WO2016060198A1 - Module de caméra et dispositif électronique - Google Patents

Module de caméra et dispositif électronique Download PDF

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Publication number
WO2016060198A1
WO2016060198A1 PCT/JP2015/079153 JP2015079153W WO2016060198A1 WO 2016060198 A1 WO2016060198 A1 WO 2016060198A1 JP 2015079153 W JP2015079153 W JP 2015079153W WO 2016060198 A1 WO2016060198 A1 WO 2016060198A1
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WO
WIPO (PCT)
Prior art keywords
camera module
light
shielding plate
light shielding
convex structure
Prior art date
Application number
PCT/JP2015/079153
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English (en)
Japanese (ja)
Inventor
朋一 梅澤
達也 藤浪
Original Assignee
富士フイルム株式会社
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 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Publication of WO2016060198A1 publication Critical patent/WO2016060198A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/118—Anti-reflection coatings having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof

Definitions

  • the present invention relates to a camera module that captures an image of a subject through a lens and an electronic device in which the camera module is incorporated.
  • the camera module includes an image sensor that images a subject and a lens unit that forms an image of the subject on the image sensor.
  • the lens unit is usually composed of a plurality of lenses.
  • a lens unit having a light shielding plate for cutting unnecessary light, a lens having a light shielding material with low glossiness for reducing reflected light while cutting unnecessary light, and the like have been proposed.
  • Japanese Patent Application Laid-Open No. 2009-048024 discloses a lens unit having a light shielding plate that is inserted between lenses and disposed at a position where unnecessary light generated by reflection on the surface of each lens does not enter other lenses. Is disclosed.
  • JP 2012-208391 A discloses a method of manufacturing an optical lens with a light shielding material having a concavo-convex shape on the lens surface in order to reduce the reflected light on the surface of the light shielding material.
  • Recent camera modules are required to achieve both a large aperture for increasing the brightness and a thin lens for miniaturization, and this requirement is expected to become more severe in the future. For this reason, the incident angle of light incident on the light shielding plate mounted on the camera module is further increased, but even in this case, a configuration that can further suppress the reflection of light on the surface of the light shielding plate is required.
  • the incident angle refers to an angle formed between the normal to the light shielding plate surface and the light incident direction.
  • the lens disclosed in Japanese Patent Application Laid-Open No. 2012-208391 has an uneven shape on the surface of the light shielding material, but the disclosed uneven shape can sufficiently reduce the reflection of light having a large incident angle. Failure to do so may cause flare and ghosting.
  • the present invention has been made in view of the above circumstances, and a thin camera module that reduces the reflection of light having a large incident angle and suppresses the occurrence of flare and ghost due to reflection on the surface of the light shielding plate, and the camera module
  • An object of the present invention is to provide an electronic device using the.
  • a camera module of the present invention includes a lens unit in which a plurality of lenses and at least one light-shielding plate are stacked in the optical axis direction of the lens, an imaging element that images a subject through the lens unit, have. At least a part of the light shielding plate is provided with an antireflection portion whose refractive index increases from the surface of the light shielding plate toward the inside of the light shielding plate, Of the surfaces of the plurality of lenses, TTL / f ⁇ 1.3 when the distance from the most object-side portion to the image sensor is TTL and the combined focal length of the lens unit is f.
  • the antireflection part preferably has a moth-eye structure.
  • the antireflection portion is formed on the rough concavo-convex structure having an average period larger than the longest wavelength ⁇ B in the wavelength band of light to be shielded, and is the most in the wavelength band of light to be shielded. And a fine concavo-convex structure having an average period of 1/2 or less of the short wavelength ⁇ A.
  • the average height of the fine concavo-convex structure is preferably 1 ⁇ 4 or less of ⁇ B.
  • the average height of the rough concavo-convex structure is preferably 1/2 or more of ⁇ B.
  • the light shielding plate has a base material made of Al, and the base material preferably has a rough uneven structure.
  • the fine uneven structure is preferably made of Ni plating.
  • the light shielding member has an antireflection structure by unevenness formed on the surface.
  • the light shielding plate is preferably included in the lens.
  • the electronic device of the present invention is equipped with the above camera module.
  • the reflection of light having a large incident angle is reduced, the occurrence of flare and ghost can be suppressed even when incorporated in a thin electronic device.
  • FIGS. As an example of the electronic apparatus of the present invention, a smartphone 10 is shown in FIGS. As illustrated in FIG. 1, the smartphone 10 includes a touch panel display input unit 11 on one side, and a predetermined instruction is given to the smartphone 10 by operating the display input unit 11 with a finger or the like. As shown in FIG. 2, a camera module 20 is provided on the other surface of the smartphone 10, and still images and moving images can be taken using the camera module 20. Still images and moving images captured by the camera module 20 can be displayed on the display input unit 11.
  • FIG. 3 is a cross-sectional view of the smartphone 10, and the optical axis Ax of the camera module 20 showing the camera module 20 mounted on the smartphone 10 coincides with the thickness direction of the smartphone 10.
  • FIG. 4 is a cross-sectional view of the camera module 20.
  • a lens unit 21, a focus driving unit 22, and an image sensor 23 are provided inside a housing 24.
  • the focus driving unit 22 drives the lens unit 21 in the direction of the optical axis Ax by an AF control unit (not shown) provided in the camera module.
  • the focus adjustment is performed by adjusting the distance to the image sensor 23.
  • the subject light entering from the opening 28 of the lens unit 21 is condensed on the image sensor 23 by the lenses 26A to 26E, and a subject image is formed.
  • the imaging element 23 converts imaging information into an electrical signal and sends the electrical signal to a control unit (not shown) of the smartphone 10.
  • FIG. 5 is an exploded perspective view of the lens unit 21.
  • the lens unit includes a cylindrical lens barrel 25, five lenses 26A to 26E, and three light shielding plates 27A to 27C.
  • the lenses 26A to 26E various lenses such as a convex lens and a concave lens can be used.
  • the curved surface of the lens may be a spherical surface or an aspherical surface.
  • the lenses 26A to 26E and the light shielding plates 27A to 27C are incorporated in the lens barrel 25, and their positions in the optical axis direction are determined by a step portion 29 provided on the inner peripheral portion of the lens barrel 25.
  • the light shielding plates 27A to 27C are collectively referred to as the light shielding plate 27.
  • the light shielding plate 27 uses Al (aluminum) as a base material 30, and a moth-eye structure having a fine uneven structure 31 made of Ni (nickel) is formed on the surface of the light shielding plate 27. 32 is formed.
  • the fine concavo-convex structure 31 is formed by arranging a plurality of conical protrusions with thin tips and thick roots.
  • the volume ratio between the material of the protrusion and the light medium occupying between adjacent protrusions gradually changes from the tip of the protrusion toward the root, so the apparent refractive index changes slowly. .
  • the light medium is air when the fine concavo-convex structure 31 is present in the atmosphere outside the lens, and is a lens material when it is present in the lens.
  • the average period of the fine concavo-convex structure 31 is smaller than 1 ⁇ 2 of the shortest wavelength ⁇ A in the wavelength band of light shielded by the light shielding plate 27.
  • the period of the fine concavo-convex structure 31 is a distance between vertices (Crest) of adjacent convex portions or a root (Root), and is a distance indicated by PS1 in FIG.
  • the average period is obtained by observing the cross-section of the fine concavo-convex structure 31 with a scanning electron microscope (SEM), measuring 10 distances between the tops of 11 adjacent concavo-convex parts or the valley bottoms, and calculating the average value. Can be obtained by calculating.
  • SEM scanning electron microscope
  • the wavelength band of light to be shielded is a region of 360 nm to 830 nm (visible light region) if the camera module 20 is a normal camera module, and a region of 700 nm to 2500 nm if it is an infrared camera module. It is.
  • the antireflection part 32 is provided at least at a part of the part where the light is incident while being incorporated in the lens barrel 25, but may be provided at the whole part where the light is incident, or the entire surface of the light shielding plate 27. May be provided.
  • the antireflection part 32 has an increased refractive index from the surface toward the inside, and can reduce light reflection on the surface of the antireflection part 32. It is possible to prevent the light reflected on the surface of the antireflection part 32 from entering the image sensor 23 and reduce the occurrence of ghosts and flares.
  • the fine concavo-convex structure 31 is formed by plating (plating) Ni (nickel) on an Al (aluminum) base material 30.
  • a nickel plating process for forming the fine concavo-convex structure 31 for example, a black plating technique of Ebina Denka Kogyo is used (see http://www.ebinadk.com/technology/tech/detail02.html).
  • the fine concavo-convex structure 31 is formed by applying an energy curable resin on a base material, embossing the applied energy curable resin with a mold on which a fine concavo-convex structure is formed, and then irradiating ultraviolet rays or the like.
  • the energy curable resin may be cured by heating or curing.
  • the operation of the light shielding plate 27 of the present embodiment will be described with reference to FIG. Since the operation of each of the light shielding plates 27A to 27C is basically the same, the light shielding plate 27C will be described as an example, and the description of the light shielding plates 27A and 27B will be omitted. As described above, since the antireflection portion 32 of the light shielding plate 27C has the fine concavo-convex structure 31, since the refractive index gradually increases from the surface toward the inside, the reflected light on the surface of the antireflection portion 32 is reduced. be able to.
  • a light beam having a large incident angle ⁇ formed by the normal V of the light shielding plate 27C and the light beam L incident on the light shielding plate 27C also enters the light shielding plate 27C. It becomes like this.
  • the distance from the most object-side portion of the surface of the lens 26A to the image sensor 23 is TTL (mm) and the combined focal length f (mm) of the lenses 26A to 26E.
  • TTL / f ⁇ 1.3 the tendency becomes remarkable.
  • FIG. 12 shows a light shielding plate 40 in which a concavo-convex structure 41 larger than the wavelength of the light band to be shielded on the surface is formed on a base material 42.
  • a light beam having a small incident angle is incident on the light shielding plate 40, the light is scattered by the action of the concavo-convex structure 41, and unnecessary light incident on the image sensor can be reduced.
  • the light shielding plate 40 appears to shine white when observed with the naked eye, and the unnecessary light cannot be sufficiently reduced.
  • the unnecessary light refers to harmful light that is generated by reflection from the lens surface or the like and causes flare or ghost.
  • FIG. 13 shows a light shielding plate 50 having an antireflection film 51 using interference of light on a base material 52.
  • ⁇ 1 is an incident angle formed by the normal line V1 of the light shielding plate 50 and the light ray L1 incident on the light shielding plate 50.
  • the change in the antireflection effect due to the incident angle is small, and the reflection of light on the surface of the antireflection part 32 is reduced. Therefore, it is suitable as a method for preventing reflection of a light shielding plate used in a thin camera module in recent years.
  • the light shielding plate 27 having the fine concavo-convex structure 31 on the surface is used, but a light shielding plate having a plurality of layers on the base material can also be used.
  • a base material 62 is provided with an antireflection portion 61 including a black paint layer 63 and an antireflection layer 64.
  • the black paint layer 63 is provided by applying GT20 manufactured by Canon Kasei Co., Ltd. to the base material 62 and then drying it.
  • the antireflection layer 64 is an Al 2 O 3 layer provided by a vacuum deposition method. J, A.M.
  • the refractive index of the black paint layer 63 was 1.7 when the wavelength was 546 nm
  • the refractive index of the antireflection layer 64 was 1. when the wavelength was 546 nm. 4.
  • a light shielding plate having a rough concavo-convex structure and a fine concavo-convex structure may be used.
  • the light shielding plate 70 shown in FIG. 9 is formed on a base material 72 having a rough concavo-convex structure 74 having an average period longer than the longest wavelength in the wavelength band of light to be shielded, and the rough concavo-convex structure 74.
  • an antireflection portion 71 having a fine concavo-convex structure 73.
  • the base material 72 is made of Al (aluminum), and the rough concavo-convex structure 74 is formed by subjecting the base material 72 to nitric acid electrolysis.
  • the fine uneven structure 73 is formed by Ni plating.
  • the rough concavo-convex structure 74 may be formed by sandblasting.
  • the fine concavo-convex structure 73 is formed by applying an energy curable resin on the base material, pressing the energy curable resin applied using a mold in which a fine concavo-convex structure is formed, and then irradiating ultraviolet rays or the like. It may be formed by heating or curing the energy curable resin.
  • the rough concavo-convex structure 74 has an average period larger than the longest wavelength ⁇ B in the wavelength band of light that the light shielding plate 70 shields.
  • the period is a distance between vertices of adjacent convex portions of the rough concavo-convex structure 74, and is a distance indicated by PL in FIG.
  • the wavelength band of light to be shielded is a region of 360 nm to 830 nm (visible light region) if the camera module 20 is a normal camera module, and a region of 700 nm to 2500 nm if it is an infrared camera module. It is.
  • the average height of the rough concavo-convex structure 74 is 1 ⁇ 2 or more of the above ⁇ B.
  • the height of the rough concavo-convex structure is the height indicated by HL in FIG. 9, and the average height is a cross-section of the rough concavo-convex structure 74 observed by a scanning electron microscope (SEM: Scanning Electron Microscope). Then, it can be obtained by measuring the heights of the vertices (Crest) of the ten adjacent irregularities and calculating the average value thereof.
  • the fine concavo-convex structure 73 is difficult to peel off from the base material 72 and light reflection on the surface of the antireflection portion 71 is further reduced. be able to.
  • the fine concavo-convex structure 73 is a moth-eye structure formed by Ni plating, and the average period of the fine concavo-convex structure 73 is smaller than 1 ⁇ 2 of the shortest wavelength ⁇ A in the wavelength band of light shielded by the light shielding plate 70. It has become.
  • the wavelength band of light to be shielded is a visible light region of 360 nm or more and 830 nm or less if the camera module 20 is a normal camera, and a region of 700 nm or more and 2500 nm or less if the camera module 20 is an infrared camera.
  • the period of the fine concavo-convex structure 73 is the distance between adjacent convex portions of the fine concavo-convex structure 73, that is, the distance indicated by PS2 in FIG. 9, and the average period is the cross section of the fine concavo-convex structure 73 taken by a scanning electron microscope. It can be obtained by observing with (SEM: Scanning ⁇ ⁇ Electron Microscope), measuring 10 distances between the vertices (Crest) of the 11 adjacent projections and depressions, or the root (Root), and calculating the average value. .
  • the average height of the fine concavo-convex structure 73 is 1 ⁇ 2 or more of the above ⁇ B.
  • the height of the fine concavo-convex structure 73 is the height indicated by HS in FIG. 9, and the average height is obtained by observing a cross section of the fine concavo-convex structure 31 with a scanning electron microscope (SEM). It can be obtained by measuring the heights of the tops (Crest) of 10 adjacent irregularities and calculating the average value thereof.
  • SEM scanning electron microscope
  • the fine concavo-convex structure 73 has the concavo-convex size as described above, the reflection of light on the surface of the antireflection portion 71 can be further reduced.
  • a lens 80 shown in FIG. 10 includes a light shielding plate 81. Further, the light shielding plate 81 has an antireflection portion (not shown), and the antireflection portion is provided with a fine uneven structure and a rough uneven structure (not shown).
  • the light shielding plate 81 is temporarily assembled on the first preform 82 made of a transparent resin, and is put into the mold unit 90 (A).
  • the second preform 83 made of a transparent resin is put into the mold unit 90 and disposed so as to overlap the first preform 82 (B).
  • the first mold 91 and the second mold 92 are heated by a heater (not shown), and the first preform 82 and the second preform 83 are heated to the glass transition temperature Tg.
  • the first preform 82 and the second preform 83 are compression molded by the first mold 91 and the second mold 92 (C). After the compression molding, the first preform 82 and the second preform 83 are cooled while maintaining the pressure. The molded shape is fixed by cooling while maintaining the compression state. The first preform 82 is integrated with the second preform 83 in a state where the light shielding plate 81 is sandwiched between the first preform 82 and the second preform 83. After compression molding, the molded lens 80 is taken out from the mold unit 90 (D).
  • the light shielding plate 81 is included in the lens 80, a fine concavo-convex structure that is easily damaged is not exposed on the surface, and the handling becomes easy.
  • the lens 80 including the light shielding plate 81 is illustrated as an alternative to the lens 26A and the light shielding plate 27A.
  • the light shielding plate can be included in an arbitrary lens.
  • the lens 26E includes the light shielding plate.
  • 27C may be included.
  • a transparent resin is used as the lens preform.
  • the present invention is not limited to this.
  • glass or a resin that transmits infrared rays and does not transmit visible light may be used. .
  • the antireflection part is provided on a part of the light shielding plate, but the present invention is not limited to this, and the antireflection part is provided on the entire surface of the light shielding plate. May be.
  • the smartphone 10 is exemplified as the electronic device, but the present invention is not limited to this, and any electronic device using a camera module may be used. In particular, it is suitable for a portable electronic device that requires a thin camera module, such as a smartphone 10, a tablet terminal, a glasses-type wearable terminal, and a wristwatch-type wearable terminal.
  • the present invention is not limited to the above-described embodiments, and various configurations can be adopted without departing from the gist of the present invention.
  • the above-described various embodiments and various modifications can be appropriately combined.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Lens Barrels (AREA)
  • Surface Treatment Of Optical Elements (AREA)
  • Camera Bodies And Camera Details Or Accessories (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Studio Devices (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

L'invention concerne : un module de caméra mince avec lequel les images fantômes et la lumière parasite sont réduites ; et un dispositif électronique équipé dudit module de caméra. Le module de caméra est pourvu de lentilles et de plaques de protection contre la lumière. Des parties antireflet sont présentes sur les plaques de protection contre la lumière. Les parties antireflet ont chacune un indice de réfraction qui augmente de la surface vers l'intérieur. Dans les plaques de protection contre la lumière, on utilise l'aluminium (Al) comme matériau de base. Des structures en œil de papillon qui ont chacune une structure fine irrégulière comprenant du nickel (Ni) sont formées sur les surfaces des plaques de protection contre la lumière pour former les parties antireflet.
PCT/JP2015/079153 2014-10-16 2015-10-15 Module de caméra et dispositif électronique WO2016060198A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014212025A JP6430206B2 (ja) 2014-10-16 2014-10-16 カメラモジュール
JP2014-212025 2014-10-16

Publications (1)

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WO2016060198A1 true WO2016060198A1 (fr) 2016-04-21

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WO (1) WO2016060198A1 (fr)

Cited By (3)

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KR20220019812A (ko) 2019-07-19 2022-02-17 도판 인사츠 가부시키가이샤 차광판, 카메라 유닛, 및, 전자 기기
KR20220108168A (ko) 2020-01-20 2022-08-02 도판 인사츠 가부시키가이샤 차광판, 카메라 유닛, 전자 기기, 및 차광판의 제조 방법
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JP6814170B2 (ja) * 2018-03-06 2021-01-13 株式会社きもと 光学機器用積層遮光フィルム、並びに、これを用いた光学機器用遮光リング、レンズユニット及びカメラモジュール
US11910078B2 (en) 2019-08-30 2024-02-20 Samsung Electro-Mechanics Co., Ltd. Camera module
WO2021101175A1 (fr) * 2019-11-20 2021-05-27 Samsung Electronics Co., Ltd. Dispositif électronique comprenant un module de caméra

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US12015838B2 (en) 2019-07-19 2024-06-18 Toppan Inc. Light shielding plate, camera unit, and electronic device
US12047664B2 (en) 2019-07-19 2024-07-23 Toppan Inc. Light shielding plate, camera unit, electronic device, and method of producing the light shielding plate
KR20220108168A (ko) 2020-01-20 2022-08-02 도판 인사츠 가부시키가이샤 차광판, 카메라 유닛, 전자 기기, 및 차광판의 제조 방법
US12041332B2 (en) 2020-01-20 2024-07-16 Toppan Inc. Light shielding plate, camera unit, electronic device, and method of manufacturing light shielding plate

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