GB1254539A - Process for determining fluctuations in level in magnetizable layers - Google Patents

Process for determining fluctuations in level in magnetizable layers

Info

Publication number
GB1254539A
GB1254539A GB30381/69A GB3038169A GB1254539A GB 1254539 A GB1254539 A GB 1254539A GB 30381/69 A GB30381/69 A GB 30381/69A GB 3038169 A GB3038169 A GB 3038169A GB 1254539 A GB1254539 A GB 1254539A
Authority
GB
United Kingdom
Prior art keywords
light
level
fluctuations
plane
june
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
GB30381/69A
Inventor
Wihelm Abeck
Richard Menold
Erich Muller
Burkhard Nippe
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.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert 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 Agfa Gevaert AG filed Critical Agfa Gevaert AG
Publication of GB1254539A publication Critical patent/GB1254539A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
    • G01R33/1207—Testing individual magnetic storage devices, e.g. records carriers or digital storage elements

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

1,254,539. Photo-electric measurement of recording tape level fluctuations. AGFAGEVAERT A.G. June 16, 1969 [June 26, 1968], No. 30381/69. Heading G1A. Fluctuations in recording level of magnetic recording tape due to variations in structure of the magnetizable layer, are monitored by measuring light scattered from the surface of the layer. The layer comprises a non-metallic binder in which are dispersed magnetic particles oriented in a particular direction. The light is guided on to the surface by a vertical tube to produce a substantially parallel beam incident normal to the surface. Scattered light is measured which energizes in two separate directions, one direction being in a plane parallel to the direction of orientation of the particles and the other in a plane at right angles to this plane. The intensities may be measured separately or combined as to form a ratio. Light pipes can be used to select the two directions and guide light to photo-multipliers. The measuring apparatus is calibrated using tapes of known (including zero) level fluctuations.
GB30381/69A 1968-06-26 1969-06-16 Process for determining fluctuations in level in magnetizable layers Expired GB1254539A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681772725 DE1772725A1 (en) 1968-06-26 1968-06-26 Method for determining level fluctuations in magnetizable layers

Publications (1)

Publication Number Publication Date
GB1254539A true GB1254539A (en) 1971-11-24

Family

ID=5701370

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30381/69A Expired GB1254539A (en) 1968-06-26 1969-06-16 Process for determining fluctuations in level in magnetizable layers

Country Status (6)

Country Link
US (1) US3594582A (en)
BE (1) BE735167A (en)
DE (1) DE1772725A1 (en)
FR (1) FR2014275A1 (en)
GB (1) GB1254539A (en)
NL (1) NL6909705A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087222A2 (en) * 1982-02-19 1983-08-31 Imperial Chemical Industries Plc Surface coating characterisation method and apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60143420A (en) * 1983-12-29 1985-07-29 Fuji Photo Film Co Ltd Inspecting method of magnetic head

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2315282A (en) * 1939-10-21 1943-03-30 Harold A Snow Method of and apparatus for determining characteristics of surfaces
US3461248A (en) * 1963-06-20 1969-08-12 Richard Kane Video tape editing utilizing photoelectric means
US3500361A (en) * 1967-04-21 1970-03-10 Magnavox Co Magneto-optical correlator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087222A2 (en) * 1982-02-19 1983-08-31 Imperial Chemical Industries Plc Surface coating characterisation method and apparatus
EP0087222A3 (en) * 1982-02-19 1984-11-07 Imperial Chemical Industries Plc Surface coating characterisation method and apparatus
US4572672A (en) * 1982-02-19 1986-02-25 Imperial Chemical Industries Plc Surface coating characterization method and apparatus

Also Published As

Publication number Publication date
FR2014275A1 (en) 1970-04-17
BE735167A (en) 1969-12-29
NL6909705A (en) 1969-08-25
DE1772725A1 (en) 1971-06-03
US3594582A (en) 1971-07-20

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