WO2023000142A1 - Imaging lens assembly, camera module and imaging device - Google Patents

Imaging lens assembly, camera module and imaging device Download PDF

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Publication number
WO2023000142A1
WO2023000142A1 PCT/CN2021/107170 CN2021107170W WO2023000142A1 WO 2023000142 A1 WO2023000142 A1 WO 2023000142A1 CN 2021107170 W CN2021107170 W CN 2021107170W WO 2023000142 A1 WO2023000142 A1 WO 2023000142A1
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WO
WIPO (PCT)
Prior art keywords
lens group
focal length
lens
imaging
optical axis
Prior art date
Application number
PCT/CN2021/107170
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.)
Filing date
Publication date
Application filed by Guangdong Oppo Mobile Telecommunications Corp., Ltd. filed Critical Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority to CN202180096010.8A priority Critical patent/CN117063479A/en
Priority to PCT/CN2021/107170 priority patent/WO2023000142A1/en
Publication of WO2023000142A1 publication Critical patent/WO2023000142A1/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
    • G02B13/004—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 four lenses
    • 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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror

Definitions

  • the present disclosure relates to an imaging lens assembly, a camera module, and an imaging device, and more specifically, to an imaging lens assembly, a camera module, and an imaging device which are small and enable good optical performance.
  • a conventional imaging lens assembly secures a focal length of the imaging lens assembly within a restricted space by employing a prism positioned on an object side of a lens group.
  • 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 assembly, a camera module, and an imaging device.
  • an imaging lens assembly includes:
  • a third lens group for shooting at the first focal length and the second focal length
  • the first lens group is configured to change its position in an optical axis direction between a first shooting state, where shooting at the first focal length is performed, and a lens storage state, and between a second shooting state, where shooting at the second focal length is performed, and the lens storage state, and
  • the mirror is configured to form an optical path optically connecting the first lens group and the third lens group in the first shooting state, not to obstruct an optical path optically connecting the prism, the second lens group and the third lens group in the second shooting state, and to secure a storage space for the first lens group in the lens storage state.
  • a camera module includes:
  • an image sensor including an imaging surface.
  • an imaging device includes:
  • a housing for storing the imaging lens assembly.
  • FIG. 1A is a diagram of a camera module according to the present disclosure illustrating a first lens group which changes its position in the optical axis direction between a first shooting state or a second shooting state and a lens storage state, and a mirror which changes its angle with respect to the optical axis directions between the first shooting state and the lens storage state;
  • FIG. 1B is a diagram of a camera module according to the present disclosure illustrating a mechanism which changes the positions of the first lens group in the optical axis directions, and a mechanism which changes the angles of the mirror with respect to the optical axis direction;
  • FIG. 1C is a front view showing an example of an imaging device
  • FIG. 1D is a rear view of FIG. 1C;
  • FIG. 2 is a diagram of a camera module according to a modification example of the present disclosure
  • FIG. 3 is a configuration diagram of an optical system on a first focal length side of a camera module according to a first example of the present disclosure
  • FIG. 4 is a configuration diagram of an optical system on a second focal length side of a camera module according to the first example of the present disclosure
  • FIG. 5 is an aberration diagram of the optical system on the first focal length side of the camera module according to the first example of the present disclosure
  • FIG. 6 is an aberration diagram of the optical system on the second focal length side of the camera module according to the first example of the present disclosure
  • FIG. 7 is a configuration diagram of an optical system on a first focal length side of a camera module according to a second example of the present disclosure
  • FIG. 8 is a configuration diagram of an optical system on a second focal length side of a camera module according to the second example of the present disclosure
  • FIG. 9 is an aberration diagram of the optical system on the first focal length side of the camera module according to the second example of the present disclosure.
  • FIG. 10 is an aberration diagram of the optical system on the second focal length side of the camera module according to the second example of the present disclosure.
  • FIG. 11 is a configuration diagram of an optical system on a first focal length side of a camera module according to a third example of the present disclosure.
  • FIG. 12 is a configuration diagram of an optical system on a second focal length side of a camera module according to the third example of the present disclosure.
  • FIG. 13 is an aberration diagram of the optical system on the first focal length side of the camera module according to the third example of the present disclosure.
  • FIG. 14 is an aberration diagram of the optical system on the second focal length side of the camera module according to the third example of the present disclosure.
  • FIG. 15 is a configuration diagram of an optical system on a first focal length side of a camera module according to a fourth example of the present disclosure.
  • FIG. 16 is a configuration diagram of an optical system on a second focal length side of a camera module according to the fourth example of the present disclosure.
  • FIG. 17 is an aberration diagram of the optical system on the first focal length side of the camera module according to the fourth example of the present disclosure.
  • FIG. 18 is an aberration diagram of the optical system on the second focal length side of the camera module according to the fourth example of the present disclosure.
  • FIG. 19 is a configuration diagram of an optical system on a first focal length side of a camera module according to a fifth example of the present disclosure.
  • FIG. 20 is a configuration diagram of an optical system on a second focal length side of a camera module according to the fifth example of the present disclosure.
  • FIG. 21 is an aberration diagram of the optical system on the first focal length side of the camera module according to the fifth example of the present disclosure.
  • FIG. 22 is an aberration diagram of the optical system on the second focal length side of the camera module according to the fifth example of the present disclosure.
  • a camera module 11 to which the present disclosure applies is a collapsible camera module with a compact configuration in which a plurality of optical systems partially share their elements.
  • an imaging lens 21 of the camera module 11 includes a first lens group 311 for shooting at a first focal length, a second lens group 312 for shooting at a second focal length, a third lens group 32 for shooting at the first focal length and the second focal length, and a prism 35 positioned immovably on an object side of the second lens group 312.
  • the camera module 11 is configured to change a position of the first lens group 311, in an optical axis direction, between a first shooting state where a subject (object) is shot at the first focal length (recorded as an image) and a lens storage state where the imaging lens assembly 21 is stored in a housing of the camera module 11.
  • the camera module 11 is also configured to change, whether or not an optical path which optically connects the first lens group 311 and the third lens group 32 is formed, between the first shooting state and the lens storage state.
  • the camera module 11 is configured to change the position of the first lens group 311, in the optical axis direction, between a second shooting state where the subject is shot at the second focal length and the lens storage state.
  • the camera module 11 is also configured to change, whether or not an optical path which optically connects the prism 35, the second lens group 312 and the third lens group 32 is formed, between the second shooting state and the lens storage state. Whether or not an optical path which optically connects the first lens group 311 and the third lens group 32 is formed depends on an angle of a mirror 33. Whether or not an optical path which optically connects the prism 35, the second lens group 312, and the third lens group 32 is formed also depends on the angle of the mirror 33.
  • the mirror 33 is disposed on an imaging side of the first lens group 311 and the second lens group 312on the object side of the third lens group 32.
  • the optical axis direction of the first lens group 311 is perpendicular to optical axis directions of the second lens group 312 and the third lens group 32.
  • the optical axis direction of the second lens group 312 is parallel to the optical axis direction of the third lens group 32.
  • the second lens group 312 and the third lens group 32 are disposed on opposite sides with respect to the mirror 33.
  • the mirror 33 is rotatable about one end 33a on the third lens group 32 side of the mirror 33.
  • dash–dot lines represent the optical axes of the camera modules 11 (hereinafter the same applies) .
  • the camera module 11 includes a first optical axis OA1, which is an optical axis of an optical system on the first focal length side, and a second optical axis OA2 which is an optical axis of an optical system on the second focal length side.
  • the first optical axis OA1 includes an optical axis OA311 of the first lens group 311 and an optical axis OA32 of the third lens group 32.
  • the optical axis OA311 of the first lens group 311 and the optical axis OA32 of the third lens group 32 are continuous with each other at an intersection 33b with the mirror 33.
  • the second optical axis OA2 includes an optical axis OA312 of the second lens group 312 and the optical axis OA32 of the third lens group 32.
  • the optical axis OA312 of the second lens group 312 and the optical axis OA32 of the third lens group 32 are linearly continuous with each other.
  • the first lens group 311 is configured to change its position in an optical axis direction between the first and second shooting states and the lens storage state.
  • the mirror 33 is configured to tilt with respect to both of an optical axis direction of the first lens group 311 and an optical axis direction of the third lens group 32 in the first shooting state. As a result, the mirror 33 is configured to form an optical path optically connecting the first lens group 311 and the third lens group 32 in the first shooting state. The mirror 33 is configured to maintain a state of being substantially perpendicular to the optical axis direction of the first lens group 311 in the second shooting state. As a result, the mirror 33 is configured not to obstruct an optical path optically connecting the prism 35 positioned on an object side of the second lens group 312, the second lens group 312 and the third lens group 32 in the second shooting state.
  • the mirror 33 is also configured to be substantially perpendicular to the optical axis direction of the first lens group 311 in the lens storage state. As a result, the mirror 33 is configured to secure a storage space for the first lens group 311 in the lens storage state.
  • the first lens group 311 is stored in the housing 4 in the lens storage state. Further, the mirror 33 is perpendicular to the optical axis direction of the first lens group 311 in order to secure a storage space of the first lens group 311.
  • the first lens group 311, the second lens group 312 and the third lens group 32 are held in barrels 261, 262, 263.
  • the camera module 11 switches from the lens storage state to the first shooting state when a predetermined user operation, which switches from the lens storage state to the first shooting state, is performed.
  • the camera module 11 pushes out the first lens group 311 stored in the housing 4 in a direction protruding from the housing 4, the direction being opposite to the mirror 33, by using a lens drive mechanism 24 during the switching from the lens storage state to the first shooting state.
  • the drive mechanism 24 may be an actuator such as a voice coil motor.
  • the camera module 11 drives the mirror 33 so as to form the optical path optically connecting the first lens group 311 and the third lens group 32 by using a mirror drive mechanism 25 during the switching from the lens storage state to the first shooting state.
  • the mirror driving mechanism 25 rotates the mirror 33 about one end 33a toward the third lens group 32 side and tilts the mirror 33 with respect to both the optical axis direction of the first lens group 311 and the optical axis direction of the third lens group 32.
  • an optical path optically connecting the first lens group 311 and the third lens group 32 is formed as an optical path on the first focal length side.
  • the optical path optically connecting the prism 35, the second lens group 312 and the third lens group 32 is not formed.
  • a tilt angle ⁇ of the mirror 33 in the first shooting state is 45°.
  • the reference of the tilt angle ⁇ of 0° is the optical axis direction of the third lens group 32.
  • the tilt angle ⁇ is in a range of 42° or more and 48° or less.
  • the mirror driving mechanism 25 may be an actuator such as a motor.
  • the camera module 11 switches from the lens storage state to the second shooting state when a predetermined user operation, which switches from the lens storage state to the second shooting state, is performed. As shown in FIG. 1B, the camera module 11 pushes out the first lens group 311 stored in the housing 4, in a direction protruding from the housing 4, by using a lens drive mechanism 24 during the switching from the lens storage state to the second shooting state.
  • the camera module 11 does not drive the mirror 33 by using a mirror drive mechanism 25 during the switching from the lens storage state to the second shooting state. More specifically, the mirror driving mechanism 25, without rotating the mirror 33 toward the third lens group 32 side, maintains the mirror 33 in a state of being perpendicular to the optical axis direction of the first lens group 311. As a result, an optical path optically connecting the prism 35, the second lens group 312 and the third lens group 32, which is an optical path on the second focal length side, is not obstructed by the mirror 33. At this time, the optical path optically connecting the first lens group 311 and the third lens group 32 is not formed.
  • the camera module 11 switches from the first shooting state to the lens storage state when a predetermined user operation, which switches from the first shooting state to the lens storage state, is performed.
  • the lens drive mechanism 24 retracts and stores the front lens group 311 in the housing 4 during the switching from the first shooting state to the lens storage state.
  • the mirror drive mechanism 25 drives the mirror 33 so as to not form the optical path optically connecting the first lens group 311 and the third lens group 32. More specifically, the mirror drive mechanism 25 rotates the mirror 33 about one end 33a toward an opposite side of the third lens group 32 to make the mirror 33 perpendicular to the optical axis direction of the first lens group 311 during switching from the first shooting state to the lens storage state.
  • the mirror 33 being perpendicular to the optical axis direction of the first lens group 311 makes it possible to secure a storage space for the first lens group 311.
  • the camera module 11 switches from the second shooting state to the lens storage state when a predetermined user operation, which switches from the second shooting state to the lens storage state, is performed.
  • the lens drive mechanism 24 retracts and stores the front lens group 311 in the housing 4 during the switching from the second shooting state to the lens storage state.
  • the camera module 11 does not drive the mirror 33 by using a mirror drive mechanism 25 during the switching from the lens storage state to the second shooting state.
  • the mirror 33 maintaining a state of being perpendicular to the optical axis direction of the first lens group 311 makes it possible to secure a storage space for the first lens group 311.
  • the camera module 11 may switch between the first shooting state and the second shooting state according to a user operation.
  • the camera module 11 to which the present disclosure applies is configured as shown in FIG. 3, 4, 7, 8, 11, 12, 15, 16, 19 and 20, for example.
  • the camera module 11 includes an imaging lens assembly 21, an optical filter 22 and an image sensor 23.
  • the imaging lens assembly 21 is configured to change the position of the first lens group 311 in the optical axis direction.
  • the imaging lens assembly 21 is further configured to change whether or not the optical path connecting the first lens group 311 and the third lens group 32 is formed, between the first shooting states and the lens storage state.
  • the imaging lens assembly 21 is further configured to change whether or not the optical path connecting the prism 35, the second lens group 312 and the third lens group 32 is formed, between the second shooting states and the lens storage state.
  • the imaging lens assembly 21 is also designed to maintain its good optical performance despite its small size.
  • 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 on the imaging lens assembly 21.
  • the image sensor 23 receives incident light from the subject (object side) via the imaging lens assembly 21 and the optical filter 22, photoelectrically converts the light, and outputs an image data, obtained by photoelectric conversion of the light, to a subsequent stage.
  • the optical filter 22 disposed between the imaging lens assembly 21 and the image sensor 23 may be, for example, an IR (infrared) filter which cuts infrared light from incident light.
  • the imaging lens assembly 21 includes an optical system on the first focal length side and an optical system on the second focal length side.
  • the optical system on the first focal length side includes the first lens group 311 including at least one lens having a positive refractive power, the third lens group 32 including at least one lens having a negative refractive power, and the mirror 33 positioned on the imaging side of the first lens group 311 on the object side of the third lens group 32.
  • the optical system on the second focal length side includes the second lens group 312 including at least one lens having a positive refractive power, the third lens group 32 shared with the optical system on the first focal length side, and the prism 35 positioned on an object side of the second lens group 312.
  • the front lens group 311 is configured to change its positions in the optical axis directions between the first and second shooting state and the lens storage state, for example, by using the lens driving mechanism 24 mentioned above.
  • the mirror 33 is configured to form the optical paths optically connecting the front lens group 311 and the third lens group 32 in the first shooting state, not to obstruct the optical path optically connecting the prism 35, the second lens group 312 and the third lens group 32 in the second shooting state, and to secure the storage space for the first lens group 311 in the lens storage state, for example, by using the mirror drive mechanism 25 mentioned above.
  • Aperture stops 34 are disposed between most object side disposed lenses of the first lens groups 311 and the mirror 33 and between most object side disposed lenses of the second lens groups 312 and the mirror 33.
  • the first focal length may be a short focal length
  • the second focal length may be a long focal length
  • the first shooting state may be a wide–angle shooting state
  • the second shooting state may be a telephoto shooting state.
  • the third lens group 32 shared between the optical system of the short focal length side and the optical system of the long focal length side, it is possible to reduce the thickness of the housing 4 and the number of parts while ensuring the flexibility of the focal length.
  • first focal length in the imaging lens assembly 21 may be equal to the second focal length in the imaging lens assembly 21.
  • An incident direction of the incident light into the first lens group 311 may be opposite to an incident direction of the incident light into the prism. That is, the first shooting state according to the optical system on the first focal length side may be a shooting state with a rear camera 101 which shoots an object on an opposite side to a display 102 of the imaging device 100, and the second shooting state according to the optical system on the second focal length side may be a shooting state with a front camera 103 which shoots an object on a display 102 side of the imaging device 100 as shown in FIG. 1C and 1D.
  • the rear camera 101 includes the optical system on the first focal length side which includes the first lens group 311, the mirror 33, and the third lens group 32.
  • the front camera 103 includes the optical system on the second focal length side which includes the prism 35, the second lens group 312, and the third lens group 32.
  • An incident direction of the incident light into the first lens group 311 may be equal to an incident direction of the incident light into the prism 35.
  • Such a configuration corresponds to the configuration of FIG. 1A in which the prism 35 is inversely disposed as shown in FIG. 2.
  • the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (1) :
  • LG2 is a focal length of the second lens group 312 (hereinafter the same applies) .
  • LG1 is a focal length of the first lens group 311 (hereinafter the same applies) .
  • LG2 /LG1 deviates from the range of formula (1) , it is difficult to secure a balance of the optical performance between the optical system on the first focal length side and the optical system on the second focal length side, and thus it is difficult to maintain the optical performance of the imaging lens assembly 21.
  • the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (2) :
  • ⁇ d1 is a distance on the first optical axis OA1 of the imaging lens assembly 21 from a vertex of an object side surface of a most object side disposed lens of the first lens group 311 to the imaging surface S (hereinafter the same applies) . That is, ⁇ d1 is a full length of the imaging lens assembly 21 on the first focal length side.
  • the first optical axis OA1 includes the optical axis OA311 of the first lens group 311 and the optical axis OA32 of the third lens group 32 which are continuous with each other at the intersection 33b with the mirror 33.
  • ⁇ d2 is a distance on the second optical axis OA2 of the imaging lens assembly 21 from a reflection surface 35a of the prism 35 to the imaging surface S (hereinafter the same applies) . That is, ⁇ d2 is a full length of the imaging lens assembly 21 on the second focal length side.
  • the second optical axis OA2 includes the optical axis OA312 of the second lens group 312 and the optical axis OA32 of the third lens group 32 which are linearly continuous with each other.
  • Yh_1 is an image height, which is a half-diagonal length of the imaging surface S, of the first focal length side (hereinafter the same applies) .
  • Yh_2 is an image height, which is a half-diagonal length of the imaging surface S, of the second focal length side (hereinafter the same applies) .
  • the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (3) :
  • f1 is a focal length of the imaging lens assembly 21 on the first focal length side (hereinafter the same applies) . That is, f1 is a focal length of the optical system on the first focal length side.
  • the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (4) :
  • f2 is a focal length of the imaging lens assembly 21 on the second focal length side (hereinafter the same applies) . That is, f2 is a focal length of the optical system on the second focal length side.
  • the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (5) :
  • LG1 /f1 exceeds the upper limit value of the formula (5) , it is difficult to secure a balance of the optical performance between the optical system on the first focal length side and the optical system on the second focal length side, and thus it is difficult to maintain the optical performance of the imaging lens assembly 21.
  • the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (6) :
  • LG3 is a focal length of the third lens group 32 (hereinafter the same applies) .
  • LG1 /LG3 exceeds the upper limit value of the formula (6) , it is difficult to secure a balance of the optical performance between the optical system on the first focal length side and the optical system on the second focal length side, and thus it is difficult to maintain the optical performance of the imaging lens assembly 21.
  • the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (7) :
  • LG2 /LG3 exceeds the upper limit value of the formula (7) , it is difficult to secure a balance of the optical performance between the optical system on the first focal length side and the optical system on the second focal length side, and thus it is difficult to maintain the optical performance of the imaging lens assembly 21.
  • an aspheric lens in the imaging lens assembly 21 is formed of a plastic material.
  • lenses having a size equal to or smaller than a specific size are preferably formed of a plastic material, and lenses larger than the specific size are preferably formed of a glass material. This is because it is difficult to form an aspheric lens or a relatively small lens using a material other than a plastic material.
  • Such a camera module 11 including the imaging lens assembly 21 can be used in compact digital devices (imaging devices) such as mobile phones, wearable cameras and surveillance cameras.
  • 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 indicated by 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.
  • “Pr surface” indicates the reflection surface of the prism.
  • Pe surface indicates the emitting surface of the prism.
  • R indicates the value of a central curvature radius (mm) of the 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 also applies 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.
  • the imaging lens assembly 21 used in the following examples includes lenses having aspheric surfaces.
  • the aspheric shape of the lens is defined by the following formula (8) :
  • 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 a conic constant (second-order aspheric coefficient)
  • An is an nth-order aspheric coefficient.
  • the optical system on the first focal length side of the imaging lens assembly 21 includes, in order from the object side toward the imaging surface S side, a first lens L11 belonging to the first lens group 311 and having a positive refractive power with a convex surface facing the object side, a second lens L12 belonging to the first lens group 311 and having a negative refractive power, a mirror 33, a third lens L3 belonging to the third lens group 32 and having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, and a fourth lens L4 belonging to the third lens group 32 and having a negative refractive power with concave surfaces facing the object side and the imaging surface S side.
  • the aperture stop 34 is disposed between the second lens L12 and the mirror 33.
  • Table 1 shows lens data from the first focal length side of the first example.
  • the unit of length or distance shown in each of the following tables is mm.
  • Table 2 shows a focal length of each lens, a focal length LG1 of the first lens group 311, and a focal length LG3 of the third lens group 32.
  • Table 3 shows the focal length f1 of the imaging lens assembly 21 on the first focal length side, the F number Fno, the angle of view 2 ⁇ , the full length ⁇ d1 of the imaging lens assembly 21 on the first focal length side which is obtained when an object point is taken at infinity, the distance ⁇ Ld1 on the optical axis OA311 of the first lens group 311 from a vertex of an object side surface of a most object side disposed lens of the first lens group 311 to the mirror 33, the distance ⁇ Ld2 on the optical axis OA32 of the third lens group 32 from the mirror 33 to the imaging surface S, and the image height Yh_1 of the first focal length side.
  • Table 4 shows the aspheric coefficients on the first focal length side of the imaging lens assembly 21.
  • the optical system on the second focal length side of the imaging lens assembly 21 includes, in order from the object side toward the imaging surface S side, the prism 35 having a reflection surface 35a which reflects the incident light from the object side to the second lens group 312, a first lens L21 belonging to the second lens group 312 and having a positive refractive power with a convex surface facing the object side, a second lens L22 belonging to the second lens group 312 and having a negative refractive power, a third lens L3 belonging to the third lens group 32 and having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, and a fourth lens L4 belonging to the third lens group 32 and having a negative refractive power with concave surfaces facing the object side and the imaging surface S side.
  • the third lens L3 and the fourth lens L4 are the same as those of the optical system on the first focal length side.
  • the aperture stop 34 is disposed between the second lens L22 and the third lens L3.
  • Table 5 shows lens data from the second focal length side of the first example.
  • Table 6 shows a focal length of each lens, a focal length LG2 of the second lens group 312, and a focal length LG3 of the third lens group 32.
  • Table 7 shows the focal length f2 of the imaging lens assembly 21 on the second focal length side, the F number Fno, the angle of view 2 ⁇ , the full length ⁇ d2 of the imaging lens assembly 21 on the second focal length side which is obtained when an object point is taken at infinity, and the image height Yh_2 of the second focal length side.
  • Table 8 shows the aspheric coefficients on the second focal length side of the imaging lens assembly 21.
  • Table 9 shows values corresponding to the conditional expressions.
  • FIG. 5 shows, as examples of aberrations, spherical aberration, astigmatism (field curvature) and distortion.
  • Each of these aberration diagrams shows aberrations with d-line (587.56 nm) as a reference wavelength.
  • spherical aberration diagram Aberrations with respect to g-line (435.84 nm) and C-line (656.27 nm) are also shown.
  • S indicates a value of aberration on a sagittal image surface
  • T indicates a value of aberration on a tangential image surface.
  • IMG HT indicates an image height. The same applies to aberration diagrams in other examples.
  • the camera module 11 in the first example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size.
  • the optical system on the first focal length side of the imaging lens assembly 21 according to the second example is shown in FIG. 7.
  • Lens parameters corresponding to those in the first example are shown in Tables 10-13.
  • the optical system on the second focal length side of the imaging lens assembly 21 according to the second example is shown in FIG. 8.
  • Lens parameters corresponding to those in the first example are shown in Tables 14-17.
  • Table 18 shows values corresponding to the conditional expressions.
  • LG2/LG1 ⁇ 2 1.40 5 ⁇ ( ⁇ d1+ ⁇ d2) / (Yh_1+Yh_2) ⁇ 25 21.95 ⁇ d1/f1 ⁇ 2.0 1.32 ⁇ d2/f2 ⁇ 2.0 1.51 LG1/f1 ⁇ 2.0 1.37 LG1/LG3 ⁇ 0 -0.05 LG2/LG3 ⁇ 0 -0.07
  • FIG. 9 Aberrations on the first focal length side in the second example are shown in FIG. 9.
  • FIG. 10 Aberrations on the second focal length side in the second example are shown in FIG. 10.
  • the degree of freedom in designing the camera module 11 according to the present disclosure can be increased while obtaining the same effects as in the first example.
  • the optical system on the first focal length side of the imaging lens assembly 21 according to the third example is shown in FIG. 11.
  • Lens parameters corresponding to those in the first example are shown in Tables 19 -22.
  • the optical system on the second focal length side of the imaging lens assembly 21 according to the third example is shown in FIG. 12.
  • Lens parameters corresponding to those in the first example are shown in Tables 23 -26.
  • Table 27 shows values corresponding to the conditional expressions.
  • FIG. 13 Aberrations on the first focal length side in the third example are shown in FIG. 13.
  • FIG. 14 Aberrations on the second focal length side in the third example are shown in FIG. 14.
  • the degree of freedom in designing the camera module 11 according to the present disclosure can be further increased while obtaining the same effects as in the first example.
  • the optical system on the first focal length side of the imaging lens assembly 21 according to the fourth example is shown in FIG. 15.
  • Lens parameters corresponding to those in the first example are shown in Tables 28 -31.
  • the optical system on the second focal length side of the imaging lens assembly 21 according to the fourth example is shown in FIG. 16.
  • Lens parameters corresponding to those in the first example are shown in Tables 32 -35.
  • Table 36 shows values corresponding to the conditional expressions.
  • LG2/LG1 ⁇ 2 1.00 5 ⁇ ( ⁇ d1+ ⁇ d2) / (Yh_1+Yh_2) ⁇ 25 18.76 ⁇ d1/f1 ⁇ 2.0 1.32 ⁇ d2/f2 ⁇ 2.0 1.62 LG1/f1 ⁇ 2.0 1.37 LG1/LG3 ⁇ 0 -0.05 LG2/LG3 ⁇ 0 -0.05
  • FIG. 17 Aberrations on the first focal length side in the fourth example are shown in FIG. 17.
  • FIG. 18 Aberrations on the second focal length side in the fourth example are shown in FIG. 18.
  • the degree of freedom in designing the camera module 11 according to the present disclosure can be further increased while obtaining the same effects as in the first example.
  • the optical system on the first focal length side of the imaging lens assembly 21 according to the fifth example is shown in FIG. 19.
  • Lens parameters corresponding to those in the first example are shown in Tables 37 -40.
  • the optical system on the second focal length side of the imaging lens assembly 21 according to the fifth example is shown in FIG. 20.
  • Lens parameters corresponding to those in the first example are shown in Tables 41 -44.
  • Table 45 shows values corresponding to the conditional expressions.
  • LG2/LG1 ⁇ 2 1.00 5 ⁇ ( ⁇ d1+ ⁇ d2) / (Yh_1+Yh_2) ⁇ 25 8.88 ⁇ d1/f1 ⁇ 2.0 1.52 ⁇ d2/f2 ⁇ 2.0 1.52 LG1/f1 ⁇ 2.0 1.24 LG1/LG3 ⁇ 0 -0.29 LG2/LG3 ⁇ 0 -0.29
  • FIG. 21 Aberrations on the first focal length side in the fifth example are shown in FIG. 21.
  • FIG. 22 Aberrations on the second focal length side in the fifth example are shown in FIG. 22.
  • the degree of freedom in designing the camera module 11 according to the present disclosure can be further increased while obtaining the same effects as in the first example.
  • 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 according 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.

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Abstract

An imaging lens assembly (21) includes a first lens group (311) for shooting at a first focal length, a second lens group (312) for shooting at a second focal length, a third lens group (32) for shooting at the first and second focal lengths, a mirror (33) positioned on an imaging side of the first and second lens groups (311,312) on an object side of the third lens group (32), and a prism (35) positioned on the object side of the second lens group (312). The first lens group (311) changes its position in an optical axis direction between a first and a second shooting state and a lens storage state. The mirror (33) is configured to form an optical path optically connecting the first and the third lens group (311,312), not to obstruct an optical path optically connecting the prism (35), the second lens group (312) and the third lens group (32), or to secure a storage space for the first lens group (311).

Description

IMAGING LENS ASSEMBLY, CAMERA MODULE AND IMAGING DEVICE TECHNICAL FIELD
The present disclosure relates to an imaging lens assembly, a camera module, and an imaging device, and more specifically, to an imaging lens assembly, a camera module, and an imaging device which are small and enable good optical performance.
BACKGROUND
In recent years, portable imaging devices such as mobile phones and digital cameras are being widely used. With the recent miniaturization of imaging devices, the imaging lens assembly mounted on such imaging devices also requires downsizing. In order to meet such a demand for miniaturization, a conventional imaging lens assembly secures a focal length of the imaging lens assembly within a restricted space by employing a prism positioned on an object side of a lens group.
However, in the case of conventional imaging lenses, it has been difficult to compactly mount a plurality of optical systems having a prism and a collapsible optical system.
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 assembly, a camera module, and an imaging device.
In accordance with the present disclosure, an imaging lens assembly includes:
a first lens group for shooting at a first focal length;
a second lens group for shooting at a second focal length;
a third lens group for shooting at the first focal length and the second focal length;
a mirror positioned on an imaging side of the first lens group and the second lens group on an object side of the third lens group; and
a prism positioned on an object side of the second lens group, wherein
the first lens group is configured to change its position in an optical axis direction between a first shooting state, where shooting at the first focal length is performed, and a lens storage state, and between a second shooting state, where shooting at the second focal length is performed, and the lens storage state, and
the mirror is configured to form an optical path optically connecting the first lens group and the third lens group in the first shooting state, not to obstruct an optical path optically connecting the prism, the second lens group and the third lens group in the second shooting state, and to secure a storage space for the first lens group in the lens storage state.
In accordance with the present disclosure, a camera module includes:
the imaging lens assembly; and
an image sensor including an imaging surface.
In accordance with the present disclosure, an imaging device includes:
the camera module; and
a housing for storing the imaging lens assembly.
BRIEF DESCRIPTION OF THE DRAWINGS
These and/or other aspects and advantages of the 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. 1A is a diagram of a camera module according to the present disclosure illustrating a first lens group which changes its position in the optical axis direction between a first shooting state or a second shooting state and a lens storage state, and a mirror which changes its angle with respect to the optical axis directions between the first shooting state and the lens storage state;
FIG. 1B is a diagram of a camera module according to the present disclosure illustrating a mechanism which changes the positions of the first lens group in the optical axis directions, and a mechanism which changes the angles of the mirror with respect to the optical axis direction;
FIG. 1C is a front view showing an example of an imaging device;
FIG. 1D is a rear view of FIG. 1C;
FIG. 2 is a diagram of a camera module according to a modification example of the present disclosure;
FIG. 3 is a configuration diagram of an optical system on a first focal length side of a camera module according to a first example of the present disclosure;
FIG. 4 is a configuration diagram of an optical system on a second focal length side of a camera module according to the first example of the present disclosure;
FIG. 5 is an aberration diagram of the optical system on the first focal length side of the camera module according to the first example of the present disclosure;
FIG. 6 is an aberration diagram of the optical system on the second focal length side of the camera module according to the first example of the present disclosure;
FIG. 7 is a configuration diagram of an optical system on a first focal length side of a camera module according to a second example of the present disclosure;
FIG. 8 is a configuration diagram of an optical system on a second focal length side of a camera module according to the second example of the present disclosure;
FIG. 9 is an aberration diagram of the optical system on the first focal length side of the camera module according to the second example of the present disclosure;
FIG. 10 is an aberration diagram of the optical system on the second focal length side of the camera module according to the second example of the present disclosure;
FIG. 11 is a configuration diagram of an optical system on a first focal length side of a camera module according to a third example of the present disclosure;
FIG. 12 is a configuration diagram of an optical system on a second focal length side of a camera module according to the third example of the present disclosure;
FIG. 13 is an aberration diagram of the optical system on the first focal length side of the camera module according to the third example of the present disclosure;
FIG. 14 is an aberration diagram of the optical system on the second focal length side of the camera module according to the third example of the present disclosure;
FIG. 15 is a configuration diagram of an optical system on a first focal length side of a camera module according to a fourth example of the present disclosure;
FIG. 16 is a configuration diagram of an optical system on a second focal length side of a camera module according to the fourth example of the present disclosure;
FIG. 17 is an aberration diagram of the optical system on the first focal length side of the camera module according to the fourth example of the present disclosure;
FIG. 18 is an aberration diagram of the optical system on the second focal length side of the camera module according to the fourth example of the present disclosure;
FIG. 19 is a configuration diagram of an optical system on a first focal length side of a camera module according to a fifth example of the present disclosure;
FIG. 20 is a configuration diagram of an optical system on a second focal length side of a camera module according to the fifth example of the present disclosure;
FIG. 21 is an aberration diagram of the optical system on the first focal length side of the camera module according to the fifth example of the present disclosure, and
FIG. 22 is an aberration diagram of the optical system on the second focal length side 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 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 they shall not be construed to limit the present disclosure.
<Outline of the disclosure>
First, an outline of the present disclosure will be described. As shown in FIG. 1A, a camera module 11 to which the present disclosure applies, is a collapsible camera module with a compact configuration in which a plurality of optical systems partially share their elements. Specifically, as shown in FIG. 1A, an imaging lens 21 of the camera module 11 includes a first lens group 311 for shooting at a first focal length, a second lens group 312 for shooting at a second focal length, a third lens group 32 for shooting at the first focal length and the second focal length, and a prism 35 positioned immovably on an object side of the second lens group 312.
The camera module 11 is configured to change a position of the first lens group 311, in an optical axis direction, between a first shooting state where a subject (object) is shot at the first focal length (recorded as an image) and a lens storage state where the imaging lens assembly 21 is stored in a housing of the camera module 11. The camera module 11 is also configured to change, whether or not an optical path which optically connects the first lens group 311 and the third lens group 32 is formed, between the first shooting state and the lens storage state. Further, the camera module 11 is configured to change the position of the first lens group 311, in the optical axis direction, between a second shooting state where the subject is shot at the second focal length and the lens storage state. The camera module 11 is also configured to change, whether or not an optical path which optically connects the prism 35, the second lens group 312 and the third lens group  32 is formed, between the second shooting state and the lens storage state. Whether or not an optical path which optically connects the first lens group 311 and the third lens group 32 is formed depends on an angle of a mirror 33. Whether or not an optical path which optically connects the prism 35, the second lens group 312, and the third lens group 32 is formed also depends on the angle of the mirror 33. The mirror 33 is disposed on an imaging side of the first lens group 311 and the second lens group 312on the object side of the third lens group 32. The optical axis direction of the first lens group 311 is perpendicular to optical axis directions of the second lens group 312 and the third lens group 32. The optical axis direction of the second lens group 312 is parallel to the optical axis direction of the third lens group 32. The second lens group 312 and the third lens group 32 are disposed on opposite sides with respect to the mirror 33. The mirror 33 is rotatable about one end 33a on the third lens group 32 side of the mirror 33. In the FIG. 1A, dash–dot lines represent the optical axes of the camera modules 11 (hereinafter the same applies) .
As shown in FIG. 1A, the camera module 11 includes a first optical axis OA1, which is an optical axis of an optical system on the first focal length side, and a second optical axis OA2 which is an optical axis of an optical system on the second focal length side.
The first optical axis OA1 includes an optical axis OA311 of the first lens group 311 and an optical axis OA32 of the third lens group 32. The optical axis OA311 of the first lens group 311 and the optical axis OA32 of the third lens group 32 are continuous with each other at an intersection 33b with the mirror 33.
The second optical axis OA2 includes an optical axis OA312 of the second lens group 312 and the optical axis OA32 of the third lens group 32. The optical axis OA312 of the second lens group 312 and the optical axis OA32 of the third lens group 32 are linearly continuous with each other.
The first lens group 311 is configured to change its position in an optical axis direction between the first and second shooting states and the lens storage state.
The mirror 33 is configured to tilt with respect to both of an optical axis direction of the first lens group 311 and an optical axis direction of the third lens group 32 in the first shooting state. As a result, the mirror 33 is configured to form an optical path optically connecting the first lens group 311 and the third lens group 32 in the first shooting state. The mirror 33 is configured to maintain a state of being substantially perpendicular to the optical axis direction of the first lens group 311 in the second shooting state. As a result, the mirror 33 is configured not to obstruct an optical path optically connecting the prism 35 positioned on an object side of the second lens group 312, the second lens group 312 and the third lens group 32 in the second shooting state.
The mirror 33 is also configured to be substantially perpendicular to the optical axis direction of the first lens group 311 in the lens storage state. As a result, the mirror 33 is configured to secure a storage space for the first lens group 311 in the lens storage state.
More specifically, as shown in FIG. 1B, the first lens group 311 is stored in the housing 4 in the lens storage state. Further, the mirror 33 is perpendicular to the optical axis direction of the first lens group 311 in order to secure a storage space of the first lens group 311. The first lens group 311, the second lens group 312 and the third lens group 32 are held in  barrels  261, 262, 263.
Then, the camera module 11 switches from the lens storage state to the first shooting state when a predetermined user operation, which switches from the lens storage state to the first shooting state, is performed. As shown in FIG. 1B, the camera module 11 pushes out the first lens group 311 stored in the housing 4 in a direction protruding from the housing 4, the direction being opposite to the mirror 33, by using a lens drive mechanism 24 during the switching from the lens storage state to the first shooting state. The drive mechanism 24 may be an actuator such as a voice coil motor.
Further, the camera module 11 drives the mirror 33 so as to form the optical path optically connecting the first lens group 311 and the third lens group 32 by using a mirror drive mechanism 25 during the switching from the lens storage state to the first shooting state.
More specifically, the mirror driving mechanism 25 rotates the mirror 33 about one end 33a toward the third lens group 32 side and tilts the mirror 33 with respect to both the optical axis direction of the first lens group 311 and the optical axis direction of the third lens group 32. As a result, an optical path optically connecting the first lens group 311 and the third lens group 32 is formed as an optical path on the first focal length side. At this time, the optical path optically connecting the prism 35, the second lens group 312 and the third lens group 32 is not formed.
In the example shown in FIG. 1A, a tilt angle θ of the mirror 33 in the first shooting state is 45°. In FIG. 1A, the reference of the tilt angle θ of 0° is the optical axis direction of the third lens group 32. In view of suppressing the thickness of the camera module 11 and of facilitating the alignment of the first lens group 311 and the third lens group 32, it is preferable that the tilt angle θ is in a range of 42° or more and 48° or less.
The mirror driving mechanism 25 may be an actuator such as a motor.
The camera module 11 switches from the lens storage state to the second shooting state when a predetermined user operation, which switches from the lens storage state to the second shooting state, is performed. As shown in FIG. 1B, the camera module 11 pushes out the first lens group 311 stored in the  housing 4, in a direction protruding from the housing 4, by using a lens drive mechanism 24 during the switching from the lens storage state to the second shooting state.
Further, the camera module 11 does not drive the mirror 33 by using a mirror drive mechanism 25 during the switching from the lens storage state to the second shooting state. More specifically, the mirror driving mechanism 25, without rotating the mirror 33 toward the third lens group 32 side, maintains the mirror 33 in a state of being perpendicular to the optical axis direction of the first lens group 311. As a result, an optical path optically connecting the prism 35, the second lens group 312 and the third lens group 32, which is an optical path on the second focal length side, is not obstructed by the mirror 33. At this time, the optical path optically connecting the first lens group 311 and the third lens group 32 is not formed.
On the other hand, the camera module 11 switches from the first shooting state to the lens storage state when a predetermined user operation, which switches from the first shooting state to the lens storage state, is performed. The lens drive mechanism 24 retracts and stores the front lens group 311 in the housing 4 during the switching from the first shooting state to the lens storage state. At this time, the mirror drive mechanism 25 drives the mirror 33 so as to not form the optical path optically connecting the first lens group 311 and the third lens group 32. More specifically, the mirror drive mechanism 25 rotates the mirror 33 about one end 33a toward an opposite side of the third lens group 32 to make the mirror 33 perpendicular to the optical axis direction of the first lens group 311 during switching from the first shooting state to the lens storage state. The mirror 33 being perpendicular to the optical axis direction of the first lens group 311 makes it possible to secure a storage space for the first lens group 311.
The camera module 11 switches from the second shooting state to the lens storage state when a predetermined user operation, which switches from the second shooting state to the lens storage state, is performed. The lens drive mechanism 24 retracts and stores the front lens group 311 in the housing 4 during the switching from the second shooting state to the lens storage state. The camera module 11 does not drive the mirror 33 by using a mirror drive mechanism 25 during the switching from the lens storage state to the second shooting state. The mirror 33 maintaining a state of being perpendicular to the optical axis direction of the first lens group 311 makes it possible to secure a storage space for the first lens group 311.
The camera module 11 may switch between the first shooting state and the second shooting state according to a user operation.
Such a collapsible camera module 11, in which the first lens group 311 protrudes from the housing 4 during the first and second shooting states, has excellent storability and portability when shooting is not performed. Further, by having the third lens group 32 shared between the optical system on the first focal length side and the optical system on the second focal length side, it is possible to reduce the thickness of the housing 4 and the number of parts. Further, by disposing the mirror 33, which is rotatable about the one end 33a, between the  front lens groups  311, 312 and the third lens group 32, the front lens group 31 can be allowed to collapse while the prism 35 is disposed in a restricted installation space.
The camera module 11 to which the present disclosure applies is configured as shown in FIG. 3, 4, 7, 8, 11, 12, 15, 16, 19 and 20, for example.
The camera module 11 includes an imaging lens assembly 21, an optical filter 22 and an image sensor 23.
As described above, the imaging lens assembly 21 is configured to change the position of the first lens group 311 in the optical axis direction. The imaging lens assembly 21 is further configured to change whether or not the optical path connecting the first lens group 311 and the third lens group 32 is formed, between the first shooting states and the lens storage state. The imaging lens assembly 21 is further configured to change whether or not the optical path connecting the prism 35, the second lens group 312 and the third lens group 32 is formed, between the second shooting states and the lens storage state. The imaging lens assembly 21 is also designed to maintain its good optical performance despite its small size.
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 on the imaging lens assembly 21. The image sensor 23 receives incident light from the subject (object side) via the imaging lens assembly 21 and the optical filter 22, photoelectrically converts the light, and outputs an image data, obtained by photoelectric conversion of the light, to a subsequent stage. The optical filter 22 disposed between the imaging lens assembly 21 and the image sensor 23 may be, for example, an IR (infrared) filter which cuts infrared light from incident light.
The imaging lens assembly 21 will be described in more detail. The imaging lens assembly 21 includes an optical system on the first focal length side and an optical system on the second focal length side. The optical system on the first focal length side includes the first lens group 311 including at least one lens having a positive refractive power, the third lens group 32 including at least one lens having a negative refractive power, and the mirror 33 positioned on the imaging side of the first lens group 311 on the object side of the third lens group 32. The optical system on the second focal length side includes the second lens group 312 including at least one lens having a positive refractive power, the third lens group 32 shared with the optical  system on the first focal length side, and the prism 35 positioned on an object side of the second lens group 312. The front lens group 311 is configured to change its positions in the optical axis directions between the first and second shooting state and the lens storage state, for example, by using the lens driving mechanism 24 mentioned above. The mirror 33 is configured to form the optical paths optically connecting the front lens group 311 and the third lens group 32 in the first shooting state, not to obstruct the optical path optically connecting the prism 35, the second lens group 312 and the third lens group 32 in the second shooting state, and to secure the storage space for the first lens group 311 in the lens storage state, for example, by using the mirror drive mechanism 25 mentioned above. Aperture stops 34 are disposed between most object side disposed lenses of the first lens groups 311 and the mirror 33 and between most object side disposed lenses of the second lens groups 312 and the mirror 33.
By employing such a front group collapsible imaging lens assembly 21 which changes whether or not the optical paths are formed by using the mirror 33, good optical performance can be obtained despite the small size.
The first focal length may be a short focal length, the second focal length may be a long focal length, the first shooting state may be a wide–angle shooting state, and the second shooting state may be a telephoto shooting state.
As a result, by having the third lens group 32 shared between the optical system of the short focal length side and the optical system of the long focal length side, it is possible to reduce the thickness of the housing 4 and the number of parts while ensuring the flexibility of the focal length.
Further, the first focal length in the imaging lens assembly 21 may be equal to the second focal length in the imaging lens assembly 21.
An incident direction of the incident light into the first lens group 311 may be opposite to an incident direction of the incident light into the prism. That is, the first shooting state according to the optical system on the first focal length side may be a shooting state with a rear camera 101 which shoots an object on an opposite side to a display 102 of the imaging device 100, and the second shooting state according to the optical system on the second focal length side may be a shooting state with a front camera 103 which shoots an object on a display 102 side of the imaging device 100 as shown in FIG. 1C and 1D. The rear camera 101 includes the optical system on the first focal length side which includes the first lens group 311, the mirror 33, and the third lens group 32. The front camera 103 includes the optical system on the second focal length side which includes the prism 35, the second lens group 312, and the third lens group 32.
According to such a configuration, by having the third lens group 32 shared between the front camera having the optical system on the second focal length side including the prism 35 and the rear camera having the optical system on the first focal length side including the first lens group 311, good optical performance can be obtained despite the small size of the camera module having the front camera and the rear camera.
An incident direction of the incident light into the first lens group 311 may be equal to an incident direction of the incident light into the prism 35. Such a configuration corresponds to the configuration of FIG. 1A in which the prism 35 is inversely disposed as shown in FIG. 2.
Above mentioned configurations of the camera module 11 such as the first and second focal lengths, the incident direction of the light, the center 33a of the rotation of the mirror 33 may selectively be combined with the following configurations represented by formulas (1) to (7) .
The imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (1) :
1 ≤ LG2 /LG1 < 2 (1)
In the formula (1) , LG2 is a focal length of the second lens group 312 (hereinafter the same applies) . LG1 is a focal length of the first lens group 311 (hereinafter the same applies) .
If the value of LG2 /LG1 deviates from the range of formula (1) , it is difficult to secure a balance of the optical performance between the optical system on the first focal length side and the optical system on the second focal length side, and thus it is difficult to maintain the optical performance of the imaging lens assembly 21.
Furthermore, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (2) :
5 < (∑d1 + ∑d2) / (Yh_1 + Yh_2) < 25 (2)
In the formula (2) , Σd1 is a distance on the first optical axis OA1 of the imaging lens assembly 21 from a vertex of an object side surface of a most object side disposed lens of the first lens group 311 to the imaging surface S (hereinafter the same applies) . That is, Σd1 is a full length of the imaging lens assembly 21 on the first focal length side. As described above, the first optical axis OA1 includes the optical axis OA311 of the first lens group 311 and the optical axis OA32 of the third lens group 32 which are continuous with each other at the intersection 33b with the mirror 33.
Σd2 is a distance on the second optical axis OA2 of the imaging lens assembly 21 from a reflection surface 35a of the prism 35 to the imaging surface S (hereinafter the same applies) . That is, Σd2 is a full length of the imaging lens assembly 21 on the second focal length side. As described above, the second optical axis OA2 includes the optical axis OA312 of the second lens group 312 and the optical axis OA32 of the third lens group 32 which are linearly continuous with each other. Yh_1 is an image height, which is a half-diagonal length of the imaging surface S, of the first focal length side (hereinafter the same applies) . Yh_2 is an image height, which is a half-diagonal length of the imaging surface S, of the second focal length side (hereinafter the same applies) .
If the value of (∑d1 + ∑d2) / (Yh_1 + Yh_2) deviates from the range of formula (2) , it is difficult to secure the storage space for the first lens group 311, miniaturize the imaging lens assembly 21, and maintain its optical performance.
Furthermore, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (3) :
Σd1 /f1 < 2.0 (3)
In the formula (3) , f1 is a focal length of the imaging lens assembly 21 on the first focal length side (hereinafter the same applies) . That is, f1 is a focal length of the optical system on the first focal length side.
If the value of Σd1 /f1 exceeds the upper limit value of the formula (3) , the manufacturability of the imaging lens assembly 21 decreases, and it is difficult to maintain its optical performance.
Furthermore, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (4) :
Σd2 /f2 < 2.0 (4)
In the formula (4) , f2 is a focal length of the imaging lens assembly 21 on the second focal length side (hereinafter the same applies) . That is, f2 is a focal length of the optical system on the second focal length side.
If the value of Σd2 /f2 exceeds the upper limit value of the formula (4) , the manufacturability of the imaging lens assembly 21 decreases, and it is difficult to maintain its optical performance.
Furthermore, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (5) :
LG1 /f1 <2.0 (5)
If the value of LG1 /f1 exceeds the upper limit value of the formula (5) , it is difficult to secure a balance of the optical performance between the optical system on the first focal length side and the optical system on the second focal length side, and thus it is difficult to maintain the optical performance of the imaging lens assembly 21.
Furthermore, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (6) :
LG1 /LG3< 0 (6)
In the formula (6) , LG3 is a focal length of the third lens group 32 (hereinafter the same applies) .
If the value of LG1 /LG3 exceeds the upper limit value of the formula (6) , it is difficult to secure a balance of the optical performance between the optical system on the first focal length side and the optical system on the second focal length side, and thus it is difficult to maintain the optical performance of the imaging lens assembly 21.
Furthermore, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (7) :
LG2 /LG3< 0 (7)
If the value of LG2 /LG3 exceeds the upper limit value of the formula (7) , it is difficult to secure a balance of the optical performance between the optical system on the first focal length side and the optical system on the second focal length side, and thus it is difficult to maintain the optical performance of the imaging lens assembly 21.
Furthermore, in view of lens forming, it is preferable that an aspheric lens in the imaging lens assembly 21, particularly an aspheric lens of aspheric shape having an inflection point, is formed of a plastic material. Regarding the lenses which constitute the imaging lens assembly 21, lenses having a size equal to or smaller than a specific size are preferably formed of a plastic material, and lenses larger than the specific size are preferably formed of a glass material. This is because it is difficult to form an aspheric lens or a relatively small lens using a material other than a plastic material.
Such a camera module 11 including the imaging lens assembly 21 can be used in 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 applies 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 indicated by 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. “Pr surface” indicates the reflection surface of the prism. “Pe surface” indicates the emitting surface of the prism. “R” indicates the value of a central curvature radius (mm) of the surface. Regarding “R” , “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 also applies 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.
The imaging lens assembly 21 used in the following examples includes lenses having aspheric surfaces. The aspheric shape of the lens is defined by the following formula (8) :
Z = C × h  2 / {1 + (1 -K × C  2 × h  2)  1/2} + Σ An × h  n (8)
(n = an integer greater than or equal to 3) .
In the formula (8) , 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 a conic constant (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. 3 and 4, will be described.
[Optical system on the first focal length side]
As shown in FIG. 3, in the first example, the optical system on the first focal length side of the imaging lens assembly 21 includes, in order from the object side toward the imaging surface S side, a first lens L11 belonging to the first lens group 311 and having a positive refractive power with a convex surface facing the object side, a second lens L12 belonging to the first lens group 311 and having a negative refractive power, a mirror 33, a third lens L3 belonging to the third lens group 32 and having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, and a fourth lens L4 belonging to the third lens group 32 and having a negative refractive power with concave surfaces facing the object side and the imaging surface S side. The aperture stop 34 is disposed between the second lens L12 and the mirror 33.
Table 1 shows lens data from the first focal length side of the first example. The unit of length or distance shown in each of the following tables is mm. Table 2 shows a focal length of each lens, a focal length LG1 of the first lens group 311, and a focal length LG3 of the third lens group 32. Table 3 shows the focal length f1 of the imaging lens assembly 21 on the first focal length side, the F number Fno, the angle of view 2ω, the full length ∑d1 of the imaging lens assembly 21 on the first focal length side which is obtained when an object point is taken at infinity, the distance ∑Ld1 on the optical axis OA311 of the first lens group 311 from a vertex of an object side surface of a most object side disposed lens of the first lens group 311 to the mirror 33, the distance ∑Ld2 on the optical axis OA32 of the third lens group 32 from the mirror 33 to the imaging surface S, and the image height Yh_1 of the first focal length side. Table 4 shows the aspheric coefficients on the first focal length side of the imaging lens assembly 21.
TABLE1
Si Ri Di Ndi νd i
1 (Virtual Surface)        
2 (L11 1st Surface) 4.411 1.200 1.5439 56.07
3 (L11 2nd Surface) 31.615 0.500    
4 (L12 1st Surface) -8.973 0.800 1.6349 23.97
5 (L12 2nd Surface) -46.188 0.500    
6 (Aperture Stop)   4.873    
7 (Mirror)   4.063    
8 (L3 1st Surface) 7.497 2.600 1.5439 56.07
9 (L3 2nd Surface) -27.008 0.856    
10 (L4 1st Surface) -7.842 0.400 1.6349 23.97
11 (L4 2nd Surface) 11.888 0.500    
12 (Optical Filter)   0.210 1.5168 64.17
13 (Image Plane)   0.072    
TABLE2                                 TABLE3
Figure PCTCN2021107170-appb-000001
TABLE4
  S2 (L11 1st Surface) S3 (L11 2nd Surface) S4 (L12 1st Surface)
R 4.410914122 31.61481134 -8.972838933
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 7.796231156462470E-04 8.704844694510290E-04 7.191326660488500E-03
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 1.381979410611530E-04 3.684934907822170E-04 2.749895276577850E-04
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 3.246791123735080E-07 3.034248740984640E-05 -1.782204782453850E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 7.471069721557470E-07 -2.766586419450370E-06 -2.889078863582960E-06
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 4.241364236970070E-08 -5.239751961177540E-07 -2.730922906329450E-07
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 (L12 2nd Surface) S8 (L3 1st Surface) S9 (L3 2nd Surface)
R -46.18757057 7.496754471 -27.00796728
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 8.487500612743640E-03 -4.752200000000000E-05 -2.096440000000000E-04
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 2.466062402637530E-04 -1.360000000000000E-06 8.150000000000000E-06
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -5.876012575697090E-06 -2.534930000000000E-06 -1.986210000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 -4.387294433630390E-06 2.160000000000000E-07 2.420000000000000E-07
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 5.984933706650980E-07 -1.380000000000000E-08 2.620000000000000E-07
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 -2.180000000000000E-08
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
  S10 (L4 1st Surface) S11 (L4 2nd Surface)
R -7.842296776 11.88848305
K 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00
A4 2.540941000000000E-03 2.400000000000000E-03
A5 0.000000000000000E+00 0.000000000000000E+00
A6 -8.910120000000000E-05 -1.350000000000000E-04
A7 0.000000000000000E+00 0.000000000000000E+00
A8 -6.810000000000000E-06 3.570000000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00
A10 7.930000000000000E-07 -1.780000000000000E-05
A11 0.000000000000000E+00 0.000000000000000E+00
A12 1.310000000000000E-07 4.040000000000000E-06
A13 0.000000000000000E+00 0.000000000000000E+00
A14 -1.670000000000000E-08 -2.820000000000000E-07
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
[Optical system on the second focal length side]
As shown in FIG. 4, in the first example, the optical system on the second focal length side of the imaging lens assembly 21 includes, in order from the object side toward the imaging surface S side, the prism 35 having a reflection surface 35a which reflects the incident light from the object side to the second lens group 312, a first lens L21 belonging to the second lens group 312 and having a positive refractive power with a convex surface facing the object side, a second lens L22 belonging to the second lens group 312 and having a negative refractive power, a third lens L3 belonging to the third lens group 32 and having a positive refractive power with convex surfaces facing the object side and the imaging surface S side, and a fourth lens L4 belonging to the third lens group 32 and having a negative refractive power with concave surfaces facing the object side and the imaging surface S side. The third lens L3 and the fourth lens L4 are the same as those of the optical system on the first focal length side. The aperture stop 34 is disposed between the second lens L22 and the third lens L3.
Table 5 shows lens data from the second focal length side of the first example. Table 6 shows a focal length of each lens, a focal length LG2 of the second lens group 312, and a focal length LG3 of the third lens group 32. Table 7 shows the focal length f2 of the imaging lens assembly 21 on the second focal length side, the F number Fno, the angle of view 2ω, the full length ∑d2 of the imaging lens assembly 21 on the second focal length side which is obtained when an object point is taken at infinity, and the image height Yh_2 of the second focal length side. Table 8 shows the aspheric coefficients on the second focal length side of the imaging lens assembly 21.
TABLE5
Si Ri Di Ndi νd i
1 (Virtual Surface)        
2 (Pr Surface)   3.500 1.5168 64.17
3 (Pe Surface)   0.500    
4 (L21 1st Surface) 6.675 1.500 1.5439 56.07
5 (L21 2nd Surface) 71.081 0.450    
6 (L22 1st Surface) -7.394 0.585 1.6349 23.97
7 (L22 2nd Surface) -13.363 0.200    
8 (Aperture Stop)    17.186    
9 (L3 1st Surface) 7.497 2.600 1.5439 56.07
10 (L3 2nd Surface) -27.008 0.856    
11 (L4 1st Surface) -7.842 0.400 1.6349 23.97
12 (L4 2nd Surface) 11.888 0.500    
13 (Optical Filter)   0.210 1.5168 64.17
14 (Image Plane)   0.072    
TABLE6
Lens Focal Length
L21 13.45
L22 -27.11
L3 11.10
L4 -7.38
LG2 24.79
LG3 -58.32
TABLE7
f2 20.00
Fn o 3.54
2ω 13.60
Σd2 28.56
Y h_2 2.35
TABLE8
  S4 (L21 1st Surface) S5 (L21 2nd Surface) S6 (L22 1st Surface)
R 6.675056324 71.08135137 -7.394332815
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 7.929278088657610E-04 1.122636771260660E-03 6.198320082211080E-03
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 2.664534834586900E-05 1.444774817764340E-04 5.838132907893380E-05
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -2.166895300232820E-06 -2.180492886780910E-06 -2.271605306141170E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 9.250748697287540E-08 -2.244672493609720E-06 -5.214257306155690E-07
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 1.652192079990260E-08 1.606025675436760E-07 1.085198773099280E-07
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
  S7 (L22 2nd Surface) S9 (L3 1st Surface) S10 (L3 2nd Surface)
R -13.36262991 7.496754471 -27.00796728
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 5.775393985002090E-03 -4.752200000000000E-05 -2.096440000000000E-04
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 -1.896942862457370E-06 -1.360000000000000E-06 8.150000000000000E-06
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.181242003677500E-05 -2.534930000000000E-06 -1.986210000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 -5.087032644077150E-07 2.160000000000000E-07 2.420000000000000E-07
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 9.922050030316430E-08 -1.380000000000000E-08 2.620000000000000E-07
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 -2.180000000000000E-08
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
  S11 (L4 1st Surface) S12 (L4 2nd Surface)
R -7.842296776 11.88848305
K 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00
A4 2.540941000000000E-03 2.400000000000000E-03
A5 0.000000000000000E+00 0.000000000000000E+00
A6 -8.910120000000000E-05 -1.350000000000000E-04
A7 0.000000000000000E+00 0.000000000000000E+00
A8 -6.810000000000000E-06 3.570000000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00
A10 7.930000000000000E-07 -1.780000000000000E-05
A11 0.000000000000000E+00 0.000000000000000E+00
A12 1.310000000000000E-07 4.040000000000000E-06
A13 0.000000000000000E+00 0.000000000000000E+00
A14 -1.670000000000000E-08 -2.820000000000000E-07
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
Table 9 shows values corresponding to the conditional expressions.
TABLE 9
1≦LG2/LG1<2 1.46
5＜ (Σd1+Σd2) / (Yh_1+Yh_2) ＜25 19.21
Σd1/f1＜2.0 1.21
Σd2/f2＜2.0 1.43
LG1/f1＜2.0 1.24
LG1/LG3<0 -0.29
LG2/LG3<0 -0.43
Aberrations on the first focal length side of the first example are shown in FIG. 5. FIG. 5 shows, as examples of aberrations, spherical aberration, astigmatism (field curvature) and distortion. 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. “IMG HT” indicates an image height. The same applies to aberration diagrams in other examples.
Aberrations on the second focal length side of the first example are shown in FIG. 6.
As can be seen from the aberration diagrams in FIG. 5 and 6, 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.
[Second example]
Next, a second example, in which specific numerical values are applied to the camera module 11 shown in FIG. 7 and 8, will be described.
[Optical system on the first focal length side]
The optical system on the first focal length side of the imaging lens assembly 21 according to the second example is shown in FIG. 7. Lens parameters corresponding to those in the first example are shown in Tables 10-13.
TABLE 10
Si Ri Di Ndi νd i
1 (Virtual Surface)        
2 (L11 1st Surface) 6.526 2.000 1.5439 56.07
3 (L11 2nd Surface) -80.921 0.250    
4 (L12 1st Surface) -6.314 1.000 1.6349 23.97
5 (L12 2nd Surface) -11.773 0.050    
6 (Aperture Stop)   6.330    
7 (Mirror)   5.000    
8 (L3 1st Surface) 4.742 2.000 1.5439 56.07
9 (L3 2nd Surface) 21.321 1.000    
10 (L4 1st Surface) -18.592 0.800 1.6349 23.97
11 (L4 2nd Surface) 6.647 1.000    
12 (Optical Filter)   0.210 1.5168 64.17
13 (Image Plane)   0.202    
TABLE 11
Lens Focal Length
L11 11.21
L12 -23.09
L3 10.77
L4 -7.62
LG1 20.57
LG3 -415.50
TABLE 12
f1 15.00
Fno 2.74
2ω 18.17
Σd1 19.84
ΣLd1 9.63
ΣLd2 10.21
Yh_1 2.35
TABLE 13
  S2 (L11 1st Surface) S3 (L11 2nd Surface) S4 (L12 1st Surface)
R 6.525501994 -80.92140306 -6.313563832
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 -1.561464468877150E-04 2.040821419317100E-04 6.657400225517260E-03
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 -3.018956836603460E-05 9.700757022170380E-05 7.649873566571300E-05
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.095405828718410E-05 -1.304425147783240E-05 -1.690959940451090E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 4.681938038039550E-08 -3.384274500203850E-06 6.662424918148170E-07
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -2.493034438615690E-08 2.106144375501220E-07 -4.330239717425400E-08
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 (L12 2nd Surface) S8 (L3 1st Surface) S9 (L3 2nd Surface)
R -11.77258409 4.742398784 21.32122592
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 5.583345894658100E-03 5.360000000000000E-04 9.420000000000000E-04
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 3.725556295277710E-05 5.490000000000000E-06 -3.200000000000000E-05
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.328194560413400E-05 8.570000000000000E-06 3.700000000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 3.135115862990780E-06 -1.770000000000000E-07 9.530000000000000E-08
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -1.699916004239420E-07 2.480000000000000E-08 1.590000000000000E-07
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 -4.070000000000000E-08
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
  S10 (L4 1st Surface) S11 (L4 2nd Surface)
R -18.59161801 6.646730899
K 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00
A4 -1.330000000000000E-03 -1.570000000000000E-03
A5 0.000000000000000E+00 0.000000000000000E+00
A6 4.300000000000000E-04 2.800000000000000E-04
A7 0.000000000000000E+00 0.000000000000000E+00
A8 4.970000000000000E-05 2.560000000000000E-04
A9 0.000000000000000E+00 0.000000000000000E+00
A10 -4.070000000000000E-07 -5.330000000000000E-05
A11 0.000000000000000E+00 0.000000000000000E+00
A12 -1.130000000000000E-06 8.140000000000000E-06
A13 0.000000000000000E+00 0.000000000000000E+00
A14 3.490000000000000E-08 -4.510000000000000E-07
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
[Optical system on the second focal length side]
The optical system on the second focal length side of the imaging lens assembly 21 according to the second example is shown in FIG. 8. Lens parameters corresponding to those in the first example are shown in Tables 14-17.
TABLE 14
Si Ri Di Ndi νd i
1 (Virtual Surface)        
2 (Pr Surface)   3.500 1.5168 64.17
3 (Pe Surface)   0.500    
4 (L21 1st Surface) 13.789 1.426 1.5439 56.07
5 (L21 2nd Surface) -22.564 0.300    
6 (L22 1st Surface) -35.328 0.500 1.6349 23.97
7 (L22 2nd Surface) 54.398 0.300    
8 (Aperture Stop)    20.000    
9 (L3 1st Surface) 4.742 2.000 1.5439 56.07
10 (L3 2nd Surface) 21.321 1.000    
11 (L4 1st Surface) -18.592 0.800 1.6349 23.97
12 (L4 2nd Surface) 6.647 1.000    
13 (Optical Filter)   0.210 1.5168 64.17
14 (Image Plane)   0.202    
TABLE 15
Figure PCTCN2021107170-appb-000002
TABLE 17
  S4 (L21 1st Surface) S5 (L21 2nd Surface) S6 (L22 1st Surface)
R 13.78947865 -22.56364628 -35.32805437
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 -1.770216546845490E-04 -7.243875223022810E-05 9.709837631508290E-05
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 -5.893832975371500E-06 -1.238829401246780E-05 6.255288992169690E-06
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.592790122410170E-06 -1.087260118457520E-06 2.695069622415690E-07
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 2.961415090395080E-08 -4.806269817934110E-08 -9.484946232006380E-08
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -2.415883935876260E-09 4.478407946654580E-09 7.515027588982370E-09
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
  S7 (L22 2nd Surface) S9 (L3 1st Surface) S10 (L3 2nd Surface)
R 54.3978855 4.742398784 21.32122592
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 3.105966990197370E-05 5.360000000000000E-04 9.420000000000000E-04
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 1.715708886147400E-05 5.490000000000000E-06 -3.200000000000000E-05
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.385610092204180E-06 8.570000000000000E-06 3.700000000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 1.223322579789730E-07 -1.770000000000000E-07 9.530000000000000E-08
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -5.369058994683230E-09 2.480000000000000E-08 1.590000000000000E-07
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 -4.070000000000000E-08
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
  S11 (L4 1st Surface) S12 (L4 2nd Surface)
R -18.59161801 6.646730899
K 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00
A4 -1.330000000000000E-03 -1.570000000000000E-03
A5 0.000000000000000E+00 0.000000000000000E+00
A6 4.300000000000000E-04 2.800000000000000E-04
A7 0.000000000000000E+00 0.000000000000000E+00
A8 4.970000000000000E-05 2.560000000000000E-04
A9 0.000000000000000E+00 0.000000000000000E+00
A10 -4.070000000000000E-07 -5.330000000000000E-05
A11 0.000000000000000E+00 0.000000000000000E+00
A12 -1.130000000000000E-06 8.140000000000000E-06
A13 0.000000000000000E+00 0.000000000000000E+00
A14 3.490000000000000E-08 -4.510000000000000E-07
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
Table 18 shows values corresponding to the conditional expressions.
TABLE 18
1≦LG2/LG1<2 1.40
5＜ (Σd1+Σd2) / (Yh_1+Yh_2) ＜25 21.95
Σd1/f1＜2.0 1.32
Σd2/f2＜2.0 1.51
LG1/f1＜2.0 1.37
LG1/LG3<0 -0.05
LG2/LG3<0 -0.07
Aberrations on the first focal length side in the second example are shown in FIG. 9. Aberrations on the second focal length side in the second example are shown in FIG. 10.
According to the second example, by making the lens parameters different from those of the first example, the degree of freedom in designing the camera module 11 according to the present disclosure can be increased while obtaining the same effects as in the first example.
[Third example]
Next, a third example, in which specific numerical values are applied to the camera module 11 shown in FIG. 11 and 12, will be described.
[Optical system on the first focal length side]
The optical system on the first focal length side of the imaging lens assembly 21 according to the third example is shown in FIG. 11. Lens parameters corresponding to those in the first example are shown in Tables 19 -22.
TABLE 19
Si Ri Di Ndi νd i
1 (Virtual Surface)        
2 (L11 1st Surface) 4.805 1.520 1.5439 56.07
3 (L11 2nd Surface) 50.121 0.250    
4 (L12 1st Surface) -5.287 1.000 1.6349 23.97
5 (L12 2nd Surface) -9.734 0.050    
6 (Aperture Stop)    3.843    
7 (Mirror)   5.000    
8 (L3 1st Surface) 4.740 2.000 1.5439 56.07
9 (L3 2nd Surface) 21.321 1.000    
10 (L4 1st Surface) -18.592 0.800 1.6349 23.97
11 (L4 2nd Surface) 6.647 1.000    
12 (Optical Filter)   0.210 1.5168 64.17
13 (Image Plane)   0.201    
TABLE 20
Lens Focal Length
L11 9.67
L12 -19.97
L3 10.76
L4 -7.62
LG1 17.83
LG3 -429.86
TABLE 21
f1 13.00
Fno 2.77
2ω 20.95
Σd1 16.87
ΣLd1 6.66
ΣLd2 10.21
Yh_1 2.35
TABLE 22
  S2 (L11 1st Surface) S3 (L11 2nd Surface) S4 (L12 1st Surface)
R 4.805277999 50.12133065 -5.287404732
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 8.233889780134970E-05 1.620002089503830E-03 1.177562293298670E-02
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 -9.578382722485000E-05 1.063737648006800E-04 4.545716358594500E-05
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -3.841355232928060E-05 -9.072015118356620E-05 -2.158423024365230E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 -3.332691838084570E-06 -1.362832402038300E-05 1.413387451927070E-06
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -1.529467292862350E-07 1.481685820032430E-06 -3.077374716596410E-07
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 (L12 2nd Surface) S8 (L3 1st Surface) S9 (L3 2nd Surface)
R -9.734149764 4.74 21.32122592
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 9.341283661863760E-03 5.360000000000000E-04 9.422170000000000E-04
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 1.082085123163560E-04 5.490000000000000E-06 -3.198100000000000E-05
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -3.161408320405850E-06 8.570000000000000E-06 3.700310000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 1.281224134964940E-05 -1.770000000000000E-07 9.530000000000000E-08
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -1.019849993197830E-06 2.480000000000000E-08 1.590000000000000E-07
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 -4.070000000000000E-08
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
  S10 (L4 1st Surface) S11 (L4 2nd Surface)
R -18.59161801 6.646730899
K 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00
A4 -1.327509000000000E-03 -1.567845000000000E-03
A5 0.000000000000000E+00 0.000000000000000E+00
A6 4.295020000000000E-04 2.798640000000000E-04
A7 0.000000000000000E+00 0.000000000000000E+00
A8 4.973280000000000E-05 2.556520000000000E-04
A9 0.000000000000000E+00 0.000000000000000E+00
A10 -4.070000000000000E-07 -5.328010000000000E-05
A11 0.000000000000000E+00 0.000000000000000E+00
A12 -1.130000000000000E-06 8.141540000000000E-06
A13 0.000000000000000E+00 0.000000000000000E+00
A14 3.490000000000000E-08 -4.510000000000000E-07
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
[Optical system on the second focal length side]
The optical system on the second focal length side of the imaging lens assembly 21 according to the third example is shown in FIG. 12. Lens parameters corresponding to those in the first example are shown in Tables 23 -26.
TABLE 23
Si Ri Di Ndi νd i
1 (Virtual Surface)        
2 (Pr Surface)   3.500 1.5168 64.17
3 (Pe Surface)   0.700    
4 (L21 1st Surface) 13.789 1.426 1.5439 56.07
5 (L21 2nd Surface) -22.564 0.300    
6 (L22 1st Surface) -35.328 0.500 1.6349 23.97
7 (L22 2nd Surface) 54.398 0.300    
8 (Aperture Stop)   20.000    
9 (L3 1st Surface) 4.740 2.000 1.5439 56.07
10 (L3 2nd Surface) 21.321 1.000    
11 (L4 1st Surface) -18.592 0.800 1.6349 23.97
12 (L4 2nd Surface) 6.647 1.000    
13 (Optical Filter)   0.210 1.5168 64.17
14 (Image Plane)   0.201    
TABLE 24
Figure PCTCN2021107170-appb-000003
TABLE 26
  S4 (L21 1st Surface) S5 (L21 2nd Surface) S6 (L22 1st Surface)
R 13.78947865 -22.56364628 -35.32805437
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 -1.770216546845490E-04 -7.243875223022810E-05 9.709837631508290E-05
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 -5.893832975371500E-06 -1.238829401246780E-05 6.255288992169690E-06
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.592790122410170E-06 -1.087260118457520E-06 2.695069622415690E-07
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 2.961415090395080E-08 -4.806269817934110E-08 -9.484946232006380E-08
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -2.415883935876260E-09 4.478407946654580E-09 7.515027588982370E-09
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
  S7 (L22 2nd Surface) S9 (L3 1st Surface) S10 (L3 2nd Surface)
R 54.3978855 4.74 21.32122592
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 3.105966990197370E-05 5.360000000000000E-04 9.422170000000000E-04
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 1.715708886147400E-05 5.490000000000000E-06 -3.198100000000000E-05
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.385610092204180E-06 8.570000000000000E-06 3.700310000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 1.223322579789730E-07 -1.770000000000000E-07 9.530000000000000E-08
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -5.369058994683230E-09 2.480000000000000E-08 1.590000000000000E-07
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 -4.070000000000000E-08
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
  S11 (L4 1st Surface) S12 (L4 2nd Surface)
R -18.59161801 6.646730899
K 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00
A4 -1.327509000000000E-03 -1.567845000000000E-03
A5 0.000000000000000E+00 0.000000000000000E+00
A6 4.295020000000000E-04 2.798640000000000E-04
A7 0.000000000000000E+00 0.000000000000000E+00
A8 4.973280000000000E-05 2.556520000000000E-04
A9 0.000000000000000E+00 0.000000000000000E+00
A10 -4.070000000000000E-07 -5.328010000000000E-05
A11 0.000000000000000E+00 0.000000000000000E+00
A12 -1.130000000000000E-06 8.141540000000000E-06
A13 0.000000000000000E+00 0.000000000000000E+00
A14 3.490000000000000E-08 -4.510000000000000E-07
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
Table 27 shows values corresponding to the conditional expressions.
TABLE 27
1≦LG2/LG1<2 1.61
5＜ (Σd1+Σd2) / (Yh_1+Yh_2) ＜25 20.77
Σd1/f1＜2.0 1.30
Σd2/f2＜2.0 1.52
LG1/f1＜2.0 1.37
LG1/LG3<0 -0.04
LG2/LG3<0 -0.07
Aberrations on the first focal length side in the third example are shown in FIG. 13. Aberrations on the second focal length side in the third example are shown in FIG. 14. 
According to the third example, by making the lens parameters different from those of the first and second examples, the degree of freedom in designing the camera module 11 according to the present disclosure can be further increased while obtaining the same effects as in the first example.
[Fourth example]
Next, a fourth example, in which specific numerical values are applied to the camera module 11 shown in FIG. 15 and 16, will be described.
[Optical system on the first focal length side]
The optical system on the first focal length side of the imaging lens assembly 21 according to the fourth example is shown in FIG. 15. Lens parameters corresponding to those in the first example are shown in Tables 28 -31.
TABLE 28
Si Ri Di Ndi νd i
1 (Virtual Surface)        
2 (L11 1st Surface) 6.526 2.000 1.5439 56.07
3 (L11 2nd Surface) -80.921 0.250    
4 (L12 1st Surface) -6.314 1.000 1.6349 23.97
5 (L12 2nd Surface) -11.773 0.050    
6 (Aperture Stop)    6.330    
7 (Mirror)   5.000    
8 (L3 1st Surface) 4.742 2.000 1.5439 56.07
9 (L3 2nd Surface) 21.321 1.000    
10 (L4 1st Surface) -18.592 0.800 1.6349 23.97
11 (L4 2nd Surface) 6.647 1.000    
12 (Optical Filter)   0.210 1.5168 64.17
13 (Image Plane)   0.202    
TABLE 29
Lens Focal Length
L11 11.21
L12 -23.09
L3 10.77
L4 -7.62
L G1 20.57
L G3 -415.50
TABLE 30
f1 15.00
Fno 2.74
2ω 18.17
Σd1 19.84
ΣLd1 9.63
ΣLd2 10.21
Yh_1 2.35
TABLE 31
  S2 (L11 1st Surface) S3 (L11 2nd Surface) S4 (L12 1st Surface)
R 6.525501994 -80.92140306 -6.313563832
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 -1.561464468877150E-04 2.040821419317100E-04 6.657400225517260E-03
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 -3.018956836603460E-05 9.700757022170380E-05 7.649873566571300E-05
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.095405828718410E-05 -1.304425147783240E-05 -1.690959940451090E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 4.681938038039550E-08 -3.384274500203850E-06 6.662424918148170E-07
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -2.493034438615690E-08 2.106144375501220E-07 -4.330239717425400E-08
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 (L12 2nd Surface) S8 (L3 1st Surface) S9 (L3 2nd Surface)
R -11.77258409 4.742398784 21.32122592
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 5.583345894658100E-03 5.356070000000000E-04 9.422170000000000E-04
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 3.725556295277710E-05 5.490000000000000E-06 -3.198100000000000E-05
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.328194560413400E-05 8.570000000000000E-06 3.700310000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 3.135115862990780E-06 -1.770000000000000E-07 9.530000000000000E-08
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -1.699916004239420E-07 2.480000000000000E-08 1.590000000000000E-07
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 -4.070000000000000E-08
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
  S10 (L4 1st Surface) S11 (L4 2nd Surface)
R -18.59161801 6.646730899
K 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00
A4 -1.327509000000000E-03 -1.567845000000000E-03
A5 0.000000000000000E+00 0.000000000000000E+00
A6 4.295020000000000E-04 2.798640000000000E-04
A7 0.000000000000000E+00 0.000000000000000E+00
A8 4.973280000000000E-05 2.556520000000000E-04
A9 0.000000000000000E+00 0.000000000000000E+00
A10 -4.070000000000000E-07 -5.328010000000000E-05
A11 0.000000000000000E+00 0.000000000000000E+00
A12 -1.130000000000000E-06 8.141540000000000E-06
A13 0.000000000000000E+00 0.000000000000000E+00
A14 3.490000000000000E-08 -4.510000000000000E-07
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
[Optical system on the second focal length side]
The optical system on the second focal length side of the imaging lens assembly 21 according to the fourth example is shown in FIG. 16. Lens parameters corresponding to those in the first example are shown in Tables 32 -35.
TABLE 32
Si Ri Di Ndi νd i
1 (Virtual Surface)        
2 (Pr Surface)   3.700 1.5168 64.17
3 (Pe Surface)   0.700    
4 (L21 1st Surface) 6.526 2.000 1.5439 56.07
5 (L21 2nd Surface) -80.921 0.250    
6 (L22 1st Surface) -6.314 1.000 1.6349 23.97
7 (L22 2nd Surface) -11.773 0.050    
8 (Aperture Stop)    11.330    
9 (L3 1st Surface) 4.742 2.000 1.5439 56.07
10 (L3 2nd Surface) 21.321 1.000    
11 (L4 1st Surface) -18.592 0.800 1.6349 23.97
12 (L4 2nd Surface) 6.647 1.000    
13 (Optical Filter)   0.210 1.5168 64.17
14 (Image Plane)   0.202    
TABLE 33
Figure PCTCN2021107170-appb-000004
TABLE 35
  S4 (L21 1st Surface) S5 (L21 2nd Surface) S6 (L22 1st Surface)
R 6.525501994 -80.92140306 -6.313563832
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 -1.561464468877150E-04 2.040821419317100E-04 6.657400225517260E-03
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 -3.018956836603460E-05 9.700757022170380E-05 7.649873566571300E-05
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.095405828718410E-05 -1.304425147783240E-05 -1.690959940451090E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 4.681938038039550E-08 -3.384274500203850E-06 6.662424918148170E-07
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -2.493034438615690E-08 2.106144375501220E-07 -4.330239717425400E-08
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
  S7 (L22 2nd Surface) S9 (L3 1st Surface) S10 (L3 2nd Surface)
R -11.77258409 4.742398784 21.32122592
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 5.583345894658100E-03 5.356070000000000E-04 9.422170000000000E-04
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 3.725556295277710E-05 5.490000000000000E-06 -3.198100000000000E-05
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -1.328194560413400E-05 8.570000000000000E-06 3.700310000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 3.135115862990780E-06 -1.770000000000000E-07 9.530000000000000E-08
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 -1.699916004239420E-07 2.480000000000000E-08 1.590000000000000E-07
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 -4.070000000000000E-08
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
  S11 (L4 1st Surface) S12 (L4 2nd Surface)
R -18.59161801 6.646730899
K 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00
A4 -1.327509000000000E-03 -1.567845000000000E-03
A5 0.000000000000000E+00 0.000000000000000E+00
A6 4.295020000000000E-04 2.798640000000000E-04
A7 0.000000000000000E+00 0.000000000000000E+00
A8 4.973280000000000E-05 2.556520000000000E-04
A9 0.000000000000000E+00 0.000000000000000E+00
A10 -4.070000000000000E-07 -5.328010000000000E-05
A11 0.000000000000000E+00 0.000000000000000E+00
A12 -1.130000000000000E-06 8.141540000000000E-06
A13 0.000000000000000E+00 0.000000000000000E+00
A14 3.490000000000000E-08 -4.510000000000000E-07
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
Table 36 shows values corresponding to the conditional expressions.
TABLE 36
1≦LG2/LG1<2 1.00
5＜ (Σd1+Σd2) / (Yh_1+Yh_2) ＜25 18.76
Σd1/f1＜2.0 1.32
Σd2/f2＜2.0 1.62
LG1/f1＜2.0 1.37
LG1/LG3<0 -0.05
LG2/LG3<0 -0.05
Aberrations on the first focal length side in the fourth example are shown in FIG. 17. Aberrations on the second focal length side in the fourth example are shown in FIG. 18.
According to the fourth example, by making the lens parameters different from those of the first to third examples, the degree of freedom in designing the camera module 11 according to the present disclosure can be further increased while obtaining the same effects as in the first example.
[Fifth example]
Next, a fifth example, in which specific numerical values are applied to the camera module 11 shown in FIG. 19 and 20, will be described.
[Optical system on the first focal length side]
The optical system on the first focal length side of the imaging lens assembly 21 according to the fifth example is shown in FIG. 19. Lens parameters corresponding to those in the first example are shown in Tables 37 -40.
TABLE 37
Si Ri Di Ndi νd i
1 (Virtual Surface)        
2 (L11 1st Surface) 4.411 1.200 1.5439 56.07
3 (L11 2nd Surface) 31.615 0.500    
4 (L12 1st Surface) -8.973 0.800 1.6349 23.97
5 (L12 2nd Surface) -46.188 0.500    
6 (Aperture Stop)    4.873    
7 (M irror)   4.063    
8 (L3 1st Surface) 7.497 2.600 1.544 56.07
9 (L3 2nd Surface) -27.008 0.856    
10 (L4 1st Surface) -7.842 0.400 1.635 23.97
11 (L4 2nd Surface) 11.888 0.500    
12 (Optical Filter)   0.210 1.517 64.17
13 (Image Plane)   0.072    
TABLE 38                                             TABLE 39
Figure PCTCN2021107170-appb-000005
TABLE 40
  S2 (L11 1st Surface) S3 (L11 2nd Surface) S4 (L12 1st Surface)
R 4.410914122 31.61481134 -8.972838933
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 7.796231156462470E-04 8.704844694510290E-04 7.191326660488500E-03
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 1.381979410611530E-04 3.684934907822170E-04 2.749895276577850E-04
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 3.246791123735080E-07 3.034248740984640E-05 -1.782204782453850E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 7.471069721557470E-07 -2.766586419450370E-06 -2.889078863582960E-06
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 4.241364236970070E-08 -5.239751961177540E-07 -2.730922906329450E-07
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 (L12 2nd Surface) S8 (L3 1st Surface) S9 (L3 2nd Surface)
R -46.18757057 7.496754471 -27.00796728
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 8.487500612743640E-03 -4.750000000000000E-05 -2.096440000000000E-04
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 2.466062402637530E-04 -1.360000000000000E-06 8.150000000000000E-06
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -5.876012575697090E-06 -2.530000000000000E-06 -1.990000000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 -4.387294433630390E-06 2.160000000000000E-07 2.420000000000000E-07
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 5.984933706650980E-07 -1.380000000000000E-08 2.620000000000000E-07
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 -2.180000000000000E-08
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
  S10 (L4 1st Surface) S11 (L4 2nd Surface)
R -7.842296776 11.88848305
K 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00
A4 2.540941000000000E-03 2.403614000000000E-03
A5 0.000000000000000E+00 0.000000000000000E+00
A6 -8.910000000000000E-05 -1.352160000000000E-04
A7 0.000000000000000E+00 0.000000000000000E+00
A8 -6.810000000000000E-06 3.570000000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00
A10 7.930000000000000E-07 -1.780000000000000E-05
A11 0.000000000000000E+00 0.000000000000000E+00
A12 1.310000000000000E-07 4.040000000000000E-06
A13 0.000000000000000E+00 0.000000000000000E+00
A14 -1.670000000000000E-08 -2.820000000000000E-07
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
[Optical system on the second focal length side]
The optical system on the second focal length side of the imaging lens assembly 21 according to the fifth example is shown in FIG. 20. Lens parameters corresponding to those in the first example are shown in Tables 41 -44.
TABL E 41
Si Ri Di Ndi νd i
1 (Virtual Surface)        
2 (Pr Surface)   3.500 1.5168 64.17
3 (Pe Surface)   0.800    
4 (L21 1st Surface) 4.411 1.200 1.5439 56.07
5 (L21 2nd Surface) 31.615 0.500    
6 (L22 1st Surface) -8.973 0.800 1.6349 23.97
7 (L22 2nd Surface) -46.188 0.500    
8 (Aperture Stop)    8.936    
9 (L3 1st Surface) 7.497 2.600 1.544 56.07
10 (L3 2nd Surface) -27.008 0.856    
11 (L4 1st Surface) -7.842 0.400 1.635 23.97
12 (L4 2nd Surface) 11.888 0.500    
13 (Optical Filter)   0.210 1.517 64.17
14 (Image Plane)   0.072    
TABLE 42
Figure PCTCN2021107170-appb-000006
TABLE 44
  S4 (L21 1st Surface) S5 (L21 2nd Surface) S6 (L22 1st Surface)
R 4.410914122 31.61481134 -8.972838933
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 7.796231156462470E-04 8.704844694510290E-04 7.191326660488500E-03
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 1.381979410611530E-04 3.684934907822170E-04 2.749895276577850E-04
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 3.246791123735080E-07 3.034248740984640E-05 -1.782204782453850E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 7.471069721557470E-07 -2.766586419450370E-06 -2.889078863582960E-06
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 4.241364236970070E-08 -5.239751961177540E-07 -2.730922906329450E-07
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
  S7 (L22 2nd Surface) S9 (L3 1st Surface) S10 (L3 2nd Surface)
R -46.18757057 7.496754471 -27.00796728
K 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A4 8.487500612743640E-03 -4.750000000000000E-05 -2.096440000000000E-04
A5 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A6 2.466062402637530E-04 -1.360000000000000E-06 8.150000000000000E-06
A7 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A8 -5.876012575697090E-06 -2.530000000000000E-06 -1.990000000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A10 -4.387294433630390E-06 2.160000000000000E-07 2.420000000000000E-07
A11 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A12 5.984933706650980E-07 -1.380000000000000E-08 2.620000000000000E-07
A13 0.000000000000000E+00 0.000000000000000E+00 0.000000000000000E+00
A14 0.000000000000000E+00 0.000000000000000E+00 -2.180000000000000E-08
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
  S11 (L4 1st Surface) S12 (L4 2nd Surface)
R -7.842296776 11.88848305
K 0.000000000000000E+00 0.000000000000000E+00
A3 0.000000000000000E+00 0.000000000000000E+00
A4 2.540941000000000E-03 2.403614000000000E-03
A5 0.000000000000000E+00 0.000000000000000E+00
A6 -8.910000000000000E-05 -1.352160000000000E-04
A7 0.000000000000000E+00 0.000000000000000E+00
A8 -6.810000000000000E-06 3.570000000000000E-05
A9 0.000000000000000E+00 0.000000000000000E+00
A10 7.930000000000000E-07 -1.780000000000000E-05
A11 0.000000000000000E+00 0.000000000000000E+00
A12 1.310000000000000E-07 4.040000000000000E-06
A13 0.000000000000000E+00 0.000000000000000E+00
A14 -1.670000000000000E-08 -2.820000000000000E-07
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
Table 45 shows values corresponding to the conditional expressions.
TABLE 45
1≦LG2/LG1<2 1.00
5＜ (Σd1+Σd2) / (Yh_1+Yh_2) ＜25 8.88
Σd1/f1＜2.0 1.52
Σd2/f2＜2.0 1.52
LG1/f1＜2.0 1.24
LG1/LG3<0 -0.29
LG2/LG3<0 -0.29
Aberrations on the first focal length side in the fifth example are shown in FIG. 21. Aberrations on the second focal length side in the fifth example are shown in FIG. 22.
According to the fifth example, by making the lens parameters different from those of the first to fourth examples, the degree of freedom in designing the camera module 11 according to the present disclosure can be further increased while obtaining the same effects as in the first example.
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 according 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.
Although embodiments of the present disclosure have been shown and described, it should 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 (20)

  1. An imaging lens assembly, comprising:
    a first lens group for shooting at a first focal length;
    a second lens group for shooting at a second focal length;
    a third lens group for shooting at the first focal length and the second focal length;
    a mirror positioned on an imaging side of the first lens group and the second lens group on an object side of the third lens group; and
    a prism positioned on an object side of the second lens group, wherein
    the first lens group is configured to change its position in an optical axis direction between a first shooting state, where shooting at the first focal length is performed, and a lens storage state, and between a second shooting state, where shooting at the second focal length is performed, and the lens storage state, and
    the mirror is configured to form an optical path optically connecting the first lens group and the third lens group in the first shooting state, not to obstruct an optical path optically connecting the prism, the second lens group and the third lens group in the second shooting state, and to secure a storage space for the first lens group in the lens storage state.
  2. The imaging lens assembly according to claim 1, wherein
    the mirror is configured to form an optical path optically connecting the first lens group and the third lens group, by tilting with respect to both of an optical axis direction of the first lens group and an optical axis direction of the third lens group,
    the mirror is configured not to obstruct an optical path optically connecting the prism, the second lens group and the third lens group, by maintaining a state of being substantially perpendicular to the optical axis direction of the first lens group, and
    the mirror is configured to secure a storage space for the first lens group by being substantially perpendicular to the optical axis direction of the first lens group.
  3. The imaging lens assembly according to claim 1, further configured so that:
    1 ≤ LG2 /LG1 < 2,
    where LG2 is a focal length of the second lens group and LG1 is a focal length of the first lens group.
  4. The imaging lens assembly according to claim 1, further configured so that:
    5 < (∑d1 + ∑d2) / (Yh_1 + Yh_2) < 25,
    where Σd1 is a distance on a first optical axis of the imaging lens assembly from a vertex of an object side surface of a most object side disposed lens of the first lens group to an imaging surface, the first optical axis comprising an optical axis of the first lens group and an optical axis of the third lens group which are continuous with each other at an intersection with the mirror, Σd2 is a distance on a second optical axis of the imaging lens assembly from a reflection surface of the prism to the imaging surface, the second optical axis including an optical axis of the second lens group and the optical axis of the third lens group which are linearly continuous with each other, Yh_1 is an image height of the first focal length side and Yh_2 is an image height of the second focal length side.
  5. The imaging lens assembly according to claim 1, further configured so that:
    Σd1 /f1 < 2.0,
    where Σd1 is a distance on a first optical axis of the imaging lens assembly from a vertex of an object side surface of a most object side disposed lens of the first lens group to an imaging surface, the first optical axis comprising an optical axis of the first lens group and an optical axis of the third lens group which are continuous with each other at an intersection with the mirror, and f1 is a focal length of the imaging lens assembly on the first focal length side.
  6. The imaging lens assembly according to claim 1, further configured so that:
    Σd2 /f2 < 2.0,
    where Σd2 is a distance on a second optical axis of the imaging lens assembly from a reflection surface of the prism to an imaging surface, the second optical axis including an optical axis of the second lens group and the optical axis of the third lens group which are linearly continuous with each other, and f2 is a focal length of the imaging lens assembly on the second focal length side.
  7. The imaging lens assembly according to claim 1, further configured so that:
    LG1 /f1 < 2.0,
    where LG1 is a focal length of the first lens group and f1 is a focal length of the imaging lens assembly on the first focal length side.
  8. The imaging lens assembly according to claim 1, further configured so that:
    LG1 /LG3 < 0,
    where LG1 is a focal length of the first lens group and LG3 is a focal length of the third lens group.
  9. The imaging lens assembly according to claim 1, further configured so that:
    LG2 /LG3 < 0,
    where LG2 is a focal length of the second lens group and LG3 is a focal length of the third lens group.
  10. The imaging lens assembly according to claim 1, wherein each of the first lens group and the second lens group comprises at least one lens having a positive refractive power, and the third lens group comprises at least one lens having a negative refractive power.
  11. The imaging lens assembly according to claim 1, wherein the optical axis direction of the first lens group is substantially perpendicular to optical axis directions of the second lens group and the third lens group, and
    the second lens group and the third lens group are disposed on opposite sides with respect to the mirror.
  12. The imaging lens assembly according to claim 1, wherein
    the first focal length is a short focal length,
    the second focal length is a long focal length,
    the first shooting state is a wide–angle shooting state, and
    the second shooting state is a telephoto shooting state.
  13. The imaging lens assembly according to any one of claims 1-12, wherein the first focal length is substantially equal to the second focal length.
  14. The imaging lens assembly according to any one of claims 1-13, wherein an incident direction of a light incident on the first lens group is substantially opposite to an incident direction of a light incident on the prism.
  15. The imaging lens assembly according to any one of claims 1-13, wherein an incident direction of a light incident on the first lens group is substantially equal to an incident direction of a light incident on the prism.
  16. The imaging lens assembly according to any one of claims 1-15, wherein the mirror is rotatable about one end on the third lens group side of the mirror.
  17. A camera module, comprising:
    an imaging lens assembly according to any one of claims 1-16; and
    an image sensor comprising an imaging surface.
  18. The camera module according to claim 17, further comprising an IR filter disposed between the imaging lens assembly and the image sensor.
  19. An imaging device, comprising:
    a camera module according to claim 17 or 18; and
    a housing for storing the imaging lens assembly.
  20. The imaging device according to claim 19, wherein the first shooting state is a shooting state where an object on an opposite side of a display of the imaging device is shot, and
    the second shooting state is a shooting state where an object on the display side is shot.
PCT/CN2021/107170 2021-07-19 2021-07-19 Imaging lens assembly, camera module and imaging device WO2023000142A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10254055A (en) * 1997-03-10 1998-09-25 Minolta Co Ltd Multifocus camera
CN101762865A (en) * 2008-12-24 2010-06-30 大立光电股份有限公司 Imaging lens group
CN105527782A (en) * 2015-02-13 2016-04-27 福州瑞芯微电子股份有限公司 Portable electronic equipment, image shooting structure of portable electronic equipment, and method for obtaining images
CN106772908A (en) * 2017-03-31 2017-05-31 北京小米移动软件有限公司 Camera module and terminal
CN206421098U (en) * 2016-10-17 2017-08-18 陈松明 A kind of ultra-thin single sensitive chip zoom twin-lens for mobile phone
CN113132576A (en) * 2019-12-31 2021-07-16 华为技术有限公司 Camera shooting method, camera shooting module and electronic equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10254055A (en) * 1997-03-10 1998-09-25 Minolta Co Ltd Multifocus camera
CN101762865A (en) * 2008-12-24 2010-06-30 大立光电股份有限公司 Imaging lens group
CN105527782A (en) * 2015-02-13 2016-04-27 福州瑞芯微电子股份有限公司 Portable electronic equipment, image shooting structure of portable electronic equipment, and method for obtaining images
CN206421098U (en) * 2016-10-17 2017-08-18 陈松明 A kind of ultra-thin single sensitive chip zoom twin-lens for mobile phone
CN106772908A (en) * 2017-03-31 2017-05-31 北京小米移动软件有限公司 Camera module and terminal
CN113132576A (en) * 2019-12-31 2021-07-16 华为技术有限公司 Camera shooting method, camera shooting module and electronic equipment

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