GB1479657A - Examination of sheet material - Google Patents

Examination of sheet material

Info

Publication number
GB1479657A
GB1479657A GB1608374A GB1608374A GB1479657A GB 1479657 A GB1479657 A GB 1479657A GB 1608374 A GB1608374 A GB 1608374A GB 1608374 A GB1608374 A GB 1608374A GB 1479657 A GB1479657 A GB 1479657A
Authority
GB
United Kingdom
Prior art keywords
radiation
mirror
curved
lens
sheet material
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.)
Expired
Application number
GB1608374A
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.)
Novartis AG
Original Assignee
Ciba Geigy AG
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 Ciba Geigy AG filed Critical Ciba Geigy AG
Priority to GB1608374A priority Critical patent/GB1479657A/en
Publication of GB1479657A publication Critical patent/GB1479657A/en
Expired legal-status Critical Current

Links

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
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8901—Optical details; Scanning details

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • 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)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

1479657 Examining sheet material CIBAGEIGY AG 27 March 1975 11 April 1974] 16083/74 Heading G1A [Also in Division G2] The invention relates to a method of and apparatus for examining sheet material 3. The method comprises reflecting radiation from a point source from the sheet material 3 on to a curved mirror 6 via a positive curved cylindrical lens 5, the radiation then passing from the curved mirror 6 to a photo-electric cell 7 e.g. a photo-multiplier. The radiation may be visible light, infrared radiation or a laser beam. The radiation falls in a line transversely of the material 3 where the latter is supported by a preferably non-driven roller 4. The line is formed by the radiation from the point source falling on a rotating mirror polygon 1 and thence on a mirror 2 by which it is deflected. The lens 5 which may be of polystyrene or polymethylmethacrylate has its longitudinal axis substantially parallel to the aforesaid line, the lens being either permanently curved or being held in a curved condition. The mirror 6 has a radius of curvature equal to the total length of the optical path of radiation from the point of deflection to the mirror and the focal length of the lens 5 is less than half the distance between the line on the web intercepted by the radiation and the curved mirror.
GB1608374A 1975-03-27 1975-03-27 Examination of sheet material Expired GB1479657A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1608374A GB1479657A (en) 1975-03-27 1975-03-27 Examination of sheet material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1608374A GB1479657A (en) 1975-03-27 1975-03-27 Examination of sheet material

Publications (1)

Publication Number Publication Date
GB1479657A true GB1479657A (en) 1977-07-13

Family

ID=10070876

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1608374A Expired GB1479657A (en) 1975-03-27 1975-03-27 Examination of sheet material

Country Status (1)

Country Link
GB (1) GB1479657A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119952A (en) * 1982-03-21 1983-11-23 Konishiroku Photo Ind Optical beam scanning apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119952A (en) * 1982-03-21 1983-11-23 Konishiroku Photo Ind Optical beam scanning apparatus

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee