公开(公告)号：DE2254981A1

公开(公告)日：1974-06-12

申请号：DE2254981

申请日：1972-11-10

Applicant: BASF AG

Inventor： MAHLER KARL DIPL ING DR ,  FEHRENBACH HUBERT ,  KRUG ARIBERT ,  FALE ROLAND DR

IPC: C08L75/04 ,  G11B5/708 ,  G11B5/73 ,  G11B5/733 ,  G11B5/84 ,  G11B5/70

公开(公告)号：GB2131220B

公开(公告)日：1986-09-10

申请号：GB8327425

申请日：1983-10-13

Applicant: BASF AG

Inventor： FELLEISEN PETER ,  KRUG ARIBERT ,  GROSSHANS PETER

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

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：DE2357517A1

公开(公告)日：1975-05-28

申请号：DE2357517

申请日：1973-11-17

Applicant: BASF AG

Inventor： HARTMANN JOB-WERNER DIPL CHEM ,  FALK ROLAND DIPL CHEM DR ,  KRUG ARIBERT ,  HUBER GEORG ,  BALZ WERNER DIPL CHEM DR ,  MAHLER KARL DIPL ING DR

IPC: G11B5/845 ,  G11B5/68 ,  G11B5/84

Abstract: The film undergoing the magnetisation process may be applied to both sides of the metallic disc. The film is a mixture of binding material and anisotropic magnetic particles and is applied on the disc in a liquid form. It is spread by centrifugal force, with the disc rotating at high speed. It is magnetised, hardened, ground and then polished. One pair of poles is so arranged that magnetism spreads into the symmetrical plane and forms another even shaped pole pair but of opposite polarity and which converges pointed to the symmetry plane. The distance between the magnetic crests is greater than that of the pole faces and the flux density greates near the poles. The position of the poles is adjustable; during the film application they move toward each other. With this method of film application the reading potential is improved by 50%.

公开(公告)号：GB2131220A

公开(公告)日：1984-06-13

申请号：GB8327425

申请日：1983-10-13

Applicant: BASF AG

Inventor： FELLEISEN PETER ,  KRUG ARIBERT ,  GROSSHANS PETER

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

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：DE2910807A1

公开(公告)日：1980-09-25

申请号：DE2910807

申请日：1979-03-20

Applicant: BASF AG

Inventor： DEIMLING KARL ,  FALK ROLAND DIPL CHEM DR ,  KRUG ARIBERT ,  NAGEL PETER DIPL ING ,  SAND RUDOLF

IPC: C09G1/18 ,  C09G1/00

Abstract: A process for polishing the ground surfaces of magnetic storage disks which consist of a rigid substrate provided on both sides with a firmly adhering magnetic coating consisting of a magnetic material finely dispersed in an organic polymer and conventional additives, by pressing felt rings or felt disks against the moving magnetic storage disk, to the surface of which an aqueous emulsion containing butyl acetate with or without butane-1,4-diol is applied.

公开(公告)号：DE2410823A1

公开(公告)日：1975-09-18

申请号：DE2410823

申请日：1974-03-07

Applicant: BASF AG

Inventor： FALK ROLAND DIPL CHEM DR ,  KRUG ARIBERT ,  FEHRENBACH HUBERT ,  MAHLER KARL DIPL ING DR

IPC: G11B5/73 ,  G11B5/84 ,  B23P13/00

Abstract: The discs are faced using diamond tools whilst being held by vacuum onto a faceplate. The faceplate has a layer of resilient material on which the storage disc is seated during facing. The resilient material, e.g. rubber or plastics has a modulus of between 25 and 180 kp/cm2, a Shore A hardness between 30 and 90, a compression set according to DIN 53517 of below 10%, and good grindability. The thickness of the layer is pref. between 0.2 and 5 mm. Facing may be carried out in two stages with different resilient materials and intermediate stress-relieving of the discs.