WO2024089911A1 - Lens unit for hole inspection - Google Patents

Lens unit for hole inspection Download PDF

Info

Publication number
WO2024089911A1
WO2024089911A1 PCT/JP2023/013902 JP2023013902W WO2024089911A1 WO 2024089911 A1 WO2024089911 A1 WO 2024089911A1 JP 2023013902 W JP2023013902 W JP 2023013902W WO 2024089911 A1 WO2024089911 A1 WO 2024089911A1
Authority
WO
WIPO (PCT)
Prior art keywords
hole
tube
inner tube
lens unit
outer tube
Prior art date
Application number
PCT/JP2023/013902
Other languages
French (fr)
Japanese (ja)
Inventor
将太郎 永田
Original Assignee
株式会社アイシン
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 株式会社アイシン filed Critical 株式会社アイシン
Publication of WO2024089911A1 publication Critical patent/WO2024089911A1/en

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/26—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes using light guides

Definitions

  • This disclosure relates to a hole inspection lens unit used to inspect the inside of a hole formed in a workpiece.
  • a hole internal inspection device that includes an inspection head and a robot that moves the inspection head a predetermined distance away from the opening of the hole in the workpiece (see, for example, Patent Document 1).
  • the inspection head of this hole internal inspection device includes a camera that captures an image of the hole in the workpiece, a wide-angle lens with an optical axis parallel to the axis of the hole in the workpiece, a relay lens composed of a combination of multiple high-precision lenses, and a half mirror that bends light from a spot light (light source) and irradiates it onto the hole.
  • the light from the spot light is bent by the half mirror and passes through the relay lens and the wide-angle lens, and is uniformly irradiated onto the internal surface of the hole.
  • the light reflected from the hole passes through the wide-angle lens, relay lens, and half mirror and is incident on the camera.
  • the camera then captures an image of the inside of the hole from a position that is a predetermined distance away from the opening of the hole to the outside of the hole.
  • the primary objective of this disclosure is to provide a lens unit for hole inspection that can ensure uniform illuminance inside a workpiece hole when imaging the inside of the hole with a camera, thereby reducing noise in the image captured by the camera.
  • the hole inspection lens unit disclosed herein is a hole inspection lens unit used for inspecting the inside of a hole formed in a workpiece, and includes a cylindrical outer tube, a cylindrical inner tube inserted into the inside of the outer tube, an objective lens disposed within the tip of the inner tube, a mount section that supports the base end of the outer tube and the base end of the inner tube and is equipped with a camera that captures images of the inside of the hole through the objective lens, a cylindrical light guide tube that is surrounded by the tip of the outer tube and is disposed between the outer tube and the inner tube so as to surround the tip of the inner tube, and a plurality of shell-shaped light-emitting diodes that are disposed within the outer tube and around the inner tube so as to face the ends of the light guide tubes on the mount section side.
  • each bullet-shaped light-emitting diode is made to emit light.
  • the bullet-shaped light-emitting diodes have excellent light-gathering properties, and the light emitted from each bullet-shaped light-emitting diode is irradiated while being diffused into the inside of the hole via a cylindrical light guide tube. This makes it possible to ensure uniform illuminance inside the hole when imaging the inside of a hole in a workpiece with the camera, thereby reducing noise in the image captured by the camera.
  • FIG. 1 is a schematic configuration diagram showing a hole inspection system to which a hole inspection lens unit according to the present disclosure is applied;
  • FIG. 2 is a cross-sectional view showing a lens unit for hole inspection according to the present disclosure.
  • FIG. 1 is a schematic diagram showing a hole inspection system 1 to which the hole inspection lens unit (hereinafter simply referred to as the "lens unit") 20 of the present disclosure is applied.
  • the hole inspection system 1 shown in the figure is used to inspect the inside of a hole H formed in a workpiece W, such as a transmission case.
  • the hole H to be inspected may be a threaded hole, a non-threaded hole, a through hole, or a non-through hole.
  • the workpiece W is not limited to a transmission case.
  • the hole inspection system 1 includes a system control device 2, multiple robots 3, multiple robot control devices 4 each connected to the system control device 2 and controlling the corresponding robot 3, and an inspection processing device 5 connected to the system control device 2.
  • the system control device 2 includes a computer having a CPU, ROM, RAM, etc., and controls the hole inspection system 1 overall by exchanging signals (information) with the multiple robot control devices 4 and the inspection processing device 5.
  • Each robot 3 is a robot arm that can hold and move an imaging tool 10 including a lens unit 20 and a camera 30.
  • Each robot control device 4 also includes a computer having a CPU, ROM, RAM, etc., and controls the corresponding robot 3 to move the imaging tool 10 to an inspection work position a predetermined distance above the target hole H according to a predetermined control procedure.
  • the inspection processing device 5 is a computer having a CPU, ROM, RAM, etc.
  • the camera 30 of the imaging tool 10 is connected to the inspection processing device 5 via a connector, cable, etc. provided on the robot 3.
  • an inspection program is installed in the inspection processing device 5 for inspecting the internal condition of the hole H based on an image (image data) of the inside of the hole H captured by the camera 30.
  • the inspection program (software) works in cooperation with hardware such as the CPU, ROM, and RAM of the inspection processing device 5 to implement a neural network that determines (diagnoses) the quality of the internal condition of the hole H based on the image captured by the camera 30, for example.
  • FIG. 2 is a vertical cross-sectional view showing the lens unit 20.
  • the lens unit 20 includes an outer tube 21, an inner tube 22, an objective lens section 23, multiple relay lenses 24, a mount section 25 to which the camera 30 is attached, a retainer 26, a light guide tube 27, and multiple (e.g., six in this embodiment) bullet-shaped light-emitting diodes 28.
  • the outer tube 21 is cylindrically formed from a light-shielding material such as metal, and the tip of the outer tube 21 is tapered.
  • the inner tube 22 is cylindrically formed from a light-shielding material such as metal (e.g., stainless steel) with an outer diameter smaller than the inner diameter of the outer tube 21.
  • the inner tube 22 is coaxially inserted into the outer tube 21 and fixed to the base end of the outer tube 21 via a retainer 26.
  • the objective lens section 23 has a wide-angle lens 23w and is disposed (fixed) within the tip of the inner tube 22.
  • a plurality of relay lenses 24 are disposed at intervals within the inner tube 22 so as to relay an image from the wide-angle lens 23w to a camera 30 attached to a mount section 25.
  • the mount section 25 is fixed to a retainer 26, and supports the base end of the outer tube 21 and the base end of the inner tube 22 via the retainer 26.
  • a male thread 25t conforming to the C-mount standard is formed on the outer peripheral surface of the mount section 25. This makes it possible to attach various industrial cameras conforming to the C-mount standard to the mount section 25.
  • an industrial camera conforming to the CS-mount standard can also be attached to the mount section 25 via an adapter.
  • the light guide tube 27 is made of glass, quartz, or the like and is formed into a relatively short cylindrical shape, with an outer diameter slightly smaller than the inner diameter of the outer tube 21 and an inner diameter slightly larger than the outer diameter of the inner tube 22.
  • the light guide tube 27 is fitted into the tip of the outer tube 21, and the tip of the inner tube 22 is fitted inside the light guide tube 27.
  • the light guide tube 27 is surrounded by the tip of the outer tube 21 and is disposed between the outer tube 21 and the inner tube 22 so as to surround the tip of the inner tube 22.
  • the multiple bullet-shaped light-emitting diodes 28 are arranged at intervals (equally spaced) inside the outer tube 21 and around the inner tube 22 so as to face (abut) the end of the light guide tube 27 on the mount section 25 side.
  • cables (not shown) connected to each bullet-shaped light-emitting diode 28 are pulled out to the outside of the outer tube 21 through the space between the outer tube 21 and the inner tube 22, and connected to a lighting power source (not shown) via a connector.
  • each bullet-shaped light-emitting diode 28 is made to emit light.
  • the bullet-shaped light-emitting diodes 28 have excellent light-gathering properties, and the light emitted from each bullet-shaped light-emitting diode 28 is irradiated while being diffused into the inside of the hole H through the cylindrical light guide tube 27. This ensures uniform illuminance inside the hole H when the camera 30 images the inside of the hole H in the workpiece W, making it possible to extremely effectively reduce noise, such as light streaks, in the image captured by the camera 30.
  • the mount section 25 of the lens unit 20 is formed with a male screw 25t of the C-mount standard, which is a typical standard for industrial cameras. This allows many industrial cameras with different specifications such as the number of pixels to be attached to the mount section 25, so that the inside of the hole H can be imaged using a camera 30 suitable for the hole H to be imaged.
  • the objective lens section 23 of the lens unit 20 includes a wide-angle lens 23w, and multiple relay lenses 24 are arranged inside the inner tube 22. This allows the entire inside of the hole H to be focused.
  • the axial length of the lens unit 20 it is possible to determine the axial length of the lens unit 20 according to the shape of the work W, etc., and for example, the axial length of the lens unit 20 for imaging the inside of the hole H formed in the bottom of the work W can be made longer.
  • a single relay lens 24 may be arranged in the inner tube 22, or the relay lens 24 may be omitted.
  • the hole inspection lens unit of the present disclosure is a hole inspection lens unit (20) used for inspecting the inside of a hole (H) formed in a workpiece (W), and includes a cylindrical outer tube (21), a cylindrical inner tube (22) inserted into the inside of the outer tube (21), an objective lens (23, 23w) disposed within the tip of the inner tube (22), and a lens unit (23, 23w) that supports the base end of the outer tube (21) and the base end of the inner tube (22) and inspects the hole (H) via the objective lens (23, 23w).
  • the device includes a mount section (25) to which a camera (30) for capturing images of the inside of the tube is attached, a cylindrical light guide tube (27) that is surrounded by the tip of the outer tube (21) and is disposed between the outer tube (21) and the inner tube (22) so as to surround the tip of the inner tube (22), and a plurality of shell-shaped light-emitting diodes (28) that are disposed inside the outer tube (21) and around the inner tube (22) so as to face the ends of the light guide tubes (27) on the mount section (25) side.
  • each bullet-shaped light-emitting diode is made to emit light.
  • the bullet-shaped light-emitting diodes have excellent light-gathering properties, and the light emitted from each bullet-shaped light-emitting diode is irradiated while being diffused into the inside of the hole via a cylindrical light guide tube. This makes it possible to ensure uniform illuminance inside the hole when imaging the inside of a hole in a workpiece with the camera, thereby reducing noise in the image captured by the camera.
  • the mount portion (25) may also be formed with a male screw (25t) conforming to the C-mount standard.
  • the objective lens may be a wide-angle lens (23w), and at least one relay lens (24) may be disposed inside the inner tube (22).
  • the plurality of bullet-shaped light-emitting diodes (28) may each abut against the end of the light guide tube (27) on the side of the mount portion (25).
  • the disclosed invention is extremely useful for inspecting the inside of holes formed in workpieces in the manufacturing industry.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Instruments For Viewing The Inside Of Hollow Bodies (AREA)

Abstract

This lens unit for hole inspection comprises: a cylindrical outer tube; a cylindrical inner tube that is inserted into the outer tube; an objective lens disposed inside a distal end of the inner tube; a mount unit that supports a proximal end portion of the outer tube and a proximal end portion of the inner tube, and on which a camera for imaging the interior of a hole through the objective lens is mounted; a cylindrical light guide tube disposed between the outer tube and the inner tube so as to be surrounded by a distal end portion of the outer tube, and so as to surround the distal end portion of the inner tube; and a plurality of bullet-shaped light emitting diodes arranged inside the outer tube and around the inner tube, each of the plurality of bullet-shaped light emitting diodes facing an end portion on the mount unit side of the light guide tube.

Description

穴検査用レンズユニットHole inspection lens unit
　本開示は、ワークに形成された穴の内部の検査に用いられる穴検査用レンズユニットに関する。 This disclosure relates to a hole inspection lens unit used to inspect the inside of a hole formed in a workpiece.
　従来、検査ヘッドと、ワークの穴の開口部から所定距離だけ離して検査ヘッドを移動させるロボットとを含む穴内部検査装置が知られている（例えば、特許文献１参照）。この穴内部検査装置の検査ヘッドは、ワークの穴を撮像するカメラと、ワークの穴の軸線に対して平行な光軸を有する広角レンズと、複数の高精度レンズを組み合わせて構成されるリレーレンズと、スポット照明（光源）からの光を屈曲させて穴へ照射するハーフミラーとを含む。スポット照明からの光は、ハーフミラーにより屈曲されてリレーレンズと広角レンズとを透過し、穴の内部表面に均一に照射される。穴からの反射光は、広角レンズ、リレーレンズ、ハーフミラーを透過してカメラに入射される。そして、カメラは、穴の開口部から穴の外側に所定距離だけ離れた位置から穴の内部を撮像する。 Conventionally, a hole internal inspection device is known that includes an inspection head and a robot that moves the inspection head a predetermined distance away from the opening of the hole in the workpiece (see, for example, Patent Document 1). The inspection head of this hole internal inspection device includes a camera that captures an image of the hole in the workpiece, a wide-angle lens with an optical axis parallel to the axis of the hole in the workpiece, a relay lens composed of a combination of multiple high-precision lenses, and a half mirror that bends light from a spot light (light source) and irradiates it onto the hole. The light from the spot light is bent by the half mirror and passes through the relay lens and the wide-angle lens, and is uniformly irradiated onto the internal surface of the hole. The light reflected from the hole passes through the wide-angle lens, relay lens, and half mirror and is incident on the camera. The camera then captures an image of the inside of the hole from a position that is a predetermined distance away from the opening of the hole to the outside of the hole.
特開２０１８－０３６２０３号公報JP 2018-036203 A
　上述のように、カメラを穴の開口部から離間させた状態で当該穴の内部を撮像する場合、照明装置により穴の内部の全体において均一な照度を確保する必要がある。また、穴の内部における照度を確保するために、照明装置として例えば光ファイバを含む光源を用いることも考えられるが、光の直進性が強いことから、カメラにより撮像された画像に光の筋が含まれてしまう。 As mentioned above, when capturing an image of the inside of a hole with the camera spaced away from the opening of the hole, it is necessary to ensure uniform illuminance throughout the entire inside of the hole using an illumination device. To ensure illuminance inside the hole, it is possible to use a light source including, for example, optical fiber as the illumination device, but because light tends to travel in a straight line, streaks of light will appear in the image captured by the camera.
　そこで、本開示は、カメラによりワークの穴の内部を撮像する際に穴の内部で均一な照度を確保してカメラにより撮像される画像のノイズを低減化することができる穴検査用レンズユニットの提供を主目的とする。 The primary objective of this disclosure is to provide a lens unit for hole inspection that can ensure uniform illuminance inside a workpiece hole when imaging the inside of the hole with a camera, thereby reducing noise in the image captured by the camera.
　本開示の穴検査用レンズユニットは、ワークに形成された穴の内部の検査に用いられる穴検査用レンズユニットであって、筒状の外管と、前記外管の内部に挿通される筒状の内管と、前記内管の先端内に配置される対物レンズと、前記外管の基端部および前記内管の基端部を支持すると共に、前記対物レンズを介して前記穴の内部を撮像するカメラが取り付けられるマウント部と、前記外管の先端部により包囲されると共に前記内管の先端部を包囲するように前記外管と前記内管との間に配置される筒状の導光管と、それぞれ前記導光管の前記マウント部側の端部に対向するように前記外管の内部かつ前記内管の周囲に配設される複数の砲弾型発光ダイオードとを含むものである。 The hole inspection lens unit disclosed herein is a hole inspection lens unit used for inspecting the inside of a hole formed in a workpiece, and includes a cylindrical outer tube, a cylindrical inner tube inserted into the inside of the outer tube, an objective lens disposed within the tip of the inner tube, a mount section that supports the base end of the outer tube and the base end of the inner tube and is equipped with a camera that captures images of the inside of the hole through the objective lens, a cylindrical light guide tube that is surrounded by the tip of the outer tube and is disposed between the outer tube and the inner tube so as to surround the tip of the inner tube, and a plurality of shell-shaped light-emitting diodes that are disposed within the outer tube and around the inner tube so as to face the ends of the light guide tubes on the mount section side.
　本開示の穴検査用レンズユニットを用いてワークに形成された穴の内部をカメラにより撮像する際には、マウント部にカメラが取り付けられたレンズユニットを対物レンズが穴の上方に位置するように静止させる。更に、各砲弾型発光ダイオードを発光させる。砲弾型発光ダイオードは、集光性に優れるものであり、各砲弾型発光ダイオードから発せられた光は、筒状の導光管を介して穴の内部に拡散されながら照射される。これにより、カメラによりワークの穴の内部を撮像する際に穴の内部で均一な照度を確保してカメラにより撮像される画像のノイズを低減化することが可能になる。 When imaging the inside of a hole formed in a workpiece using the hole inspection lens unit of the present disclosure with a camera, the lens unit with the camera attached to the mount is stopped so that the objective lens is positioned above the hole. Furthermore, each bullet-shaped light-emitting diode is made to emit light. The bullet-shaped light-emitting diodes have excellent light-gathering properties, and the light emitted from each bullet-shaped light-emitting diode is irradiated while being diffused into the inside of the hole via a cylindrical light guide tube. This makes it possible to ensure uniform illuminance inside the hole when imaging the inside of a hole in a workpiece with the camera, thereby reducing noise in the image captured by the camera.
本開示の穴検査用レンズユニットが適用される穴検査システムを示す概略構成図である。1 is a schematic configuration diagram showing a hole inspection system to which a hole inspection lens unit according to the present disclosure is applied; 本開示の穴検査用レンズユニットを示す断面図である。FIG. 2 is a cross-sectional view showing a lens unit for hole inspection according to the present disclosure.
　次に、図面を参照しながら、本開示の発明を実施するための形態について説明する。 Next, the form for implementing the disclosed invention will be explained with reference to the drawings.
　図１は、本開示の穴検査用レンズユニット（以下、単に「レンズユニット」という。）２０が適用される穴検査システム１を示す概略構成図である。同図に示す穴検査システム１は、例えば変速機のケースといったワークＷに形成された穴Ｈの内部の検査に用いられるものである。検査対象としての穴Ｈは、ねじ穴であってもよく、非ねじ穴であってもよく、貫通穴であってもよく、非貫通穴であってもよい。また、ワークＷは、変速機のケースに限られるものではない。 FIG. 1 is a schematic diagram showing a hole inspection system 1 to which the hole inspection lens unit (hereinafter simply referred to as the "lens unit") 20 of the present disclosure is applied. The hole inspection system 1 shown in the figure is used to inspect the inside of a hole H formed in a workpiece W, such as a transmission case. The hole H to be inspected may be a threaded hole, a non-threaded hole, a through hole, or a non-through hole. Furthermore, the workpiece W is not limited to a transmission case.
　穴検査システム１は、図１に示すように、システム制御装置２と、複数のロボット３と、それぞれシステム制御装置２に接続されると共に対応するロボット３を制御する複数のロボット制御装置４と、システム制御装置２に接続される検査処理装置５とを含む。システム制御装置２は、ＣＰＵ，ＲＯＭ，ＲＡＭ等を有するコンピュータを含むものであり、複数のロボット制御装置４および検査処理装置５と信号（情報）をやり取りして穴検査システム１を統括的に制御する。各ロボット３は、それぞれレンズユニット２０およびカメラ３０を含む撮像ツール１０を保持して移動させることができるロボットアームである。また、各ロボット制御装置４は、ＣＰＵ，ＲＯＭ，ＲＡＭ等を有するコンピュータを含むものであり、予め定められた制御手順に従って、撮像ツール１０を対象となる穴Ｈの所定距離だけ上方の検査作業位置まで移動させるように対応するロボット３を制御する。 As shown in FIG. 1, the hole inspection system 1 includes a system control device 2, multiple robots 3, multiple robot control devices 4 each connected to the system control device 2 and controlling the corresponding robot 3, and an inspection processing device 5 connected to the system control device 2. The system control device 2 includes a computer having a CPU, ROM, RAM, etc., and controls the hole inspection system 1 overall by exchanging signals (information) with the multiple robot control devices 4 and the inspection processing device 5. Each robot 3 is a robot arm that can hold and move an imaging tool 10 including a lens unit 20 and a camera 30. Each robot control device 4 also includes a computer having a CPU, ROM, RAM, etc., and controls the corresponding robot 3 to move the imaging tool 10 to an inspection work position a predetermined distance above the target hole H according to a predetermined control procedure.
　検査処理装置５は、ＣＰＵ，ＲＯＭ，ＲＡＭ等を有するコンピュータである。検査処理装置５には、ロボット３に設けられたコネクタやケーブル等を介して撮像ツール１０のカメラ３０が接続される。更に、検査処理装置５には、カメラ３０により撮像された穴Ｈの内部の画像（画像データ）に基づいて当該内部の状態を検査するための検査プログラムがインストールされている。検査プログラム（ソフトウェア）は、検査処理装置５のＣＰＵやＲＯＭ、ＲＡＭといったハードウェアと協働して、例えば、カメラ３０により撮像された画像に基づいて穴Ｈの内部の状態の良否を判定（診断）するニューラルネットワークを実装するものである。 The inspection processing device 5 is a computer having a CPU, ROM, RAM, etc. The camera 30 of the imaging tool 10 is connected to the inspection processing device 5 via a connector, cable, etc. provided on the robot 3. Furthermore, an inspection program is installed in the inspection processing device 5 for inspecting the internal condition of the hole H based on an image (image data) of the inside of the hole H captured by the camera 30. The inspection program (software) works in cooperation with hardware such as the CPU, ROM, and RAM of the inspection processing device 5 to implement a neural network that determines (diagnoses) the quality of the internal condition of the hole H based on the image captured by the camera 30, for example.
　図２は、レンズユニット２０を示す縦断面図である。同図に示すように、レンズユニット２０は、外管２１と、内管２２と、対物レンズ部２３と、複数のリレーレンズ２４と、カメラ３０が取り付けられるマウント部２５と、リテーナ２６と、導光管２７と、複数（本実施形態では、例えば６個）の砲弾型発光ダイオード２８とを含む。 FIG. 2 is a vertical cross-sectional view showing the lens unit 20. As shown in the figure, the lens unit 20 includes an outer tube 21, an inner tube 22, an objective lens section 23, multiple relay lenses 24, a mount section 25 to which the camera 30 is attached, a retainer 26, a light guide tube 27, and multiple (e.g., six in this embodiment) bullet-shaped light-emitting diodes 28.
　外管２１は、金属等の遮光性を有する材料により円筒状に形成されており、当該外管２１の先端部は、先細に形成されている。内管２２は、金属（例えば、ステンレス）等の遮光性を有する材料により外管２１の内径よりも小さい外径を有する円筒状に形成されている。内管２２は、外管２１の内部に同軸に挿通されると共にリテーナ２６を介して外管２１の基端部に固定される。対物レンズ部２３は、広角レンズ２３ｗを有し、内管２２の先端内に配置（固定）される。複数のリレーレンズ２４は、マウント部２５に取り付けられたカメラ３０に広角レンズ２３ｗからの像を中継するように内管２２の内部に間隔をおいて配設される。 The outer tube 21 is cylindrically formed from a light-shielding material such as metal, and the tip of the outer tube 21 is tapered. The inner tube 22 is cylindrically formed from a light-shielding material such as metal (e.g., stainless steel) with an outer diameter smaller than the inner diameter of the outer tube 21. The inner tube 22 is coaxially inserted into the outer tube 21 and fixed to the base end of the outer tube 21 via a retainer 26. The objective lens section 23 has a wide-angle lens 23w and is disposed (fixed) within the tip of the inner tube 22. A plurality of relay lenses 24 are disposed at intervals within the inner tube 22 so as to relay an image from the wide-angle lens 23w to a camera 30 attached to a mount section 25.
　マウント部２５は、リテーナ２６に固定され、当該リテーナ２６を介して外管２１の基端部および内管２２の基端部を支持する。また、マウント部２５の外周面には、Ｃマウント規格の雄ねじ２５ｔが形成されている。これにより、マウント部２５に、Ｃマウント規格の様々な産業用カメラを取り付けることが可能となる。更に、マウント部２５には、アダプタを介してＣＳマウント規格の産業用カメラを取り付けることもできる。 The mount section 25 is fixed to a retainer 26, and supports the base end of the outer tube 21 and the base end of the inner tube 22 via the retainer 26. In addition, a male thread 25t conforming to the C-mount standard is formed on the outer peripheral surface of the mount section 25. This makes it possible to attach various industrial cameras conforming to the C-mount standard to the mount section 25. Furthermore, an industrial camera conforming to the CS-mount standard can also be attached to the mount section 25 via an adapter.
　導光管２７は、ガラスや石英等により比較的短尺の円筒状に形成されており、外管２１の内径よりも僅かに小さい外径および内管２２の外径よりも僅かに大きい内径を有する。導光管２７は、外管２１の先端部内に嵌合され、当該導光管２７の内部には、内管２２の先端部が嵌合される。これにより、導光管２７は、外管２１の先端部により包囲されると共に内管２２の先端部を包囲するように外管２１と内管２２との間に配置される。また、複数の砲弾型発光ダイオード２８は、それぞれ導光管２７のマウント部２５側の端部に対向（当接）するように外管２１の内部かつ内管２２の周囲に間隔をおいて（等間隔に）配設される。なお、各砲弾型発光ダイオード２８に接続される図示しないケーブルは、外管２１と内管２２との間の空間を介して外管２１の外部に引き出され、コネクタを介して図示しない照明用電源に接続される。 The light guide tube 27 is made of glass, quartz, or the like and is formed into a relatively short cylindrical shape, with an outer diameter slightly smaller than the inner diameter of the outer tube 21 and an inner diameter slightly larger than the outer diameter of the inner tube 22. The light guide tube 27 is fitted into the tip of the outer tube 21, and the tip of the inner tube 22 is fitted inside the light guide tube 27. As a result, the light guide tube 27 is surrounded by the tip of the outer tube 21 and is disposed between the outer tube 21 and the inner tube 22 so as to surround the tip of the inner tube 22. In addition, the multiple bullet-shaped light-emitting diodes 28 are arranged at intervals (equally spaced) inside the outer tube 21 and around the inner tube 22 so as to face (abut) the end of the light guide tube 27 on the mount section 25 side. In addition, cables (not shown) connected to each bullet-shaped light-emitting diode 28 are pulled out to the outside of the outer tube 21 through the space between the outer tube 21 and the inner tube 22, and connected to a lighting power source (not shown) via a connector.
　上述のように構成されるレンズユニット２０を用いてワークＷに形成された穴Ｈの内部をカメラ３０により撮像する際には、撮像ツール１０すなわちマウント部２５にカメラ３０が取り付けられたレンズユニット２０を対物レンズ部２３（広角レンズ２３ｗ）が穴Ｈの所定距離だけ上方に位置するようにロボット３により移動させ、検査作業位置で静止させる。更に、各砲弾型発光ダイオード２８を発光させる。砲弾型発光ダイオード２８は、集光性に優れるものであり、各砲弾型発光ダイオード２８から発せられた光は、筒状の導光管２７を介して穴Ｈの内部に拡散されながら照射される。これにより、カメラ３０によりワークＷの穴Ｈの内部を撮像する際に穴Ｈの内部で均一な照度を確保して当該カメラ３０により撮像される画像の例えば光の筋といったノイズを極めて良好に低減化することが可能になる。 When the camera 30 is used to image the inside of the hole H formed in the workpiece W using the lens unit 20 configured as described above, the imaging tool 10, i.e., the lens unit 20 with the camera 30 attached to the mount 25, is moved by the robot 3 so that the objective lens 23 (wide-angle lens 23w) is positioned a predetermined distance above the hole H, and is stopped at the inspection work position. Furthermore, each bullet-shaped light-emitting diode 28 is made to emit light. The bullet-shaped light-emitting diodes 28 have excellent light-gathering properties, and the light emitted from each bullet-shaped light-emitting diode 28 is irradiated while being diffused into the inside of the hole H through the cylindrical light guide tube 27. This ensures uniform illuminance inside the hole H when the camera 30 images the inside of the hole H in the workpiece W, making it possible to extremely effectively reduce noise, such as light streaks, in the image captured by the camera 30.
　また、レンズユニット２０のマウント部２５には、産業用カメラの代表的な規格であるＣマウント規格の雄ねじ２５ｔが形成されている。これにより、画素数等の諸元が互いに異なる多くの産業用カメラをマウント部２５に取り付けることが可能になるので、撮像対象となる穴Ｈに適したカメラ３０を用いて当該穴Ｈの内部を撮像することができる。更に、レンズユニット２０の対物レンズ部２３は、広角レンズ２３ｗを含み、内管２２の内部には、複数のリレーレンズ２４が配置される。これにより、穴Ｈの内部の全体に焦点を合わせることができる。また、内管２２の内部に複数のリレーレンズ２４を配設することで、ワークＷの形状等に合わせてレンズユニット２０の軸長を定めることが可能になり、例えば、ワークＷの底部に形成された穴Ｈの内部を撮像するためのレンズユニット２０の軸長を長くすることができる。ただし、レンズユニット２０に要求される軸長によっては、内管２２内に単一のリレーレンズ２４が配置されてもよく、リレーレンズ２４が省略されてもよい。 Furthermore, the mount section 25 of the lens unit 20 is formed with a male screw 25t of the C-mount standard, which is a typical standard for industrial cameras. This allows many industrial cameras with different specifications such as the number of pixels to be attached to the mount section 25, so that the inside of the hole H can be imaged using a camera 30 suitable for the hole H to be imaged. Furthermore, the objective lens section 23 of the lens unit 20 includes a wide-angle lens 23w, and multiple relay lenses 24 are arranged inside the inner tube 22. This allows the entire inside of the hole H to be focused. Furthermore, by arranging multiple relay lenses 24 inside the inner tube 22, it is possible to determine the axial length of the lens unit 20 according to the shape of the work W, etc., and for example, the axial length of the lens unit 20 for imaging the inside of the hole H formed in the bottom of the work W can be made longer. However, depending on the axial length required for the lens unit 20, a single relay lens 24 may be arranged in the inner tube 22, or the relay lens 24 may be omitted.
　以上説明したように、本開示の穴検査用レンズユニットは、ワーク（Ｗ）に形成された穴（Ｈ）の内部の検査に用いられる穴検査用レンズユニット（２０）であって、筒状の外管（２１）と、前記外管（２１）の内部に挿通される筒状の内管（２２）と、前記内管（２２）の先端内に配置される対物レンズ（２３，２３ｗ）と、前記外管（２１）の基端部および前記内管（２２）の基端部を支持すると共に、前記対物レンズ（２３，２３ｗ）を介して前記穴（Ｈ）の内部を撮像するカメラ（３０）が取り付けられるマウント部（２５）と、前記外管（２１）の先端部により包囲されると共に前記内管（２２）の先端部を包囲するように前記外管（２１）と前記内管（２２）との間に配置される筒状の導光管（２７）と、それぞれ前記導光管（２７）の前記マウント部（２５）側の端部に対向するように前記外管（２１）の内部かつ前記内管（２２）の周囲に配設される複数の砲弾型発光ダイオード（２８）とを含むものである。 As described above, the hole inspection lens unit of the present disclosure is a hole inspection lens unit (20) used for inspecting the inside of a hole (H) formed in a workpiece (W), and includes a cylindrical outer tube (21), a cylindrical inner tube (22) inserted into the inside of the outer tube (21), an objective lens (23, 23w) disposed within the tip of the inner tube (22), and a lens unit (23, 23w) that supports the base end of the outer tube (21) and the base end of the inner tube (22) and inspects the hole (H) via the objective lens (23, 23w). The device includes a mount section (25) to which a camera (30) for capturing images of the inside of the tube is attached, a cylindrical light guide tube (27) that is surrounded by the tip of the outer tube (21) and is disposed between the outer tube (21) and the inner tube (22) so as to surround the tip of the inner tube (22), and a plurality of shell-shaped light-emitting diodes (28) that are disposed inside the outer tube (21) and around the inner tube (22) so as to face the ends of the light guide tubes (27) on the mount section (25) side.
　本開示の穴検査用レンズユニットを用いてワークに形成された穴の内部をカメラにより撮像する際には、マウント部にカメラが取り付けられたレンズユニットを対物レンズが穴の上方に位置するように静止させる。更に、各砲弾型発光ダイオードを発光させる。砲弾型発光ダイオードは、集光性に優れるものであり、各砲弾型発光ダイオードから発せられた光は、筒状の導光管を介して穴の内部に拡散されながら照射される。これにより、カメラによりワークの穴の内部を撮像する際に穴の内部で均一な照度を確保してカメラにより撮像される画像のノイズを低減化することが可能になる。 When imaging the inside of a hole formed in a workpiece using the hole inspection lens unit of the present disclosure with a camera, the lens unit with the camera attached to the mount is stopped so that the objective lens is positioned above the hole. Furthermore, each bullet-shaped light-emitting diode is made to emit light. The bullet-shaped light-emitting diodes have excellent light-gathering properties, and the light emitted from each bullet-shaped light-emitting diode is irradiated while being diffused into the inside of the hole via a cylindrical light guide tube. This makes it possible to ensure uniform illuminance inside the hole when imaging the inside of a hole in a workpiece with the camera, thereby reducing noise in the image captured by the camera.
　また、前記マウント部（２５）には、Ｃマウント規格の雄ねじ（２５ｔ）が形成されてもよい。 The mount portion (25) may also be formed with a male screw (25t) conforming to the C-mount standard.
　これにより、画素数等の諸元が互いに異なる複数のカメラをマウント部に取り付けることが可能になるので、撮像対象となる穴に適したカメラを用いて当該穴の内部を撮像することができる。 This makes it possible to attach multiple cameras with different specifications such as pixel count to the mount, so that the inside of the hole to be imaged can be captured using a camera that is suitable for the hole to be imaged.
　更に、前記対物レンズは、広角レンズ（２３ｗ）であってもよく、前記内管（２２）の内部には、少なくとも１つのリレーレンズ（２４）が配置されてもよい。 Furthermore, the objective lens may be a wide-angle lens (23w), and at least one relay lens (24) may be disposed inside the inner tube (22).
　これにより、穴の内部の全体に焦点を合わせると共に、ワークの形状等に合わせてレンズユニットの軸長を定めることが可能になる。 This makes it possible to focus on the entire inside of the hole and determine the axial length of the lens unit to suit the shape of the workpiece, etc.
　また、前記複数の砲弾型発光ダイオード（２８）は、それぞれ前記導光管（２７）の前記マウント部（２５）側の前記端部に当接してもよい。 Furthermore, the plurality of bullet-shaped light-emitting diodes (28) may each abut against the end of the light guide tube (27) on the side of the mount portion (25).
　なお、本開示の発明は上記実施形態に何ら限定されるものではなく、本開示の外延の範囲内において様々な変更をなし得ることはいうまでもない。更に、上記実施形態は、あくまで発明の概要の欄に記載された発明の具体的な一形態に過ぎず、発明の概要の欄に記載された発明の要素を限定するものではない。 It goes without saying that the invention disclosed herein is in no way limited to the above embodiment, and various modifications may be made within the scope of the present disclosure. Furthermore, the above embodiment is merely one specific form of the invention described in the Summary of the Invention section, and does not limit the elements of the invention described in the Summary of the Invention section.
　本開示の発明は、製造産業においてワークに形成された穴の内部を検査するのに極めて有用である。 The disclosed invention is extremely useful for inspecting the inside of holes formed in workpieces in the manufacturing industry.

Claims (4)

  1. 　ワークに形成された穴の内部の検査に用いられる穴検査用レンズユニットであって、
    　筒状の外管と、
    　前記外管の内部に挿通される筒状の内管と、
    　前記内管の先端内に配置される対物レンズと、
    　前記外管の基端部および前記内管の基端部を支持すると共に、前記対物レンズを介して前記穴の内部を撮像するカメラが取り付けられるマウント部と、
    　前記外管の先端部により包囲されると共に前記内管の先端部を包囲するように前記外管と前記内管との間に配置される筒状の導光管と、
    　それぞれ前記導光管の前記マウント部側の端部に対向するように前記外管の内部かつ前記内管の周囲に配設される複数の砲弾型発光ダイオードと、
    　を備える穴検査用レンズユニット。     A hole inspection lens unit used for inspecting the inside of a hole formed in a workpiece,
    A cylindrical outer tube;
    A cylindrical inner tube that is inserted into the outer tube;
    an objective lens disposed within a tip of the inner tube;
    a mount portion to which a camera is attached, the mount portion supporting a base end portion of the outer tube and a base end portion of the inner tube and configured to capture an image of the inside of the hole through the objective lens;
    a cylindrical light guide tube that is surrounded by the tip end of the outer tube and is disposed between the outer tube and the inner tube so as to surround the tip end of the inner tube;
    a plurality of shell-shaped light-emitting diodes disposed inside the outer tube and around the inner tube so as to face the end of the light guide tube on the mount portion side;
    A hole inspection lens unit comprising:
  2. 　請求項１に記載の穴検査用レンズユニットにおいて、
    　前記マウント部には、Ｃマウント規格の雄ねじが形成されている穴検査用レンズユニット。     2. The hole inspection lens unit according to claim 1,
    A hole inspection lens unit in which a male screw conforming to the C-mount standard is formed on the mount portion.
  3. 　請求項１に記載の穴検査用レンズユニットにおいて、
    　前記対物レンズは、広角レンズであり、前記内管の内部には、少なくとも１つのリレーレンズが配置される穴検査用レンズユニット。     2. The hole inspection lens unit according to claim 1,
    The objective lens is a wide-angle lens, and at least one relay lens is disposed inside the inner tube.
  4. 　請求項１から３の何れか一項に記載の穴検査用レンズユニットにおいて、
    　前記複数の砲弾型発光ダイオードは、それぞれ前記導光管の前記マウント部側の前記端部に当接する穴検査用レンズユニット。     The hole inspection lens unit according to any one of claims 1 to 3,
    The plurality of bullet-shaped light-emitting diodes each constitute a hole inspection lens unit that abuts against the end of the light guide tube on the mount portion side.
PCT/JP2023/013902 2022-10-25 2023-04-04 Lens unit for hole inspection WO2024089911A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-170947 2022-10-25
JP2022170947A JP7392804B1 (en) 2022-10-25 2022-10-25 Lens unit for hole inspection

Publications (1)

Publication Number Publication Date
WO2024089911A1 true WO2024089911A1 (en) 2024-05-02

Family

ID=89023329

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/013902 WO2024089911A1 (en) 2022-10-25 2023-04-04 Lens unit for hole inspection

Country Status (2)

Country Link
JP (1) JP7392804B1 (en)
WO (1) WO2024089911A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120314213A1 (en) * 2010-03-19 2012-12-13 Khs Gmbh Cover view gripper
CN110823924A (en) * 2019-12-20 2020-02-21 苏州聚悦信息科技有限公司 Circuit board hole defect detection device and method of dot matrix infrared light imaging technology
JP2022014226A (en) * 2020-07-06 2022-01-19 株式会社東京精密 Workpiece inspection method and device, and workpiece processing method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120314213A1 (en) * 2010-03-19 2012-12-13 Khs Gmbh Cover view gripper
CN110823924A (en) * 2019-12-20 2020-02-21 苏州聚悦信息科技有限公司 Circuit board hole defect detection device and method of dot matrix infrared light imaging technology
JP2022014226A (en) * 2020-07-06 2022-01-19 株式会社東京精密 Workpiece inspection method and device, and workpiece processing method

Also Published As

Publication number Publication date
JP2024062839A (en) 2024-05-10
JP7392804B1 (en) 2023-12-06

Similar Documents

Publication Publication Date Title
WO2010005399A2 (en) Hole inspection method and apparatus
WO2017145518A1 (en) Device and method for inspecting a processing nozzle in a laser processing machine
US20160231555A1 (en) Borescope Inspection System
JP2011089826A (en) Internal surface defect inspection apparatus of screw hole or hole
JP2009063856A (en) Dark field objective lens device
WO2024089911A1 (en) Lens unit for hole inspection
JP7086813B2 (en) Lighting equipment
JP2009162492A (en) Inspection apparatus
JPH05149885A (en) In-pipe inspection device
KR100473451B1 (en) Wire Bonding Apparatus
EP3527974B1 (en) Inspection devices and methods of inspecting a slot
JP3966405B2 (en) In-tube observation device
US6652151B2 (en) Optical connector coupling end face state confirmation scope and confirmation method thereof
EP1249299B1 (en) Nozzle system for laser machining
JP2512299B2 (en) Close-up lens with illuminator
JP4443284B2 (en) Light source holding device set
JP7240076B2 (en) Cylindrical inner surface imaging device
JP3321260B2 (en) Appearance inspection device
JP2018048981A (en) Pipe material inspection device
JP2684075B2 (en) Multi-core optical fiber connection inspection method
JPH10314968A (en) Laser beam machining device
CN115128003A (en) Optical straight rod endoscope automatic detection system for industrial pipeline inner cavity detection
JP2006039418A (en) Optical apparatus
JP2006138728A (en) Photodetector
JP2011110558A (en) Welding head of yag laser beam machine

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23882129

Country of ref document: EP

Kind code of ref document: A1