WO1993013406A1 - Appareil et procede permettant de distinguer des defauts dans un support d'enregistrement optique - Google Patents

Appareil et procede permettant de distinguer des defauts dans un support d'enregistrement optique Download PDF

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Publication number
WO1993013406A1
WO1993013406A1 PCT/JP1989/001168 JP8901168W WO9313406A1 WO 1993013406 A1 WO1993013406 A1 WO 1993013406A1 JP 8901168 W JP8901168 W JP 8901168W WO 9313406 A1 WO9313406 A1 WO 9313406A1
Authority
WO
WIPO (PCT)
Prior art keywords
recording medium
optical recording
optical
light
defects
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP1989/001168
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English (en)
Japanese (ja)
Inventor
Taro Sato
Shigeru Izawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Anticipated expiration legal-status Critical
Publication of WO1993013406A1 publication Critical patent/WO1993013406A1/fr
Ceased legal-status Critical Current

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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

Definitions

  • the present invention relates to an optical recording medium defect identification apparatus and method for easily identifying defects on an optical recording medium such as an optical memory card.
  • An optical recording medium such as an optical memory card or an optical disk forms an optical change pattern such as a light and dark bit in a few micron units on the recording surface. Digital data is being recorded.
  • an optical recording medium if there is a defect such as dirt or a scratch on the surface, data cannot be written or read accurately. Therefore, when writing or reading data, it is necessary to check whether there is a defect as described above.
  • optical recording medium defects are identified by a method such as inspecting the surface with a microscope.
  • the present invention solves the above-mentioned conventional problems and provides a surface of an optical recording medium. It is an object of the present invention to provide an optical recording medium identification device and a method for extremely easily identifying defects such as dirt and scratches adhered to a recording medium.
  • a defect identifying apparatus for an optical recording medium comprises: an arrangement table on which an optical recording medium is arranged; a television camera for photographing the surface of the optical recording medium; A receiver for receiving an image of a television force camera, and a light source for dark-field illumination for irradiating a light beam at a predetermined angle to the surface of the optical recording medium.
  • a case in which a case in which light from outside is blocked is provided, and a placement table for placing an optical recording medium on the bottom in the case is provided on the ceiling in the case.
  • the telephoto camera which shoots the surface of the optical recording medium from above, placed on the surface of the optical recording medium, shines a light beam on the wall inside the case at a predetermined angle to the surface of the optical recording medium. It is characterized by providing a light source for illumination and receiving an image of a television camera by a receiver.
  • the method for identifying defects in an optical recording medium is directed to an optical recording medium provided with a transparent protective film on a recording surface on which data is recorded by forming an optical change pattern.
  • the surface of the protective film is irradiated with light at a predetermined inclination angle, and the surface of the protective film is photographed with a television camera to identify a defect on the protective surface. And are characterized.
  • the optical recording medium is an optical memory. It is characterized by being a card.
  • the television camera is not affected by the light reflected from the surface of the protective film, and the dirt on the optical recording medium is not affected. Since only defects such as scratches and scratches are displayed, the defects can be identified very easily.
  • FIG. 1 is a schematic configuration diagram of an optical recording medium defect identification apparatus according to an embodiment of the present invention.
  • Fig. 2 shows the optical memory card projected on a receiver.
  • Fig. 3 is a cross-sectional view showing the structure of the optical memory card
  • Fig. 4 (a) shows the path of light when the optical memory card is irradiated with light obliquely.
  • Fig. 4 (b) is a diagram showing the path of light when the light is irradiated on the optical memory card from the vertical direction.
  • FIG. 1 is a schematic configuration diagram showing one embodiment of a defect identification device using a defect identification method for an optical recording medium according to the present invention. In this embodiment, a case will be described in which a defect of an optical memory card is identified as an optical recording medium.
  • the defect identification device includes an arrangement table 2 for disposing an optical memory card 10 provided in a case 1, and a television camera camera. 3 and a receiver 6 connected to the light source 5 and the television camera 3.
  • the optical memory card 10 for identification is provided with a recording film 16 for optically writing data on a substrate 15 as shown in FIG.
  • a transparent protective film 17 is coated on the surface.
  • This light 10 memory card 10 is placed on the placement table 2 with its surface facing upward.
  • the television camera 3 is arranged so as to face the optical memory card 10 and photographs the surface of the protective film 17 of the optical memory card 10.
  • the image of the protective film 17 of the light 10 memory card 10 taken by the television camera 3 is enlarged. It is being projected.
  • the light source 5 is provided for dark-field illumination, and irradiates light at a certain angle 0 to the surface of the protective film 17 of the light memory card 10 as shown in the figure. It is positioned as follows.
  • the angle 0 is an angle at which a dark field can be obtained by the light source 5.
  • the optical memory card 10 is set on the mounting table 2, and the light source 5 irradiates the surface of the protective film 17 with light. Use 3 to capture the surface of the optical memory card 10 Shadows. As a result, the entire surface of the protective film 17 appears dark on the image receiver 6, and only the defects 12 such as dirt and scratches on the surface shine and appear.
  • FIG. 2 shows a state in which the defect 12 is displayed on the receiver 6. Thus, the defect 12 of the optical memory card 10 can be easily identified.
  • the light scattered by the defect 12 on the protective film 17 travels in the vertical direction while being separated from the reflected light from the surface of the recording film 16. Therefore, for observations from the vertical direction, only the diffuse light from the defect 12 is identified. Therefore, the effect shown in the above embodiment can be obtained.
  • the identification of defects of the optical memory card 10 has been described. However, it is needless to say that the present invention can be applied to the identification of optical disk defects. Nor .

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

Appareil permettant de distinguer des défauts sur la surface d'un support d'enregistrement optique tel qu'une carte de mémoire optique, et procédé utilisé à cet effet. Selon ce procédé servant à distinguer des défauts dans le support d'enregistrement optique, de la lumière est projetée à un angle incliné prédéterminé sur la surface d'une couche protectrice transparente formée sur la surface du support sur laquelle le motif des variations optiques est produit pour enregistrer des données, et la surface de la couche protectrice est filmée par une caméra de télévision afin de distinguer n'importe quel défaut sur la couche protectrice. L'appareil utilisé avec ce procédé comprend une plaque sur laquelle est placé le support d'enregistrement optique, une caméra de télévision permettant de filmer la surface du support, un dispositif à tube cathodique recevant l'image obtenue par la caméra, et une source de lumière, destinée à une illumination à fond noir, qui projette le rayon de lumière sur la surface du support d'enregistrement à un angle prédéterminé. La caméra de télévision enregistre seulement les défauts tels que des taches et des rayures adhérant au support d'enregistrement sans être affectés par la lumière réfléchie à partir de la surface de la couche protectrice, de sorte que les défauts peuvent être aisément distingués.
PCT/JP1989/001168 1988-11-18 1989-11-16 Appareil et procede permettant de distinguer des defauts dans un support d'enregistrement optique Ceased WO1993013406A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP29164288 1988-11-18
JP63/291642 1988-11-18
JP63/323013 1988-12-21
JP32301388A JPH02223021A (ja) 1988-11-18 1988-12-21 光記録媒体の欠陥識別方法及びその装置

Publications (1)

Publication Number Publication Date
WO1993013406A1 true WO1993013406A1 (fr) 1993-07-08

Family

ID=26558633

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1989/001168 Ceased WO1993013406A1 (fr) 1988-11-18 1989-11-16 Appareil et procede permettant de distinguer des defauts dans un support d'enregistrement optique

Country Status (2)

Country Link
JP (1) JPH02223021A (fr)
WO (1) WO1993013406A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0816833A3 (fr) * 1996-06-28 1998-08-26 Fujifilm Electronic Imaging Limited Dispositif et procédé d'illumination

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5719647A (en) * 1980-07-11 1982-02-01 Hitachi Ltd Inspecting device for sample of face plate
JPS59135353A (ja) * 1983-01-24 1984-08-03 Toshiba Corp 表面傷検出装置
JPS6232345A (ja) * 1985-08-02 1987-02-12 Yaskawa Electric Mfg Co Ltd 欠点検出装置
JPS63218847A (ja) * 1987-03-09 1988-09-12 Nok Corp 表面欠陥検査方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5719647A (en) * 1980-07-11 1982-02-01 Hitachi Ltd Inspecting device for sample of face plate
JPS59135353A (ja) * 1983-01-24 1984-08-03 Toshiba Corp 表面傷検出装置
JPS6232345A (ja) * 1985-08-02 1987-02-12 Yaskawa Electric Mfg Co Ltd 欠点検出装置
JPS63218847A (ja) * 1987-03-09 1988-09-12 Nok Corp 表面欠陥検査方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0816833A3 (fr) * 1996-06-28 1998-08-26 Fujifilm Electronic Imaging Limited Dispositif et procédé d'illumination
US6091834A (en) * 1996-06-28 2000-07-18 Fujifilm Electronic Imaging, Limited Method of illuminating a digital representation of an image

Also Published As

Publication number Publication date
JPH02223021A (ja) 1990-09-05

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