Corp., Ltd. filed Critical Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority to CN202080092738.9A priority Critical patent/CN115244445B/en
Priority to PCT/CN2020/075130 priority patent/WO2021159406A1/en
Publication of WO2021159406A1 publication Critical patent/WO2021159406A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • 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
    • G02B13/04—Reversed telephoto objectives

Definitions

  • the present disclosure relates to an imaging lens, a camera module, and an imaging device, and more specifically, to an imaging lens, a camera module, and an imaging device that are small and enable good optical performance.
  • optical systems composed of, in order from an object side, a front group optical system having a negative refractive power and a rear group optical system having a positive refractive power are well known as imaging optical systems used in imaging devices such as in-vehicle cameras, surveillance cameras, video cameras, and electronic still cameras.
  • the present disclosure aims to solve at least one of the technical problems mentioned above. Accordingly, the present disclosure needs to provide an imaging lens, a camera module, and an imaging device.
  • an imaging lens includes:
  • the front group optical system includes at least one lens having a negative refractive power
  • the rear group optical system includes at least one lens having a positive refractive power, an aperture stop and at least one lens having a negative refractive power,
  • the aperture stop is positioned on the imaging surface side with respect to a most object side positioned positive refractive power lens of the at least one lens having a positive refractive power
  • a lens of the front group optical system positioned on the most object side, in is a lens having a negative refractive power and functioning as a lens protection filter, and
  • a lens of the rear group optical system positioned on the most imaging surface side has, on the imaging surface side, an aspheric shape having an inflection point.
  • the imaging lens may satisfy the following conditional expression:
  • r11 is a center radius of curvature of the object side surface of the most object side positioned lens of the front group optical system and r12 is a center radius of curvature of the imaging surface side surface of the most object side positioned lens of the front group optical system.
  • the imaging lens may satisfy the following conditional expression:
  • ⁇ d is a distance on an optical axis from a vertex of the object side surface of the most object side positioned lens of the front group optical system to an imaging surface and f is a focal length of an entire optical system including the front group optical system and the rear group optical system.
  • the imaging lens may satisfy the following conditional expression:
  • fs is a composite focal length of the rear group optical system and f is a focal length of an entire optical system including the front group optical system and the rear group optical system.
  • the most imaging surface side positioned lens of the rear group optical system may be a lens having a negative refractive power.
  • a surface on a side of an imaging surface of the most imaging surface side positioned lens of the rear group optical system may have a concave shape near an optical axis and a convex shape in a peripheral area.
  • an angle of view of the imaging lens may be 100 degrees or more.
  • the most imaging surface side positioned lens of the rear group optical system may be formed of plastic.
  • a camera module includes:
  • an image sensor including an imaging surface
  • the lens of the front group optical system positioned on the most object side, is functioning as a lens protection filter and disposed on a housing of the camera module.
  • an imaging device includes the camera module.
  • FIG. 1 is a configuration diagram of a camera module according to a first example of the present disclosure
  • FIG. 2 is an aberration diagram of the camera module according to the first example of the present disclosure
  • FIG. 3 is a configuration diagram of a camera module according to a second example of the present disclosure.
  • FIG. 4 is an aberration diagram of the camera module according to the second example of the present disclosure.
  • FIG. 5 is a configuration diagram of a camera module according to a third example of the present disclosure.
  • FIG. 6 is an aberration diagram of the camera module according to the third example of the present disclosure.
  • FIG. 7 is a configuration diagram of a camera module according to a fourth example of the present disclosure.
  • FIG. 8 is an aberration diagram of the camera module according to the fourth example of the present disclosure.
  • FIG. 9 is a configuration diagram of a camera module according to a fifth example of the present disclosure.
  • FIG. 10 is an aberration diagram of the camera module according to the fifth example of the present disclosure.
  • a camera module to which the present disclosure is applied is configured as shown in FIGS. 1, 3, 5, 7, and 9, for example.
  • dash –dot lines represent optical axes of the camera modules.
  • the camera module 11 includes an imaging lens 21, an optical filter 22 and an image sensor 23.
  • the imaging lens 21 is, for example, a super-wide-angle lens with an angle of 100 degrees or more.
  • the imaging lens 21 includes a front group optical system 31 and a rear group optical system 32.
  • the front group optical system 31 is an optical system whose position is fixed in a housing of the camera module 11.
  • the rear group optical system 32 is an optical system which can be moved in the optical axis direction by an actuator located in the housing of the camera module 11.
  • the rear group optical system 32 can be used for a focusing operation in which the imaging lens 21 is focused on a subject.
  • the front group optical system 31 and the rear group optical system 32 are disposed in order from an object side toward an imaging surface S side.
  • the front group optical system 31 includes at least one lens having a negative refractive power.
  • the rear group optical system 32 includes at least one lens having a positive refractive power, an aperture stop 4 and at least one lens having a negative refractive power. That is, the aperture stop 4 is provided in the rear group optical system 32 and can be moved in the optical axis direction together with the lens of the rear group optical system 32, by means of the focusing operation.
  • the aperture stop 4 is positioned on the imaging surface side with respect to a most object side positioned positive refractive power lens of the at least one lens having a positive refractive power.
  • the image sensor 23 is, for example, a solid-state image sensor such as a CMOS (Complementary Metal Oxide Semiconductor) or a CCD (Charge Coupled Device) .
  • the image sensor 23 has the imaging surface S which is an imaging plane of the imaging lens 21.
  • the image sensor 23 receives light incident from the subject (object side) via the imaging lens 21 and the optical filter 22, it photoelectrically converts the light, and outputs an image data obtained by the photoelectric conversion of the light to a subsequent stage.
  • the front group optical system 31 includes at least one lens having a negative refractive power
  • the rear group optical system 32 includes at least one lens having a positive refractive power and at least one lens having a negative refractive power
  • the lens of the rear group optical system 32 positioned on the most imaging surface S side, has, on the imaging surface S side, an aspheric shape having an inflection point.
  • the front group optical system 31 includes at least one lens having a negative refractive power as described above, chromatic aberrations can be appropriately corrected and good optical performance can be obtained. In addition, light can be refracted sharply, and a total optical length can be shortened even when an angle of view is wide.
  • the rear group optical system 32 includes at least one lens having a positive refractive power and at least one lens having a negative refractive power; and the lens of the rear group optical system 32 positioned on the most imaging surface S side, has, on the imaging surface S side, an aspheric shape having an inflection point, it is possible to make part of the rear group optical system 32 to have a large negative refractive power in order to shorten the back focus of the imaging lens 21.
  • the most imaging surface S side positioned lens of the rear group optical system 32 has a negative refractive power, i.e. has negative optical power near the optical axis, it is suitable for shortening the back focus.
  • the most imaging surface S side positioned lens of the rear group optical system 32 has, on the imaging surface S side, an aspheric shape having an inflection point in the vicinity of the lens edge.
  • a surface on the side of the imaging surface S of the most imaging surface S side positioned lens of the rear group optical system 32 has a concave shape in the lens center (i.e. near the optical axis) and a convex shape in a peripheral area (i.e. in the vicinity of an outer peripheral area) .
  • a lens, positioned on the most object side, of the front group optical system 31 is a lens functioning as a lens protection filter.
  • a lens can be realized, for example, by forming a transparent cover into a lens shape, the transparent cover being disposed on a housing of the camera module 11 on the optical axis so as to cover the inside of the housing.
  • vignetting in which light from the object incident on the peripheral side of the imaging lens at a large incident angle is blocked by the cover glass or a lens barrel, may occur.
  • a sufficiently wide angle lens in which "vignetting" is sufficiently suppressed can be realized by including a lens functioning as a lens protection filter instead of a conventional cover glass.
  • the camera module 11 allows the miniaturization of the imaging lens 21 while maintaining a good optical performance of the imaging lens 21 by satisfying the following formula (1) :
  • r11 is a center radius of a curvature of the object side surface of the most object side positioned lens of the front group optical system 31 and r12 is a center radius of a curvature of the imaging surface S side surface of the most object side positioned lens of the front group optical system 31.
  • the imaging lens 21 may be further miniaturized when the camera module 11 satisfies the following formula (2) :
  • ⁇ d is a full length of the imaging lens 21, that is, a distance on the optical axis from a vertex of the object side surface of the most object side positioned lens to an imaging surface S;
  • f is a focal length of an entire optical system including the front group optical system 31 and the rear group optical system 32 (the same applies hereinafter) .
  • the imaging lens 21 becomes smaller.
  • a sufficiently small ima ging lens 21 can be obtained when the ratio of the full length ⁇ d and the focal length f is less than 8.
  • the full length ⁇ d of the imaging lens 21 becomes shorter as the ratio of the full length ⁇ d and the focal length f decreases. Further, if the back focus of the imaging lens 21 is shortened, the full length ⁇ d of the imaging lens 21 is shortened accordingly.
  • the ratio of the full length ⁇ d and the focal length f satisfies the following formula (2) ’:
  • the imaging lens 21 may be more reliably miniaturized and its good optical performance may be maintained when the camera module 11 satisfies the following formula (3) :
  • fs is a composite focal length of the rear group optical system 32 (the same applies hereinafter) .
  • the value of fs /f falls below the lower limit value of the formula (3) (i.e. 0.25) , the sensitivity of the decentering error of the rear group optical system 32 becomes very high and the difficulty of manufacturing increases.
  • the value of fs /f exceeds the upper limit value of the formula (3) (i.e. 5.0) , a spherical aberration is overcorrected and it is difficult to maintain the optical performance.
  • an aspheric lens in the imaging lens 21, particularly an aspheric lens of aspheric shape having an inflection point is formed of a plastic material (glass material) .
  • a lens having a size equal to or smaller than a specific size may be a lens formed of a plastic material, and a lens larger than the specific size may be a lens formed of a glass material. This is because it is difficult to form an aspheric lens or a relatively small lens using a glass material instead of a plastic material.
  • the imaging lens 21 having a small size and sufficient optical performance can be obtained even when the angle of view is 100 degrees or more.
  • the lens of the rear group optical system 32 positioned on the most imaging surface S side has, on the imaging surface S side, an aspheric shape having an inflection point, while the imaging lens 21 balances the chromatic aberrations between the front group optical system 31 and the rear group optical system 32.
  • the back focus can be further shortened, and the imaging lens 21 having a small size and good optical performance can be obtained.
  • Such a camera module 11 including the imaging lens 21 is applicable to compact digital devices (imaging devices) such as mobile phones, wearable cameras and surveillance cameras. ⁇ Configuration examples of the camera module>
  • Si indicates the ordinal number of the i-th surface which sequentially increases from the object side toward the imaging surface S side. Optical elements of the corresponding surfaces are shown together with the corresponding surface number “Si” . Denotations of “first surface” or “1st surface” indicate a surface on the object side of the lens, and denotations of “second surface” or “2nd surface” indicate a surface on the imaging surface S side of the lens. “Ri” indicates a central radius of curvature value (mm) of the i-th surface.
  • E + i indicates an exponential expression with a base of 10, i.e., "10 i " .
  • “1.00 E +18” indicates “1.00 ⁇ 10 18 " .
  • Such an exponential expression is also applied to an aspheric coefficient described later.
  • “Di” indicates a value of a distance on the optical axis between the i-th surface and the (i + 1) -th surface (mm) .
  • “Ndi” indicates a value of a refractive index at d-line (wavelength 587.6 nm) of the material of the optical element having the i-th surface.
  • ⁇ di indicates a value of the Abbe number at d-line of the material of the optical element having the i-th surface.
  • “Fno” indicates an F number.
  • “2 ⁇ ” indicates an angle of view.
  • the imaging lens 21 used in the following examples includes lenses having aspheric surfaces.
  • the aspheric shape of the lens is defined by the following formula (4) :
  • Z is a depth of the aspheric surface.
  • C is a paraxial curvature which is equal to 1 /R, h is a distance from the optical axis to a lens surface, K is an eccentricity (second-order aspheric coefficient) , and An is an nth-order aspheric coefficient.
  • the front group optical system 31 includes a first lens L1 having a negative refractive power with a concave surface facing the imaging surface S side and a second lens L2 having a positive refractive power with a convex surface facing the imaging surface S side, in order from the object side toward the imaging surface S side.
  • the rear group optical system 32 includes a third lens L3 having a positive refractive power with a convex surface facing the object side, a fourth lens L4 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fifth lens L5 having a negative refractive power with a concave surface facing the imaging surface S side, a sixth lens L6 having a positive refractive power with a convex surface facing the imaging surface S side and a seventh lens L7 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging surface S side.
  • the aperture stop 4 is disposed on the imaging surface S side with respect to the vertex of the first surface of the fourth lens L4 and on the object side with respect to the second surface of the fourth lens L4.
  • Table 1 shows lens data of the first example.
  • Table 2 shows the refractive power of the lenses.
  • Table 3 shows values of the focal length of the entire system f, the F number Fno, the angle of view 2 ⁇ , the full length, and the composite focal length of the rear group optical system 32: fs, (r11 + r12) / (r11 -r12) , ⁇ d /f and fs /f.
  • Table 4 shows values of the aspheric coefficients of the imaging lens 21.
  • FIG. 2 shows spherical aberration, astigmatism (field curvature) and distortion as examples of aberrations.
  • Each of these aberration diagrams shows aberrations with d-line (587.56 nm) as a reference wavelength.
  • d-line 587.56 nm
  • g-line 435.84 nm
  • C-line 656.27 nm
  • S indicates a value of aberration on a sagittal image surface
  • T indicates a value of aberration on a tangential image surface.
  • the camera module 11 in the first example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size and wide in angle.
  • lens configurations of the front group optical system 31 and the rear group optical system 32 are different from those of the first example.
  • the front group optical system 31 includes a first lens L1 having a negative refractive power with a concave surface facing the imaging surface S side, and a second lens L2 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging surface S side.
  • the rear group optical system 32 includes a third lens L3 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fourth lens L4 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fifth lens L5 having a negative refractive power with concave surfaces facing the object side and the imaging surface S side, a sixth lens L6 having a negative refractive power and a seventh lens L7 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging surface S side.
  • the aperture stop 4 is disposed on the imaging surface S side with respect to the vertex of the first surface of the fourth lens L4, and on the object side with respect to the second surface of the fourth lens L4 in the rear group optical system 32.
  • Table 5 shows lens data of the second example.
  • Table 6 shows the refractive power of the lenses.
  • Table 7 shows values of the focal length of the entire system f, the F number Fno, the angle of view 2 ⁇ , the full length, and the composite focal length of the rear group optical system 32: fs, (r11 + r12) / (r11 -r12) , ⁇ d /f and fs /f.
  • Table 8 shows values of aspheric coefficients of the imaging lens 21.
  • FIG. 4 Aberrations in the second example are shown in FIG. 4. As can be seen from the aberration diagrams in FIG. 4, it is clear that the camera module 11 in the second example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size and wide in angle.
  • lens configurations of the front group optical system 31 and the rear group optical system 32 are different from those of the first and second examples.
  • the front group optical system 31 includes a first lens L1 having a negative refractive power with a concave surface facing the imaging surface S side.
  • the rear group optical system 32 includes a second lens L2 having a positive refractive power with a convex surface facing the object side, a third lens L3 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fourth lens L4 having a negative refractive power with concave surfaces facing the object side and the imaging surface S side, a fifth lens L5 having a positive refractive power with a convex surface facing the imaging surface S side, a sixth lens L6 having a positive refractive power with a convex surface facing the imaging surface S side and a seventh lens L7 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging surface S side.
  • the aperture stop 4 is disposed on the imaging surface S side with
  • Table 9 shows lens data of the third example.
  • Table 10 shows the refractive power of the lenses.
  • Table 11 shows values of the focal length of the entire system f, the F number Fno, the angle of view 2 ⁇ , the full length, and the composite focal length of the rear group optical system 32: fs, (r11 + r12) /(r11 -r12) , ⁇ d /f and fs /f.
  • Table 12 shows values of the aspheric coefficients of the imaging lens 21.
  • FIG. 6 Aberrations in the third example are shown in FIG. 6. As can be seen from the aberration diagrams in FIG. 6, it is clear that the camera module 11 in the third example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size and wide in angle.
  • the front group optical system 31 includes the first lens L1 having a negative refractive power with a concave surface facing the imaging surface S side.
  • the rear group optical system 32 includes a second lens L2 having a positive refractive power with a convex surface facing the object side, a third lens L3 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fourth lens L4 having a negative refractive power with concave surfaces facing the object side and the imaging surface S side, a fifth lens L5 having a positive refractive power with a convex surface facing the imaging surface S side, a sixth lens L6 having a positive refractive power with a convex surface facing the imaging surface S side and a seventh lens L7 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging surface S side.
  • the aperture stop 4 is disposed on the imaging surface S side with respect to the vertex of the first surface of the third lens L3, and on the object side with respect to the second surface of the third lens L3 in the rear group optical system 32.
  • Table 13 shows lens data of the fourth example.
  • Table 14 shows the refractive power of the lenses.
  • Table 15 shows values of the focal length of the entire system f, the F number Fno, the angle of view 2 ⁇ , the full length, and the composite focal length of the rear group optical system 32: fs, (r11 + r12) / (r11 -r12) , ⁇ d /f and fs /f.
  • Table 16 shows values of the aspheric coefficients of the imaging lens 21.
  • FIG. 8 Aberrations in the fourth example are shown in FIG. 8. As can be seen from the aberration diagrams in FIG. 8, it is clear that the camera module 11 in the fourth example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size and wide in angle.
  • the front group optical system 31 includes the first lens L1 having a negative refractive power with a concave surface facing the imaging surface S side.
  • the rear group optical system 32 includes a second lens L2 having a positive refractive power with a convex surface facing the object side, a third lens L3 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fourth lens L4 having a negative refractive power with concave surfaces facing the object side and the imaging surface S side, a fifth lens L5 having a positive refractive power with a convex surface facing the imaging surface S side, a sixth lens L6 having a positive refractive power with a convex surface facing the imaging surface S side and a seventh lens L7 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging surface S side.
  • the aperture stop 4 is disposed on the imaging surface S side with respect to the vertex of the first surface of the third lens L3, and on the object side with respect to the second surface of the third lens L3.
  • Table 17 shows lens data of the fifth example.
  • Table 18 shows the refractive power of the lenses.
  • Table 19 shows values of the focal length of the entire system f, the F number Fno, the angle of view 2 ⁇ , the full length, and the composite focal length of the rear group optical system 32: fs, (r11 + r12) / (r11 -r12) , ⁇ d /f and fs /f.
  • Table 20 shows values of aspheric coefficients of the imaging lens 21.
  • FIG. 10 Aberrations in the fifth example are shown in FIG. 10. As can be seen from the aberration diagrams in FIG. 10, it is clear that the camera module 11 in the fifth example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size and wide in angle.
  • first and second are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features.
  • a feature defined as “first” and “second” may comprise one or more of this feature.
  • a plurality of means “two or more than two” , unless otherwise specified.
  • the terms “mounted” , “connected” , “coupled” and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements which can be understood by those skilled in the art accordi ng to specific situations.
  • a structure in which a first feature is "on" or “below” a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are in contact via an additional feature formed therebetween.
  • a first feature "on” , “above” or “on top of” a second feature may include an embodiment in which the first feature is orthogonally or obliquely “on” , “above” or “on top of” the second feature, or just means that the first feature is at a height higher than that of the second feature; while a first feature “below” , “under” or “on bottom of” a second feature may include an embodiment in which the first feature is orthogonally or obliquely “below” , "under” or “on bottom of” the second feature, or just means that the first feature is at a height lower than that of the second feature.
  • Any process or method described in a flow chart or described herein in other ways may be understood to include one or more modules, segments or portions of codes of executable instructions for achieving specific logical functions or steps in the process, and the scope of a preferred embodiment of the present disclosure includes other implementations, in which it should be understood by those skilled in the art that functions may be implemented in a sequence other than the sequences shown or discussed, including in a substantially identical sequence or in an opposite sequence.
  • the logic and/or step described in other manners herein or shown in the flow chart may be specifically achieved in any computer readable medium to be used by the instructions execution system, device or equipment (such as a system based on computers, a system comprising processors or other systems capable of obtaining instructions from the instructions execution system, device and equipment executing the instructions) , or to be used in combination with the instructions execution system, device and equipment.
  • the computer readable medium may be any device adaptive for including, storing, communicating, propagating or transferring programs to be used by or in combination with the instruction execution system, device or equipment.
  • the computer readable medium comprise but are not limited to: an electronic connection (an electronic device) with one or more wires, a portable computer enclosure (a magnetic device) , a random access memory (RAM) , a read only memory (ROM) , an erasable programmable read-only memory (EPROM or a flash memory) , an optical fiber device and a portable compact disk read-only memory (CDROM) .
  • the computer readable medium may even be a paper or other appropriate medium capable of printing programs thereon, this is because, for example, the paper or other appropriate medium may be optically scanned and then edited, decrypted or processed with other appropriate methods when necessary to obtain the programs in an electric manner, and then the programs may be stored in the computer memories.
  • each part of the present disclosure may be realized by the hardware, software, firmware or their combination.
  • a plurality of steps or methods may be realized by the software or firmware stored in the memory and executed by the appropriate instructions execution system.
  • the steps or methods may be realized by one or a combination of the following techniques known in the art: a discrete logic circuit having a logic gate circuit for realizing a logic function of a data signal, an application-specific integrated circuit having an appropriate combination logic gate circuit, a programmable gate array (PGA) , a field programmable gate array (FPGA) , etc.
  • each function cell of the embodiments of the present disclosure may be integrated in a processing module, or these cells may be separate physical existence, or two or more cells are integrated in a processing module.
  • the integrated module may be realized in a form of hardware or in a form of software function modules. When the integrated module is realized in a form of software function module and is sold or used as a standalone product, the integrated module may be stored in a computer readable storage medium.
  • the storage medium mentioned above may be read-only memories, magnetic disks, CD, etc.

Abstract

An imaging lens includes a front group optical system disposed on an object side and a rear group optical system disposed on an imaging surface side, wherein the front group optical system includes at least one lens having a negative refractive power, the rear group optical system includes at least one lens having a positive refractive power, an aperture stop and at least one lens having a negative refractive power, the aperture stop being positioned on the imaging surface side with respect to a most object side positioned lens of the at least one lens having a positive refractive power, a most object side positioned lens being a lens having a negative refractive power and functioning as a lens protection filter, and a lens of the rear group optical system positioned on the most imaging surface side, has, on the imaging surface side, aspheric shape having an inflection point.

Description

IMAGING LENS, CAMERA MODULE AND IMAGING DEVICE FIELD
The present disclosure relates to an imaging lens, a camera module, and an imaging device, and more specifically, to an imaging lens, a camera module, and an imaging device that are small and enable good optical performance.
BACKGROUND
Conventionally, optical systems composed of, in order from an object side, a front group optical system having a negative refractive power and a rear group optical system having a positive refractive power are well known as imaging optical systems used in imaging devices such as in-vehicle cameras, surveillance cameras, video cameras, and electronic still cameras.
In recent years, portable imaging devices such as mobile phones and digital cameras have been widely used. With the recent miniaturization of imaging devices, imaging lenses mounted on the imaging devices also require downsizing.
Therefore, in order to mount a wide angle lens, which is an example of an imaging lens, on a small digital device such as a mobile phone or a sports camera, further downsizing is required. In addition, since the resolution of imaging elements mounted on imaging devices is also being improved, optical properties of the imaging lens mounted on the imaging devices also require improvements in order to accommodate the higher resolution of the imaging elements.
However, a compact wide angle lens, in which a back focus is sufficiently shortened and which provides excellent optical properties, has not been effectively proposed yet.
SUMMARY
The present disclosure aims to solve at least one of the technical problems mentioned above. Accordingly, the present disclosure needs to provide an imaging lens, a camera module, and an imaging device.
In accordance with the present disclosure, an imaging lens includes:
a front group optical system disposed on an object side; and
a rear group optical system disposed on an imaging surface side, wherein
the front group optical system includes at least one lens having a negative refractive power,
the rear group optical system includes at least one lens having a positive refractive power, an aperture stop and at least one lens having a negative refractive power,
the aperture stop is positioned on the imaging surface side with respect to a most object side positioned positive refractive power lens of the at least one lens having a positive refractive power,
a lens of the front group optical system, positioned on the most object side, in is a lens having a negative refractive power and functioning as a lens protection filter, and
a lens of the rear group optical system positioned on the most imaging surface side, has, on the imaging surface side, an aspheric shape having an inflection point.
In one example, the imaging lens may satisfy the following conditional expression:
0.5 < (r11 + r12) / (r11 –r12) < 2.5,
where r11 is a center radius of curvature of the object side surface of the most object side positioned lens of the front group optical system and r12 is a center radius of curvature of the imaging surface side surface of the most object side positioned lens of the front group optical system.
In one example, the imaging lens may satisfy the following conditional expression:
Σ d /f < 8.0,
where Σ d is a distance on an optical axis from a vertex of the object side surface of the most object side positioned lens of the front group optical system to an imaging surface and f is a focal length of an entire optical system including the front group optical system and the rear group optical system.
In one example, the imaging lens may satisfy the following conditional expression:
0.25 < fs /f < 5.0,
where fs is a composite focal length of the rear group optical system and f is a focal length of an entire optical system including the front group optical system and the rear group optical system.
In one example, the most imaging surface side positioned lens of the rear group optical system may be a lens having a negative refractive power.
In one example, a surface on a side of an imaging surface of the most imaging surface side positioned lens of the rear group optical system may have a concave shape near an optical axis and a convex shape in a peripheral area.
In one example, an angle of view of the imaging lens may be 100 degrees or more.
In one example, the most imaging surface side positioned lens of the rear group optical system may be formed of plastic.
In accordance with the present disclosure, a camera module includes:
the imaging lens; and
an image sensor including an imaging surface;
wherein the lens of the front group optical system, positioned on the most object side, is functioning as a lens protection filter and disposed on a housing of the camera module.
In accordance with the present disclosure, an imaging device includes the camera module.
BRIEF DESCRIPTION OF THE DRAWINGS
These and/or other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the drawings, in which:
FIG. 1 is a configuration diagram of a camera module according to a first example of the present disclosure;
FIG. 2 is an aberration diagram of the camera module according to the first example of the present disclosure;
FIG. 3 is a configuration diagram of a camera module according to a second example of the present disclosure;
FIG. 4 is an aberration diagram of the camera module according to the second example of the present disclosure;
FIG. 5 is a configuration diagram of a camera module according to a third example of the present disclosure;
FIG. 6 is an aberration diagram of the camera module according to the third example of the present disclosure;
FIG. 7 is a configuration diagram of a camera module according to a fourth example of the present disclosure;
FIG. 8 is an aberration diagram of the camera module according to the fourth example of the present disclosure;
FIG. 9 is a configuration diagram of a camera module according to a fifth example of the present disclosure, and
FIG. 10 is an aberration diagram of the camera module according to the fifth example of the present disclosure.
DETAILED DESCRIPTION
Embodiments of the present disclosure will be described in detail and examples of the embodiments will be illustrated in the accompanying drawings. The same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions. The embodiments described herein with reference to the drawings are explanatory and aim to illustrate the present disclosure, but shall not be construed to limit the present disclosure.
<Outline of the disclosure>
First, an outline of the present disclosure will be described. A camera module to which the present disclosure is applied is configured as shown in FIGS. 1, 3, 5, 7, and 9, for example. In the figures, dash –dot lines represent optical axes of the camera modules.
The camera module 11 includes an imaging lens 21, an optical filter 22 and an image sensor 23.
The imaging lens 21 is, for example, a super-wide-angle lens with an angle of 100 degrees or more. The imaging lens 21 includes a front group optical system 31 and a rear group optical system 32. The front group optical system 31 is an optical system whose position is fixed in a housing of the camera module 11. The rear group optical system 32 is an optical system which can be moved in the optical axis direction by an actuator located in the housing of the camera module 11. The rear group optical system 32 can be used for a focusing operation in which the imaging lens 21 is focused on a subject.
In the imaging lens 21, the front group optical system 31 and the rear group optical system 32 are disposed in order from an object side toward an imaging surface S side.
The front group optical system 31 includes at least one lens having a negative refractive power. The rear group optical system 32 includes at least one lens having a positive refractive power, an aperture stop 4 and at least one lens having a negative refractive power. That is, the aperture stop 4 is provided in the rear group optical system 32 and can be moved in the optical axis direction together with the lens of the rear group optical system 32, by means of the focusing operation. The aperture stop 4 is positioned on the imaging surface side with respect to a most object side positioned positive refractive power lens of the at least one lens having a positive refractive power.
The image sensor 23 is, for example, a solid-state image sensor such as a CMOS (Complementary Metal Oxide Semiconductor) or a CCD (Charge Coupled Device) . The image  sensor 23 has the imaging surface S which is an imaging plane of the imaging lens 21. The image sensor 23 receives light incident from the subject (object side) via the imaging lens 21 and the optical filter 22, it photoelectrically converts the light, and outputs an image data obtained by the photoelectric conversion of the light to a subsequent stage.
In order to obtain a small camera module having an imaging lens of good optical performance, it is preferable, for example, to appropriately correct chromatic aberrations of the imaging lens and shorten the back focus of the imaging lens.
So, in the camera module 11, the front group optical system 31 includes at least one lens having a negative refractive power; the rear group optical system 32 includes at least one lens having a positive refractive power and at least one lens having a negative refractive power; and the lens of the rear group optical system 32, positioned on the most imaging surface S side, has, on the imaging surface S side, an aspheric shape having an inflection point.
Since the front group optical system 31 includes at least one lens having a negative refractive power as described above, chromatic aberrations can be appropriately corrected and good optical performance can be obtained. In addition, light can be refracted sharply, and a total optical length can be shortened even when an angle of view is wide.
Further, in the camera module 11, since the rear group optical system 32 includes at least one lens having a positive refractive power and at least one lens having a negative refractive power; and the lens of the rear group optical system 32 positioned on the most imaging surface S side, has, on the imaging surface S side, an aspheric shape having an inflection point, it is possible to make part of the rear group optical system 32 to have a large negative refractive power in order to shorten the back focus of the imaging lens 21. In particular, if the most imaging surface S side positioned lens of the rear group optical system 32 has a negative refractive power, i.e. has negative optical power near the optical axis, it is suitable  for shortening the back focus.
Also, the most imaging surface S side positioned lens of the rear group optical system 32 has, on the imaging surface S side, an aspheric shape having an inflection point in the vicinity of the lens edge. Specifically, a surface on the side of the imaging surface S of the most imaging surface S side positioned lens of the rear group optical system 32 has a concave shape in the lens center (i.e. near the optical axis) and a convex shape in a peripheral area (i.e. in the vicinity of an outer peripheral area) .
A lens, positioned on the most object side, of the front group optical system 31 is a lens functioning as a lens protection filter. Such a lens can be realized, for example, by forming a transparent cover into a lens shape, the transparent cover being disposed on a housing of the camera module 11 on the optical axis so as to cover the inside of the housing.
Here, in a conventional camera module in which a cover glass (i.e. transparent cover) is disposed on the object side of the imaging lens, "vignetting" , in which light from the object incident on the peripheral side of the imaging lens at a large incident angle is blocked by the cover glass or a lens barrel, may occur. For this reason, in the conventional camera module, it has been difficult to realize a sufficiently wide angle. In contrast, in the camera module 11 of the present disclosure, a sufficiently wide angle lens in which "vignetting" is sufficiently suppressed can be realized by including a lens functioning as a lens protection filter instead of a conventional cover glass. Furthermore, the camera module 11 allows the miniaturization of the imaging lens 21 while maintaining a good optical performance of the imaging lens 21 by satisfying the following formula (1) :
0.5 < (r11 + r12) / (r11 –r12) < 2.5      (1)
In the formula (1) , r11 is a center radius of a curvature of the object side surface of the most object side positioned lens of the front group optical system 31 and r12 is a center radius of a curvature of the imaging surface S side surface of the most  object side positioned lens of the front group optical system 31.
As the ratio indicated in the formula (1) decreases, it is possible to more reliably miniaturize the imaging lens 21 while maintaining its good optical performance.
Furthermore, the imaging lens 21 may be further miniaturized when the camera module 11 satisfies the following formula (2) :
Σ d /f < 8.0      (2)
In the formula (2) , Σ d is a full length of the imaging lens 21, that is, a distance on the optical axis from a vertex of the object side surface of the most object side positioned lens to an imaging surface S; f is a focal length of an entire optical system including the front group optical system 31 and the rear group optical system 32 (the same applies hereinafter) .
As the ratio of the full length Σ d and the focal length f indicated in the formula (2) decreases, the imaging lens 21 becomes smaller. In particular, a sufficiently small ima ging lens 21 can be obtained when the ratio of the full length Σ d and the focal length f is less than 8.
For example, if the focal length f is a fixed value, the full length Σ d of the imaging lens 21 becomes shorter as the ratio of the full length Σ d and the focal length f decreases. Further, if the back focus of the imaging lens 21 is shortened, the full length Σ d of the imaging lens 21 is shortened accordingly.
More preferably, the ratio of the full length Σ d and the focal length f satisfies the following formula (2) ’:
Σ d /f < 7.0      (2) ’
Furthermore, the imaging lens 21 may be more reliably miniaturized and its good optical performance may be maintained when the camera module 11 satisfies the following formula (3) :
0.25 < fs /f < 5.0      (3)
In the formula (3) , fs is a composite focal length of the rear group optical system 32 (the same applies hereinafter) .
If the value of fs /f falls below the lower limit value of the formula (3) (i.e. 0.25) , the sensitivity of the decentering  error of the rear group optical system 32 becomes very high and the difficulty of manufacturing increases. On the other hand, if the value of fs /f exceeds the upper limit value of the formula (3) (i.e. 5.0) , a spherical aberration is overcorrected and it is difficult to maintain the optical performance.
Furthermore, in view of the lens forming, it is preferable that an aspheric lens in the imaging lens 21, particularly an aspheric lens of aspheric shape having an inflection point, is formed of a plastic material (glass material) . In addition, among the lenses which constitute the imaging lens 21, a lens having a size equal to or smaller than a specific size may be a lens formed of a plastic material, and a lens larger than the specific size may be a lens formed of a glass material. This is because it is difficult to form an aspheric lens or a relatively small lens using a glass material instead of a plastic material.
If the above conditions are satisfied, the imaging lens 21 having a small size and sufficient optical performance can be obtained even when the angle of view is 100 degrees or more.
In particular, the lens of the rear group optical system 32, positioned on the most imaging surface S side has, on the imaging surface S side, an aspheric shape having an inflection point, while the imaging lens 21 balances the chromatic aberrations between the front group optical system 31 and the rear group optical system 32. Thereby, the back focus can be further shortened, and the imaging lens 21 having a small size and good optical performance can be obtained.
Such a camera module 11 including the imaging lens 21 is applicable to compact digital devices (imaging devices) such as mobile phones, wearable cameras and surveillance cameras. <Configuration examples of the camera module>
Next, more specific examples to which the present disclosure is applied will be described. In the following examples, “Si” indicates the ordinal number of the i-th surface which sequentially increases from the object side toward the imaging surface S side. Optical elements of the corresponding surfaces are shown together with the corresponding surface  number “Si” . Denotations of “first surface” or “1st surface” indicate a surface on the object side of the lens, and denotations of “second surface” or “2nd surface” indicate a surface on the imaging surface S side of the lens. “Ri” indicates a central radius of curvature value (mm) of the i-th surface. In “Ri” , “E + i” indicates an exponential expression with a base of 10, i.e., "10 i " . For example, "1.00 E +18" indicates "1.00 × 10 18" . Such an exponential expression is also applied to an aspheric coefficient described later. “Di” indicates a value of a distance on the optical axis between the i-th surface and the (i + 1) -th surface (mm) . “Ndi” indicates a value of a refractive index at d-line (wavelength 587.6 nm) of the material of the optical element having the i-th surface. “νdi” indicates a value of the Abbe number at d-line of the material of the optical element having the i-th surface. “Fno” indicates an F number. “2 ω” indicates an angle of view.
The imaging lens 21 used in the following examples includes lenses having aspheric surfaces. The aspheric shape of the lens is defined by the following formula (4) :
Z = C ·h 2 / {1 + (1 -K ·C 2 ·h 2 )  1/2} + Σ An ·h n
                          (4)
(n = an integer greater than 3) .
In the formula (4) , Z is a depth of the aspheric surface. C is a paraxial curvature which is equal to 1 /R, h is a distance from the optical axis to a lens surface, K is an eccentricity (second-order aspheric coefficient) , and An is an nth-order aspheric coefficient.
[First example]
A first example in which specific numerical values are applied to the camera module 11 shown in FIG. 1 will be described.
In the first example, the front group optical system 31 includes a first lens L1 having a negative refractive power with a concave surface facing the imaging surface S side and a second lens L2 having a positive refractive power with a convex surface facing the imaging surface S side, in order from the object side  toward the imaging surface S side. The rear group optical system 32 includes a third lens L3 having a positive refractive power with a convex surface facing the object side, a fourth lens L4 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fifth lens L5 having a negative refractive power with a concave surface facing the imaging surface S side, a sixth lens L6 having a positive refractive power with a convex surface facing the imaging surface S side and a seventh lens L7 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging surface S side. In the rear group optical system 32, the aperture stop 4 is disposed on the imaging surface S side with respect to the vertex of the first surface of the fourth lens L4 and on the object side with respect to the second surface of the fourth lens L4.
Table 1 shows lens data of the first example. Table 2 shows the refractive power of the lenses. Table 3 shows values of the focal length of the entire system f, the F number Fno, the angle of view 2ω, the full length, and the composite focal length of the rear group optical system 32: fs, (r11 + r12) / (r11 -r12) , Σ d /f and fs /f. Table 4 shows values of the aspheric coefficients of the imaging lens 21.
TABLE 1
Si Ri Di Nd νd
1 (Virtual Surface)   1.00E+10    
2 (L1 1st Surface) 25.0000 0.6000 1.6469 58.44
3 (L1 2nd Surface) 1.7562 1.7070    
4 (L2 1st Surface) -3.5331 1.4403 1.5343 55.66
5 (L2 2nd Surface) -1.9876 0.1199    
6 (L3 1st Surface) 2.1443 0.6038 1.6107 35.51
7 (L3 2nd Surface) 1.9526 0.4473    
8 (Aperture Stop) 1.00E+18 -0.0200    
9 (L4 1st Surface) 1.5751 0.6000 1.5343 55.66
10 (L4 2nd Surface) -1.5003 0.0300    
11 (L5 1st Surface) 68.2455 0.3000 1.6424 18.95
12 (L5 2nd Surface) 1.4505 0.2273    
13 (L6 1st Surface) 25.2715 0.5138 1.5343 55.66
14 (L6 2nd Surface) -1.8793 0.2516    
15 (L7 1st Surface) -5.1799 0.4500 1.5343 55.66
16 (L7 2nd Surface) 2.4773 0.0434    
17 (Optical Filter) 1.00E+18 0.1100 1.5168 64.20
18 (Imaging Plane)   0.5779    
TABLE 2
Lens Refractive Power
L1 Negative
L2 Positive
L3 Positive
L4 Positive
L5 Negative
L6 Positive
L7 Negative
TABLE 3
f 1.3274
Fno 2.4033
2ω 164.6
Full Length 8.0024
fs 2.7674
(r11+r12) / (r11-r12) 1.1511
∑d/f 6.0286
fs/f 2.0848
TABLE 4
S2 S3 S4
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 0.000000000000000E+00 0.000000000000000E+00 -1.911043408074790E-02
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 0.000000000000000E+00 0.000000000000000E+00 6.119848829947400E-03
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 0.000000000000000E+00 0.000000000000000E+00 -1.728623233355910E-03
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S5 S6 S7
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 5.018413608393540E-02 -1.749565752561040E-02 -1.130559914396980E-01
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 -1.327355983745440E-02 2.458859868825680E-02 1.277357053695800E-01
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 2.714060486174280E-03 -1.405443087293290E-02 -3.143199794530790E-02
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S9 S10 S11
K 0.000000000000000E+00 0.000000000000000E+00 -1.000000000000000E+01
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 -9.847182575933280E-02 8.007026856081160E-02 -1.186845753543090E-01
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 -1.120214790674960E-01 -3.313977945585520E-01 1.809734538731670E-01
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 6.933037713097220E-02 1.532339906889390E-01 -4.157139774311170E-01
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 -8.375820067520630E-01 -5.111780101095970E-01 2.534340535635670E-01
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S12 S13 S14
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 -1.611873159257590E-01 6.371033184129980E-02 1.915881880537000E-01
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 3.215614287338210E-01 -1.301603434609860E-01 -1.445621413949080E-02
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -2.527617780309280E-01 4.950043162395670E-02 -5.641575462317510E-03
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 5.986192881508690E-02 -1.967146400724200E-02 -1.944289394893290E-03
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S15 S16
K 0.000000000000000E+00 0.000000000000000E+00
A3 -5.824960650456110E-02 -7.899577943179050E-02
A4 -9.597016896909940E-03 -1.691659667674190E-01
A5 3.229468096139420E-02 -9.811740028447620E-02
A6 -2.615380206094760E-01 3.058838003646320E-01
A7 8.349600652260650E-01 -1.296818505126680E-01
A8 -8.159327158937640E-01 -7.730890024776610E-02
A9 3.320662951480450E-01 7.384239136921180E-02
A10 -5.109416906142120E-02 -1.587416655503860E-02
A11 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00
Aberrations in the first example are shown in FIG. 2. FIG. 2 shows spherical aberration, astigmatism (field curvature) and distortion as examples of aberrations. Each of these  aberration diagrams shows aberrations with d-line (587.56 nm) as a reference wavelength. In the spherical aberration diagram, aberrations with respect to g-line (435.84 nm) and C-line (656.27 nm) are also shown. In the graph showing astigmatism, “S” indicates a value of aberration on a sagittal image surface and “T” indicates a value of aberration on a tangential image surface. The same applies to aberration diagrams in other examples.
As can be seen from the aberration diagrams mentioned above, it is clear that the camera module 11 in the first example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size and wide in angle.
[Second example]
Next, a second example in which specific numerical values are applied to the camera module 11 shown in FIG. 3 will be described. In the second example, lens configurations of the front group optical system 31 and the rear group optical system 32 are different from those of the first example.
Specifically, in the second example, the front group optical system 31 includes a first lens L1 having a negative refractive power with a concave surface facing the imaging surface S side, and a second lens L2 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging surface S side. The rear group optical system 32 includes a third lens L3 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fourth lens L4 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fifth lens L5 having a negative refractive power with concave surfaces facing the object side and the imaging surface S side, a sixth lens L6 having a negative refractive power and a seventh lens L7 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging surface S side. The aperture  stop 4 is disposed on the imaging surface S side with respect to the vertex of the first surface of the fourth lens L4, and on the object side with respect to the second surface of the fourth lens L4 in the rear group optical system 32.
Table 5 shows lens data of the second example. Table 6 shows the refractive power of the lenses. Table 7 shows values of the focal length of the entire system f, the F number Fno, the angle of view 2ω, the full length, and the composite focal length of the rear group optical system 32: fs, (r11 + r12) / (r11 -r12) , ∑ d /f and fs /f. Table 8 shows values of aspheric coefficients of the imaging lens 21.
TABLE 5
Si Ri Di Nd vd
1 (Virtual Surface)   1.00E+10    
2 (L1 1st Surface) 1.30E+01 0.9 1.6230 58.12
3 (L1 2nd Surface) 2.6999 0.9000    
4 (L2 1st Surface) 14.3736 0.6857 1.4875 70.44
5 (L2 2nd Surface) 1.3000 1.2167    
6 (L3 1st Surface) 1.78E+00 0.81142 1.5339 56.20
7 (L3 2nd Surface) -3.2356 0.30904    
8 (Aperture Stop) 1.00E+18 -0.02000    
9 (L4 1st Surface) 3.2981 0.73671 1.5339 56.20
10 (L4 2nd Surface) -1.0766 0.02500    
11 (L5 1st Surface) -4.4521 0.31000 1.6349 23.96
12 (L5 2nd Surface) 1.5298 0.64434    
13 (L6 1st Surface) 0.4228 0.40000 1.5339 56.20
14 (L6 2nd Surface) 0.2390 0.02000    
15 (L7 1st Surface) 2.7389 0.43383 1.5339 56.20
16 (L7 2nd Surface) 2.2888 0.19702    
17 (Optical Filter) 1.00E+18 0.11000 1.5168 64.20
18 (Imaging Plane)   0.52001    
TABLE 6
Lens Refractive Power
L1 Negative
L2 Negative
L3 Positive
L4 Positive
L5 Negative
L6 Negative
L7 Negative
TABLE 7
f 1.2459
Fno 2.4641
2ω 162.3
Full Length 8.1998
fs 0.9689
(r11+r12) / (r11-r12) 1.5242
∑d/f 6.5814
fs/f 0.7777
TABLE 8
S2 S3 S4
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S5 S6 S7
K 0.000000000000000E+00 -1.426481064242960E+00 2.095643952175020E-01
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 0.000000000000000E+00 -3.337807762826210E-02 -2.391996513233170E-02
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 0.000000000000000E+00 -3.737386170189720E-02 -1.423384822146510E-02
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 0.000000000000000E+00 -1.478213990929630E-03 -8.198738231112180E-04
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S9 S10 S11
K -5.691672939788710E-01 7.210931921912800E-01 9.142186923193580E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 2.065362247078310E-02 1.727867197121430E-01 -4.762506755360050E-01
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 -1.962622513023300E-01 -5.378791228539060E-01 -5.876572145765700E-02
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 5.265467778821660E-01 9.210164417228350E-01 -2.302874374257640E-01
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 -2.286588477863880E+00 -9.429417398754750E-01 -3.194843581301680E-01
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S12 S13 S14
K -1.006492142865310E+01 -1.540968466521260E+17 -1.079243904282780E+26
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 -5.945668779424970E-02 2.637651500025180E-02 1.338005000827000E-02
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 9.145971217176000E-02 -3.281330270372640E-03 -4.834522326318170E-03
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -5.526303975745670E-02 2.077765534975260E-04 2.395452689482560E-03
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 2.101584828356210E-02 -6.414535996826710E-04 -7.806689841526270E-04
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S15 S16
K -7.095558900653710E-01 -6.263943977104570E+00
A3 0.000000000000000E+00 0.000000000000000E+00
A4 -9.257499482769730E-02 -4.578304703307770E-02
A5 0.000000000000000E+00 0.000000000000000E+00
A6 2.830589870653260E-02 1.051903083757810E-02
A7 0.000000000000000E+00 0.000000000000000E+00
A8 -6.144583013171090E-03 -1.750102812379610E-03
A9 0.000000000000000E+00 0.000000000000000E+00
A10 4.664394523847530E-04 9.076048657977360E-06
A11 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00
Aberrations in the second example are shown in FIG. 4. As can be seen from the aberration diagrams in FIG. 4, it is clear that the camera module 11 in the second example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size and wide in angle.
[Third example]
Next, a third example in which specific numerical values are applied to the camera module 11 shown in FIG. 5 will be described. In the third example, lens configurations of the front group optical system 31 and the rear group optical system 32 are different from those of the first and second examples.
Specifically, in the third example, the front group optical system 31 includes a first lens L1 having a negative refractive  power with a concave surface facing the imaging surface S side. The rear group optical system 32 includes a second lens L2 having a positive refractive power with a convex surface facing the object side, a third lens L3 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fourth lens L4 having a negative refractive power with concave surfaces facing the object side and the imaging surface S side, a fifth lens L5 having a positive refractive power with a convex surface facing the imaging surface S side, a sixth lens L6 having a positive refractive power with a convex surface facing the imaging surface S side and a seventh lens L7 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging surface S side. In the rear group optical system 32, the aperture stop 4 is disposed on the imaging surface S side with respect to the vertex of the first surface of the third lens L3, and on the object side with respect to the second surface of the third lens L3.
Table 9 shows lens data of the third example. Table 10 shows the refractive power of the lenses. Table 11 shows values of the focal length of the entire system f, the F number Fno, the angle of view 2ω, the full length, and the composite focal length of the rear group optical system 32: fs, (r11 + r12) /(r11 -r12) , Σ d /f and fs /f. Table 12 shows values of the aspheric coefficients of the imaging lens 21.
TABLE 9
Si Ri Di Nd vd
1 (Virtual Surface)   1.00E+10    
2 (L1 1st Surface) 1.00E+20 0.8100 1.5432 56.00
3 (L1 2nd Surface) 1.4507 0.4792    
4 (L2 1st Surface) 3.6086 1.2197 1.6349 23.96
5 (L2 2nd Surface) 52.2094 0.6235    
6 (Aperture Stop) 1.00E+18 -0.0100    
7 (L3 1st Surface) 2.5539 0.8340 1.5432 56.00
8 (L3 2nd Surface) -1.6326 0.0500    
9 (L4 1st Surface) -6.6217 0.4000 1.6349 23.96
10 (L4 2nd Surface) 2.9616 0.1949    
11 (L5 1st Surface) -159.4114 0.6822 1.5432 56.00
12 (L5 2nd Surface) -2.2032 0.3177    
13 (L6 1st Surface) -1.7411 0.7569 1.5432 56.00
14 (L6 2nd Surface) -0.7743 0.1114    
15 (L7 1st Surface) 2.2668 0.4122 1.6349 23.96
16 (L7 2nd Surface) 0.7580 0.5335    
17 (Optical Filter) 1.00E+18 0.2100 1.5168 64.17
18 (Imaging Plane) 1.00E+18 0.3749    
TABLE 10
Lens Refractive Power
L1 Negative
L2 Positive
L3 Positive
L4 Negative
L5 Positive
L6 Positive
L7 Negative
TABLE 11
f 1.8696
Fno 2.4514
2ω 123.6
Full Length 8.0000
fs 2.1619
(r11+r12) / (r11-r12) 1.0000
∑d/f 4.2790
fs/f 1.1563
TABLE 12
S2 S3 S4
K -1.000000000000020E+01 -9.987051762007530E-01 1.735432231782580E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 7.153745281785700E-04 -4.869182839651330E-03 4.167850171064140E-03
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 0.000000000000000E+00 5.861825707048030E-03 9.859980891595030E-03
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 0.000000000000000E+00 3.020454012862070E-04 -1.679090301942470E-03
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 0.000000000000000E+00 1.123030116967220E-04 6.022530532695870E-04
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S5 S7 S8
K 1.000000000000000E+01 2.922561528763570E+00 2.100772783958140E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 7.385069945114340E-02 2.310756192305370E-02 5.502164090043410E-02
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 9.933336385057350E-03 -6.345817390839860E-02 2.313633888409920E-02
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 3.798104437712640E-03 6.037268806881570E-02 -5.748551657128290E-02
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 7.898409508244570E-03 -2.654672170401770E-01 -1.372021907550400E-01
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 1.622344000000000E-01
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S9 S10 S11
K 5.836067828689090E+00 -1.000000000000000E+01 -1.000000000000000E+01
A3 -2.090801267878550E-02 -5.045050142343070E-02 -4.476812922446770E-02
A4 -9.774040818806070E-02 -2.489484413215290E-02 -4.855365410171440E-02
A5 -8.009108764699900E-02 -2.912166437345990E-04 -3.291577512737500E-02
A6 8.732583592193970E-02 5.424770423391300E-02 6.974936780234440E-02
A7 5.715718477694140E-02 3.317625802763000E-02 -1.368468253419310E-02
A8 -1.424821255854550E-01 -6.063771484793940E-02 -2.922914668794230E-02
A9 -1.054112204447500E-01 -2.172420841370230E-02 -5.322619206845800E-03
A10 -2.265625976725400E-02 3.745584593513030E-02 2.567657562749800E-02
A11 -4.635163256798860E-02 0.000000000000000E+00 -5.239186783485630E-03
A12 1.125298399439310E-01 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S12 S13 S14
K -1.000000000000790E+01 -1.000000000000000E+01 -4.070351788052040E+00
A3 -1.699355299231500E-02 -5.402213342779730E-02 1.900191017594150E-02
A4 -1.549401490049370E-01 4.241722947394460E-02 -8.626188748915480E-02
A5 5.648599195444240E-02 -8.263187600499540E-02 8.297646199053820E-02
A6 -9.681406597806270E-03 7.243187380840280E-02 1.708645807809280E-02
A7 -1.884359414306090E-02 1.966316978321970E-02 -1.517138216609750E-02
A8 1.412047228822560E-02 -2.176579330010780E-02 -6.756163339381120E-03
A9 1.613764522520280E-02 -1.705582106870640E-02 1.982517104199090E-04
A10 7.466783464809630E-03 3.913850984882160E-03 1.549308269527630E-04
A11 -8.338110688788520E-03 4.988936997260960E-03 6.128195513700030E-04
A12 -1.186054524004940E-02 -7.596326428726720E-04 4.319199498951410E-05
A13 -1.810163826414770E-02 -1.852676386658920E-05 2.431376740240620E-05
A14 1.011464970884260E-02 1.041780058397580E-05 2.254960885987560E-06
A15 2.077784630551940E-02 3.211968483521490E-05 -3.489788844102380E-06
A16 -1.080086582171470E-02 2.617267421270500E-05 -3.207645343748020E-06
A17 0.000000000000000E+00 1.502322347953370E-05 -1.675645330534060E-06
A18 0.000000000000000E+00 4.403749652697920E-06 -8.214828480018500E-07
A19 0.000000000000000E+00 -6.185004128608600E-06 -8.273775952112970E-08
A20 0.000000000000000E+00 -9.325602297023530E-06 1.682433546646690E-07
S15 S16
K -8.834872000000000E-01 -6.285399300000000E+00
A3 9.820800000000000E-03 5.328640000000000E-02
A4 -7.358360000000000E-02 -5.860240000000000E-02
A5 -3.251000000000000E-03 8.639100000000000E-03
A6 1.219390000000000E-02 -1.440100000000000E-03
A7 -1.347000000000000E-03 2.054500000000000E-03
A8 -3.882000000000000E-04 -5.841000000000000E-04
A9 -6.252548600000000E-05 1.751848800000000E-05
A10 -2.679676400000000E-05 2.213117700000000E-05
A11 1.582728100000000E-05 -1.403615500000000E-05
A12 1.770422400000000E-05 -4.012046700000000E-06
A13 -2.572107800000000E-06 -1.182130000000000E-06
A14 -1.011506400000000E-06 4.302953300000000E-08
A15 0.000000000000000E+00 5.512435900000000E-07
A16 0.000000000000000E+00 3.627674100000000E-07
A17 0.000000000000000E+00 -9.826418100000000E-08
A18 0.000000000000000E+00 -3.229425600000000E-08
A19 0.000000000000000E+00 -1.594033800000000E-10
A20 0.000000000000000E+00 1.984375800000000E-09
Aberrations in the third example are shown in FIG. 6. As can be seen from the aberration diagrams in FIG. 6, it is clear that the camera module 11 in the third example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size and wide in angle.
[Fourth example]
A fourth example in which specific numerical values are applied to the camera module 11 shown in FIG. 7 will be described. Similarly to the third example, in the fourth example, the front group optical system 31 includes the first lens L1 having a negative refractive power with a concave surface facing the imaging surface S side. The rear group optical system 32 includes a second lens L2 having a positive refractive power with a convex surface facing the object side, a third lens L3 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fourth lens L4 having a negative refractive power with concave surfaces facing the object side and the imaging surface S side, a fifth lens L5 having a positive refractive power with a convex surface facing the imaging surface S side, a sixth lens L6 having a positive refractive power with a convex surface facing the imaging surface S side and a seventh lens L7 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging  surface S side. The aperture stop 4 is disposed on the imaging surface S side with respect to the vertex of the first surface of the third lens L3, and on the object side with respect to the second surface of the third lens L3 in the rear group optical system 32. Table 13 shows lens data of the fourth example. Table 14 shows the refractive power of the lenses. Table 15 shows values of the focal length of the entire system f, the F number Fno, the angle of view 2ω, the full length, and the composite focal length of the rear group optical system 32: fs, (r11 + r12) / (r11 -r12) , ∑ d /f and fs /f. Table 16 shows values of the aspheric coefficients of the imaging lens 21.
TABLE 13
Si Ri Di Nd vd
1 (Virtual Surface)   1.00E+10    
2 (L1 1st Surface) 200.0000 0.8100 1.5432 56.00
3 (L1 2nd Surface) 1.3369 0.9399    
4 (L2 1st Surface) 3.5154 0.8629 1.6349 23.96
5 (L2 2nd Surface) -30.9997 0.6054    
6 (Aperture Stop) 1.00E+18 -0.0100    
7 (L3 1st Surface) 2.9116 0.8477 1.5432 56.00
8 (L3 2nd Surface) -1.5726 0.0500    
9 (L4 1st Surface) -4.8077 0.4000 1.6349 23.96
10 (L4 2nd Surface) 2.6616 0.0984    
11 (L5 1st Surface) 9.7336 0.8245 1.5432 56.00
12 (L5 2nd Surface) -2.7523 0.0721    
13 (L6 1st Surface) -2.3204 0.7361 1.5432 56.00
14 (L6 2nd Surface) -0.8630 0.0281    
15 (L7 1st Surface) 2.1433 0.4161 1.6349 23.96
16 (L7 2nd Surface) 0.7938 0.5248    
17 (Optical Filter) 1.00E+18 0.2100 1.5168 64.17
18 (Imaging Plane)   0.5841    
TABLE 14
Lens Refractive Power
L1 Negative
L2 Positive
L3 Positive
L4 Negative
L5 Positive
L6 Positive
L7 Negative
TABLE 15
f 1.7391
Fno 2.4671
2ω 152.8
Full Length 8.0000
fs 2.1112
(r11+r12) / (r11-r12) 1.0135
∑d/f 4.6001
fs/f 1.2140
TABLE 16
S2 S3 S4
K -1.000000000000020E+01 -9.987051762007530E-01 -1.810347167663190E-01
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 -1.265100000000000E-03 5.387877036173740E-04 -4.683292799167170E-03
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 9.068344000000050E-05 -1.512073383112840E-03 4.939922383529630E-03
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.298880400000000E-06 -3.600234640035140E-04 1.823407650884590E-04
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 -2.078328100000000E-07 3.372268145761420E-05 -5.567404504155170E-05
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S5 S7 S8
K 1.000000000000000E+01 2.181361098608220E-01 1.933430954770980E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 2.849758097041470E-02 6.412483773901190E-05 3.531744355812450E-02
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 2.950938850760680E-03 -1.199458139688920E-01 -4.247372529259700E-02
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 2.666417364582160E-03 2.267292782103920E-01 -4.429017804155380E-02
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 -1.494900759737030E-03 -6.207692860959110E-01 -9.947573013291400E-02
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 1.622344000000000E-01
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S9 S10 S11
K 1.735941871422080E+01 -1.000000000000000E+01 -1.000000000000000E+01
A3 -1.172349574819490E-02 -3.628369260200860E-02 -1.145940697867070E-02
A4 -1.100952085076980E-01 -2.229494838671710E-02 -2.684318656654830E-02
A5 -6.095351307723470E-02 -6.607074119237070E-03 -2.601970547733150E-02
A6 9.440974122098410E-02 5.288936158498220E-02 7.127502362350360E-02
A7 3.952186377818000E-02 3.412611813344530E-02 -1.212657597239370E-02
A8 -1.659356801226240E-01 -6.157349608933860E-02 -2.903434251215050E-02
A9 -1.095548797123990E-01 -2.482564976183630E-02 -6.846020521203180E-03
A10 7.654842209376670E-03 3.657363155874460E-02 2.489236685239480E-02
A11 1.891869528574020E-03 0.000000000000000E+00 -9.079889311319630E-04
A12 1.182107497927120E-01 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S12 S13 S14
K -1.000000000000790E+01 -1.000000000000000E+01 -5.031468391393800E+00
A3 2.986295641753160E-02 -2.083717942592840E-02 1.646308894326660E-02
A4 -1.248460171048860E-01 5.832567434664610E-02 -6.246799245757300E-02
A5 6.301225073671200E-02 -7.807893574147230E-02 8.448121750248510E-02
A6 -1.247746081635200E-02 7.232934570546320E-02 1.717756148459940E-02
A7 -1.980083715195850E-02 1.824706173521460E-02 -1.520306699942680E-02
A8 1.652512750038330E-02 -2.288559315627660E-02 -6.833345444643280E-03
A9 1.902157245377290E-02 -1.751481437111840E-02 -1.301040781858700E-05
A10 9.274099674804160E-03 3.876264557570060E-03 -1.920506132890850E-05
A11 -7.858195744863730E-03 5.098107880944090E-03 5.197509814183390E-04
A12 -1.217097767295380E-02 -6.958503025787910E-04 6.748702304300810E-06
A13 -1.867185505284270E-02 3.008077332157400E-06 1.465203625339120E-05
A14 9.629563397444840E-03 -1.970283906325950E-05 3.158191623617830E-06
A15 2.053254669058340E-02 -1.233177357859090E-05 1.172459095782470E-06
A16 -1.075551675041170E-02 -8.867078453820570E-06 3.595663900245830E-07
A17 0.000000000000000E+00 -7.056445097495670E-06 -1.718810815493640E-08
A18 0.000000000000000E+00 -4.647908562054580E-06 -1.764905568833210E-07
A19 0.000000000000000E+00 -3.353193999579260E-06 -1.808735592760380E-07
A20 0.000000000000000E+00 -4.488361548859220E-07 -1.508941530043910E-07
S15 S16
K -8.834872000000000E-01 -6.285399300000000E+00
A3 9.820800000000000E-03 5.328640000000000E-02
A4 -7.358360000000000E-02 -5.860240000000000E-02
A5 -3.251000000000000E-03 8.639100000000000E-03
A6 1.219390000000000E-02 -1.440100000000000E-03
A7 -1.347000000000000E-03 2.054500000000000E-03
A8 -3.882000000000000E-04 -5.841000000000000E-04
A9 -6.252548600000000E-05 1.751848800000000E-05
A10 -2.679676400000000E-05 2.213117700000000E-05
A11 1.582728100000000E-05 -1.403615500000000E-05
A12 1.770422400000000E-05 -4.012046700000000E-06
A13 -2.572107800000000E-06 -1.182130000000000E-06
A14 -1.011506400000000E-06 4.302953300000000E-08
A15 0.000000000000000E+00 5.512435900000000E-07
A16 0.000000000000000E+00 3.627674100000000E-07
A17 0.000000000000000E+00 -9.826418100000000E-08
A18 0.000000000000000E+00 -3.229425600000000E-08
A19 0.000000000000000E+00 -1.594033800000000E-10
A20 0.000000000000000E+00 1.984375800000000E-09
Aberrations in the fourth example are shown in FIG. 8. As can be seen from the aberration diagrams in FIG. 8, it is clear that the camera module 11 in the fourth example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size and wide in angle.
[Fifth example]
Next, a fifth example in which specific numerical values are applied to the camera module 11 shown in FIG. 9, will be described. Similarly to the third example, in the fifth example, the front group optical system 31 includes the first lens L1 having a negative refractive power with a concave surface facing the imaging surface S side. The rear group optical system 32 includes a second lens L2 having a positive  refractive power with a convex surface facing the object side, a third lens L3 having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, a fourth lens L4 having a negative refractive power with concave surfaces facing the object side and the imaging surface S side, a fifth lens L5 having a positive refractive power with a convex surface facing the imaging surface S side, a sixth lens L6 having a positive refractive power with a convex surface facing the imaging surface S side and a seventh lens L7 having a negative refractive power with a concave surface facing the imaging surface S side, in order from the object side toward the imaging surface S side. The aperture stop 4 is disposed on the imaging surface S side with respect to the vertex of the first surface of the third lens L3, and on the object side with respect to the second surface of the third lens L3. Table 17 shows lens data of the fifth example. Table 18 shows the refractive power of the lenses. Table 19 shows values of the focal length of the entire system f, the F number Fno, the angle of view 2ω, the full length, and the composite focal length of the rear group optical system 32: fs, (r11 + r12) / (r11 -r12) , Σ d /f and fs /f. Table 20 shows values of aspheric coefficients of the imaging lens 21.
TABLE 17
Si Ri Di Nd νd
1 (Virtual Surface)   1.00E+10    
2 (L1 1st Surface) 1.00E+18 0.8100 1.5168 64.17
3 (L1 2nd Surface) 1.3957 0.7385    
4 (L2 1st Surface) 3.6633 1.0328 1.6349 23.96
5 (L2 2nd Surface) 34.3633 0.5736    
6 (Aperture Stop)  1.00E+18 -0.0100    
7 (L3 1st Surface) 2.4710 0.9338 1.5432 56.00
8 (L3 2nd Surface) -1.5661 0.0500    
9 (L4 1st Surface) -4.7636 0.4000 1.6349 23.96
10 (L4 2nd Surface) 3.1443 0.1552    
11 (L5 1st Surface) 10.8615 0.7688 1.5432 56.00
12 (L5 2nd Surface) -2.6963 0.1628    
13 (L6 1st Surface) -1.9168 0.7839 1.5432 56.00
14 (L6 2nd Surface) -0.7828 0.0535    
15 (L7 1st Surface) 2.2485 0.4451 1.6349 23.96
16 (L7 2nd Surface) 0.7358 0.5362    
17 (Optical Filter) 1.00E+18 0.2100 1.5168 64.17
18 (Imaging Plane)   0.3558    
TABLE 18
Lens Refractive Power
L1 Negative
L2 Positive
L3 Positive
L4 Negative
L5 Positive
L6 Positive
L7 Negative
TABLE 19
f 1.7633
Fno 2.4096
2ω 134.5
Full Length 8.0000
fs 2.0971
(r11+r12) / (r11-r12) 1.0000
∑d/f 4.5369
fs/f 1.1893
TABLE 20
S2 S3 S4
K 0.000000000000000E+00 -1.012501537660640E+00 1.203393953043420E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 0.000000000000000E+00 -1.191809661148940E-04 9.194115328094040E-03
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 0.000000000000000E+00 -1.710298521836980E-03 6.628229388505000E-03
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 0.000000000000000E+00 -3.614183486638790E-04 -7.144379659603080E-04
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 0.000000000000000E+00 5.864051093151640E-05 5.788753364429910E-04
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S5 S7 S8
K 1.000000000000000E+01 2.439128869964770E+00 1.800512114568970E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 7.788734065215300E-02 1.676160386925670E-02 1.500707416392360E-02
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 8.441841482710490E-03 -6.775748684994800E-02 1.293193718606950E-03
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 1.210329809815730E-02 7.367534493416550E-02 -1.845550221189860E-02
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 8.335233446088110E-03 -3.546996938787340E-01 -1.604438435718350E-01
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 0.000000000000000E+00 0.000000000000000E+00 1.622344000000000E-01
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S9 S10 S11
K 1.235805071546160E+01 -1.000000000000000E+01 -1.000000000000000E+01
A3 -2.110697495798610E-02 -6.198890211338680E-02 -5.657553791149140E-02
A4 -9.519965855572380E-02 -1.968134082620840E-02 -5.645721070471630E-02
A5 -7.825415425777500E-02 6.036913445024880E-03 -3.074369757849220E-02
A6 7.869985989247040E-02 5.713651107190250E-02 8.095324548105090E-02
A7 4.167773345417170E-02 3.201938002470340E-02 1.633421009151880E-03
A8 -1.527940311714350E-01 -6.402508202763690E-02 -1.741448567536110E-02
A9 -9.959773473014410E-02 -2.418114333612840E-02 -1.615219566983570E-03
A10 -3.455744301658520E-03 4.033684266077380E-02 2.055871576705730E-02
A11 -3.320849891719550E-02 0.000000000000000E+00 -1.623605703072490E-02
A12 6.991250560839450E-02 0.000000000000000E+00 0.000000000000000E+00
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A15 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A16 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A17 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A18 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A19 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A20 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
S12 S13 S14
K -1.000000000000790E+01 -1.000000000000000E+01 -4.357809389322020E+00
A3 1.117174005817750E-02 -1.584106341445840E-02 3.260019396775830E-02
A4 -1.194409357342880E-01 6.192576287395290E-02 -7.960773082394200E-02
A5 6.198916292620920E-02 -7.422525864565310E-02 8.282516510424040E-02
A6 -1.171820783922330E-02 7.253485272396800E-02 1.697078518648840E-02
A7 -1.787486663869950E-02 1.772257788643560E-02 -1.530972748398100E-02
A8 1.774201257664140E-02 -2.356072450348600E-02 -6.860776672520920E-03
A9 1.925366973382810E-02 -1.805153082511750E-02 1.111640337541160E-05
A10 8.957593242999670E-03 3.653028868858120E-03 1.296485236573290E-05
A11 -8.357770584206050E-03 5.008894534010320E-03 5.468205596116780E-04
A12 -1.262825690260780E-02 -7.308291257157480E-04 2.145181042673630E-05
A13 -1.899646822614490E-02 2.177777165660760E-05 1.948049188958220E-05
A14 9.437956800853720E-03 1.266680289992500E-05 4.791200558704900E-06
A15 2.045361312069030E-02 2.593761783766950E-05 1.456151923350300E-06
A16 -1.075229043971080E-02 1.712589353776240E-05 8.773892693587690E-08
A17 0.000000000000000E+00 9.468283603197430E-06 -2.024887670161480E-07
A18 0.000000000000000E+00 -3.960985380132090E-07 -2.979841524075600E-07
A19 0.000000000000000E+00 -4.707079628314520E-06 -1.675385520399170E-07
A20 0.000000000000000E+00 -4.698311433170090E-06 -1.201437081712660E-07
S15 S16
K -8.834872000000000E-01 -6.285399300000000E+00
A3 9.820800000000000E-03 5.328640000000000E-02
A4 -7.358360000000000E-02 -5.860240000000000E-02
A5 -3.251000000000000E-03 8.639100000000000E-03
A6 1.219390000000000E-02 -1.440100000000000E-03
A7 -1.347000000000000E-03 2.054500000000000E-03
A8 -3.882000000000000E-04 -5.841000000000000E-04
A9 -6.252548600000000E-05 1.751848800000000E-05
A10 -2.679676400000000E-05 2.213117700000000E-05
A11 1.582728100000000E-05 -1.403615500000000E-05
A12 1.770422400000000E-05 -4.012046700000000E-06
A13 -2.572107800000000E-06 -1.182130000000000E-06
A14 -1.011506400000000E-06 4.302953300000000E-08
A15 0.000000000000000E+00 5.512435900000000E-07
A16 0.000000000000000E+00 3.627674100000000E-07
A17 0.000000000000000E+00 -9.826418100000000E-08
A18 0.000000000000000E+00 -3.229425600000000E-08
A19 0.000000000000000E+00 -1.594033800000000E-10
A20 0.000000000000000E+00 1.984375800000000E-09
Aberrations in the fifth example are shown in FIG. 10. As can be seen from the aberration diagrams in FIG. 10, it is clear that the camera module 11 in the fifth example can  satisfactorily correct various aberrations to obtain superior optical performance despite being small in size and wide in angle.
In the description of embodiments of the present disclosure, it is to be understood that terms such as "central" , "longitudinal" , "transverse" , "length" , "width" , "thickness" , "upper" , "lower" , "front" , "rear" , "back" , "left" , "right" , "vertical" , "horizontal" , "top" , "bottom" , "inner" , "outer" , "clockwise" and "counterclockwise" should be construed to refer to the orientation or the position as described or as shown in the drawings in discussion. These relative terms are only used to simplify the description of the present disclosure, and do not indicate or imply that the device or element referred to must have a particular orientation, or must be constructed or operated in a particular orientation. Thus, these terms cannot be constructed to limit the present disclosure.
In addition, terms such as "first" and "second" are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features. Thus, a feature defined as "first" and "second" may comprise one or more of this feature. In the description of the present disclosure, "a plurality of" means “two or more than two” , unless otherwise specified.
In the description of embodiments of the present disclosure, unless specified or limited otherwise, the terms "mounted" , "connected" , "coupled" and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements which can be understood by those skilled in the art accordi ng to specific situations.
In the embodiments of the present disclosure, unless specified or limited otherwise, a structure in which a first feature is "on" or "below" a second feature may include an  embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are in contact via an additional feature formed therebetween. Furthermore, a first feature "on" , "above" or "on top of" a second feature may include an embodiment in which the first feature is orthogonally or obliquely "on" , "above" or "on top of" the second feature, or just means that the first feature is at a height higher than that of the second feature; while a first feature "below" , "under" or "on bottom of" a second feature may include an embodiment in which the first feature is orthogonally or obliquely "below" , "under" or "on bottom of" the second feature, or just means that the first feature is at a height lower than that of the second feature.
Various embodiments and examples are provided in the above description to implement different structures of the present disclosure. In order to simplify the present disclosure, certain elements and settings are described in the above. However, these elements and settings are only by way of example and are not intended to limit the present disclosure. In addition, reference numbers and/or reference letters may be repeated in different examples in the present disclosure. This repetition is for the purpose of simplification and clarity and does not refer to relations between different embodiments and/or settings. Furthermore, examples of different processes and materials are provided in the present disclosure. However, it would be appreciated by those skilled in the art that other processes and/or materials may also be applied.
Reference throughout this specification to "an embodiment" , "some embodiments" , "an exemplary embodiment" , "an example" , "a specific example" or "some examples" means that a particular feature, structure, material, or characteristics described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the above  phrases throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
Any process or method described in a flow chart or described herein in other ways may be understood to include one or more modules, segments or portions of codes of executable instructions for achieving specific logical functions or steps in the process, and the scope of a preferred embodiment of the present disclosure includes other implementations, in which it should be understood by those skilled in the art that functions may be implemented in a sequence other than the sequences shown or discussed, including in a substantially identical sequence or in an opposite sequence.
The logic and/or step described in other manners herein or shown in the flow chart, for example, a particular sequence table of executable instructions for realizing the logical function, may be specifically achieved in any computer readable medium to be used by the instructions execution system, device or equipment (such as a system based on computers, a system comprising processors or other systems capable of obtaining instructions from the instructions execution system, device and equipment executing the instructions) , or to be used in combination with the instructions execution system, device and equipment. As to the specification, "the computer readable medium" may be any device adaptive for including, storing, communicating, propagating or transferring programs to be used by or in combination with the instruction execution system, device or equipment. More specific examples of the computer readable medium comprise but are not limited to: an electronic connection (an electronic device) with one or more wires, a portable computer enclosure (a magnetic device) , a random access memory (RAM) , a read only memory (ROM) , an erasable programmable read-only memory (EPROM or a flash memory) , an optical fiber device and a portable compact disk read-only  memory (CDROM) . In addition, the computer readable medium may even be a paper or other appropriate medium capable of printing programs thereon, this is because, for example, the paper or other appropriate medium may be optically scanned and then edited, decrypted or processed with other appropriate methods when necessary to obtain the programs in an electric manner, and then the programs may be stored in the computer memories.
It should be understood that each part of the present disclosure may be realized by the hardware, software, firmware or their combination. In the above embodiments, a plurality of steps or methods may be realized by the software or firmware stored in the memory and executed by the appropriate instructions execution system. For example, if it is realized by the hardware, likewise in another embodiment, the steps or methods may be realized by one or a combination of the following techniques known in the art: a discrete logic circuit having a logic gate circuit for realizing a logic function of a data signal, an application-specific integrated circuit having an appropriate combination logic gate circuit, a programmable gate array (PGA) , a field programmable gate array (FPGA) , etc.
Those skilled in the art shall understand that all or parts of the steps in the above exemplifying method of the present disclosure may be achieved by commanding the related hardware with programs. The programs may be stored in a computer readable storage medium, and the programs comprise one or a combination of the steps in the method embodiments of the present disclosure when run on a computer.
In addition, each function cell of the embodiments of the present disclosure may be integrated in a processing module, or these cells may be separate physical existence, or two or more cells are integrated in a processing module. The integrated module may be realized in a form of hardware or in a form of software function modules. When the integrated module is realized in a form of software function module and is sold or used as a standalone product, the integrated module may be  stored in a computer readable storage medium.
The storage medium mentioned above may be read-only memories, magnetic disks, CD, etc.
Although embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that the embodiments are explanatory and cannot be construed to limit the present disclosure, and changes, modifications, alternatives and variations can be made in the embodiments without departing from the scope of the present disclosure.

Claims (10)

  1. An imaging lens comprising:
    a front group optical system disposed on an object side; and
    a rear group optical system disposed on an imaging surface side, wherein
    the front group optical system comprises at least one lens having a negative refractive power,
    the rear group optical system comprises at least one lens having a positive refractive power, an aperture stop and at least one lens having a negative refractive power,
    the aperture stop is positioned on the imaging surface side with respect to a most object side positioned positive refractive power lens of the at least one lens having a positive refractive power,
    a lens of the front group optical system, positioned on the most object side, is a lens having a negative refractive power and functioning as a lens protection filter, and
    a lens of the rear group optical system, positioned on the most imaging surface side, has, on the imaging surface side, an aspheric shape having an inflection point.
  2. The imaging lens according to claim 1, wherein the imaging lens satisfies the following conditional expression,
    0.5 < (r11 + r12) / (r11 –r12) < 2.5,
    where r11 is a center radius of curvature of the object side surface of the most object side positioned lens of the front group optical system and r12 is a center radius of curvature of the imaging surface side surface of the most object side positioned lens of the front group optical system.
  3. The imaging lens according to claim 1, wherein the imaging lens satisfies the following conditional expression:
    Σ d /f < 8.0,
    where Σ d is a distance on an optical axis from a vertex  of the object side surface of the most object side positioned lens of the front group optical system to an imaging surface and f is a focal length of an entire optical system comprising the front group optical system and the rear group optical system.
  4. The imaging lens according to claim 1, wherein the imaging lens satisfies the following conditional expression:
    0.25 < fs /f < 5.0,
    where fs is a composite focal length of the rea r group optical system and f is a focal length of an entire optical system comprising the front group optical system and the rear group optical system.
  5. The imaging lens according to claim 1, wherein the most imaging surface side positioned lens of the rear group optical system is a lens having a negative refractive power.
  6. The imaging lens according to claim 1, wherein a surface on a side of an imaging surface of the most imaging surface side positioned lens of the rear group optical system has a concave shape near an optical axis and a convex shape in a peripheral area.
  7. The imaging lens according to claim 1, wherein an angle of view of the imaging lens is 100 degrees or more.
  8. The imaging lens according to claim 1, wherein the most imaging surface side positioned lens of the rear group optical system is formed of plastic.
  9. A camera module comprising:
    an imaging lens according to any one of claims 1-8; and
    an image sensor comprising an imaging surface;
    wherein the lens of the front group optical system, positioned on the most object side, is functioning as a lens protection filter and disposed on a housing of the camera  module.
  10. An imaging device comprising a camera module according to claim 9.
PCT/CN2020/075130 2020-02-13 2020-02-13 Imaging lens, camera module and imaging device WO2021159406A1 (en)

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CN117434695B (en) * 2023-12-20 2024-03-08 协益电子（苏州）有限公司 Front-view optical lens, imaging device and driving tool with same

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