公开(公告)号：DE2912708A1

公开(公告)日：1980-10-09

申请号：DE2912708

申请日：1979-03-30

Applicant: BASF AG

Inventor： FELLEISEN PETER DIPL ING ,  GROSSHANS PETER ING GRAD ,  MAYER DIETER DR

IPC: G11B5/09 ,  G11B5/012 ,  G11B21/10 ,  G11B5/48

公开(公告)号：DE2512456A1

公开(公告)日：1976-10-07

申请号：DE2512456

申请日：1975-03-21

Applicant: BASF AG

Inventor： SOMMER FRANZ ING GRAD ,  UHL KARL DIPL ING DR ,  LOESER WERNER DIPL CHEM DR ,  FELLEISEN PETER DIPL ING ,  HAMMERSCHMITT PETER DIPL ING ,  SCHNEIDER RICHARD DIPL PHYS DR

IPC: G11B5/716 ,  G11B5/68 ,  B32B15/00 ,  H01F10/00

Abstract: The disc type magnetic data record carrier consists of a carrier material (S), a magnetic film (1) for the pick-up of servo information, a non-magnetic intermediate film (Z) and a second magnetic film (2) for the pick-up of data-information. The carrier material (S) is typically provided on both sides with foils. The film strength of each magnetic film is typically 0.06 to 0.6 um and the non-magnetic film has a film strength of 10 to 30 times that of the weaker films. The ratio of the coercive force between the first and second metal magnetic films is between 0.5 and 2.0. The surface of the second magnetic film is provided with a protective film.

公开(公告)号：DE3020826A1

公开(公告)日：1981-12-10

申请号：DE3020826

申请日：1980-06-02

Applicant: BASF AG

Inventor： HACK JOACHIM DIPL ING ,  BROTZLER ROLAND DIPL ING ,  FELLEISEN PETER DIPL ING

IPC: G11B5/02 ,  G11B5/012 ,  G11B5/48 ,  G11B20/10 ,  G11B5/54

公开(公告)号：DE2713194A1

公开(公告)日：1978-10-05

申请号：DE2713194

申请日：1977-03-25

Applicant: BASF AG

Inventor： FELLEISEN PETER DIPL ING ,  GROSSHANS PETER ,  HAMMERSCHMITT PETER DIPL ING ,  SCHNEIDER RICHARD DIPL PHYS DR

IPC: G11B5/48 ,  G11B5/596 ,  G11B5/22 ,  H04N5/78

公开(公告)号：DE2451232A1

公开(公告)日：1976-05-06

申请号：DE2451232

申请日：1974-10-29

Applicant: BASF AG

Inventor： WUNSCH GERD DIPL CHEM DR ,  FEHRENBACH HUBERT ING GRAD ,  LOESER WERNER DIPL ING DR ,  HUEBNER WERNER DIPL ING ,  FELLEISEN PETER DIPL ING ,  STECK WERNER DIPL CHEM DR

IPC: G11B5/72 ,  G11B5/84 ,  H01F41/14

Abstract: In the prodn. of rigid magnetic recording supports by depositing a thin Co-contg. ferro-magnetic metal film (I) on an anodised Al disc as substrate, opt. after depositing a non-magnetic intermediate metal coating (II), and providing the surface of (I) with a thin protective coating (III), the anodised Al disc is activated by treatment with a soln. of Pd(O) complex in an organic solvent and the complex is decomposed, pref. by heating, then (I) is deposited by electroless and then opt. electro-plating. Activation eliminates the need for (II) and discs with very good electromagnetic and the mechanical properties in use and good corrosion resistance are obtd. (I) is deposited directly on the activated surface. The metal-coatd disc is tempered under an inert gas at 150-300 degrees C. (III) is applied using a soln. of a film-forming organic lacquer binder in a volatile solvent to give a dry unbaked film thickness of max. 0.3 mu m, then the coating is dried and baked in an O2-contg. atmos. for 1-15 h at 200-300 degrees C.

公开(公告)号：DE2228643A1

公开(公告)日：1974-01-10

申请号：DE2228643

申请日：1972-06-13

Applicant: BASF AG

Inventor： HARTMANN WERNER JOB DR ,  HARTMANN HANS-JOERG DR ,  MAYER DIETER DR ,  FELLEISEN PETER DIPL ING ,  KLEIN URSULA ,  MOTZ HERBERT DR

IPC: G11B5/62 ,  G11B5/708 ,  G11B5/72

公开(公告)号：DE3238077A1

公开(公告)日：1984-04-19

申请号：DE3238077

申请日：1982-10-14

Applicant: BASF AG

Inventor： FELLEISEN PETER DIPL ING ,  KRUG ARIBERT ING GRAD ,  GROSSHANS PETER ING GRAD

IPC: G01R33/12 ,  G11B5/00 ,  G11B5/09 ,  G11B5/84 ,  G11B20/10 ,  G11B20/18

Abstract: A method and circuit arrangements for detecting and evaluating dropouts or drop-ins on recording media, comprising reading and modifying the recorded digital signals, the size and type of fault being evaluated on the basis of fixed threshold levels. In the case of a dropout, for example, the fault is weighted by determining the differential of the envelope of the read signal. In the case of a drop-in, other noise signals are left out of consideration by nonlinear emphasis of the drop-in and appropriate choice of the threshold value. A circuit combination enables both dropouts and drop-ins to be detected and evaluated.

公开(公告)号：DE3213508A1

公开(公告)日：1983-10-20

申请号：DE3213508

申请日：1982-04-10

Applicant: BASF AG

Inventor： SCHAEFER DIETER DIPL CHEM DR ,  FELLEISEN PETER DIPL ING ,  DOMAS FRIEDRICH DIPL ING ,  MAYER DIETER DR

IPC: G11B5/842 ,  G11B5/84 ,  G11B5/845 ,  G11B5/68 ,  H01F41/16

公开(公告)号：DE2928096A1

公开(公告)日：1981-02-05

申请号：DE2928096

申请日：1979-07-12

Applicant: BASF AG

Inventor： FELLEISEN PETER DIPL ING ,  MAYER DIETER DR ,  KOESTER EBERHARD DIPL PHYS DR ,  DOMAS FRIEDRICH DIPL ING ,  DEIGNER PAUL DIPL CHEM DR

IPC: C09D5/23 ,  G11B5/70 ,  G11B5/716 ,  G11B5/718 ,  G11B5/84 ,  G11B5/842 ,  G11B5/68 ,  H01F10/00 ,  B05D5/12

Abstract: A magnetic recording disk comprising a non-magnetic substrate and two or more firmly adhering magnetizable layers applied to one or both sides thereof, the layer located directly on the substrate being magnetically isotropic, while the second layer and any additional layers exhibit orientation of the anisotropic magnetic particles parallel to the substrate and to the envisaged recording direction.

公开(公告)号：DE2459541A1

公开(公告)日：1976-07-01

申请号：DE2459541

申请日：1974-12-17

Applicant: BASF AG

Inventor： KOESTER EBERHARD DIPL PHYS DR ,  DEIGNER PAUL DR ,  FALK ROLAND DIPL CHEM DR ,  UHL KARL DIPL ING DR ,  SCHAEFER DIETER DIPL CHEM DR ,  MAYER DIETER DR ,  MOTZ HERBERT DIPL ING DR ,  FELLEISEN PETER DIPL ING

IPC: B05C11/08 ,  B05D1/40 ,  G11B5/842 ,  G11B5/84 ,  B05D5/12

Abstract: The invention relates to an improved process for the manufacture of magnetic discs carrying very thin magnetic layers, by applying a fluid dispersion of magnetic materials in a binder mixture to rigid base discs by the spin-coating process. Above the side of the base disc which is to be provided with the magnetic layer, there are arranged means which produce an aerodynamic boundary layer above the discs during rotation of the latter. This avoids the formation of surface irregularities and of coating streaks during production of the layer by spin-coating.