WO2024089911A1 - Unité de lentille pour inspection de trou - Google Patents

Unité de lentille pour inspection de trou Download PDF

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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
English (en)
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/fr

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    • 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.

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  • 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)
  • Instruments For Viewing The Inside Of Hollow Bodies (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne une unité de lentille pour inspection de trou comprenant : un tube externe cylindrique ; un tube interne cylindrique qui est introduit dans le tube externe ; une lentille d'objectif disposée à l'intérieur d'une extrémité distale du tube interne ; une unité de monture qui supporte une partie extrémité proximale du tube externe et une partie extrémité proximale du tube interne, et sur laquelle est montée une caméra pour imager l'intérieur d'un trou à travers la lentille d'objectif ; un tube de guidage de lumière cylindrique disposé entre le tube externe et le tube interne de façon à être entouré par une partie extrémité distale du tube externe, et de façon à entourer la partie extrémité distale du tube interne ; et une pluralité de diodes électroluminescentes en forme d'ogive disposées à l'intérieur du tube externe et autour du tube interne, chaque diode de la pluralité de diodes électroluminescentes en forme d'ogive faisant face à une partie extrémité sur le côté unité de monture du tube de guidage de lumière.
PCT/JP2023/013902 2022-10-25 2023-04-04 Unité de lentille pour inspection de trou WO2024089911A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022170947A JP7392804B1 (ja) 2022-10-25 2022-10-25 穴検査用レンズユニット
JP2022-170947 2022-10-25

Publications (1)

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

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Application Number Title Priority Date Filing Date
PCT/JP2023/013902 WO2024089911A1 (fr) 2022-10-25 2023-04-04 Unité de lentille pour inspection de trou

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JP (1) JP7392804B1 (fr)
WO (1) WO2024089911A1 (fr)

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 (zh) * 2019-12-20 2020-02-21 苏州聚悦信息科技有限公司 点阵红外光成像技术的线路板孔缺陷检测装置及其方法
JP2022014226A (ja) * 2020-07-06 2022-01-19 株式会社東京精密 ワーク検査方法及び装置並びにワーク加工方法

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 (zh) * 2019-12-20 2020-02-21 苏州聚悦信息科技有限公司 点阵红外光成像技术的线路板孔缺陷检测装置及其方法
JP2022014226A (ja) * 2020-07-06 2022-01-19 株式会社東京精密 ワーク検査方法及び装置並びにワーク加工方法

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

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