公开(公告)号：DE3567971D1

公开(公告)日：1989-03-02

申请号：DE3567971

申请日：1985-06-13

Applicant: IBM DEUTSCHLAND ,  IBM

Inventor： BRUNSCH ARWED DR DIPL PHYS ,  STEINER WERNER DIPL ING ,  TRIPPEL GERHARD DR DIPL PHYS

IPC: G11B5/70 ,  G01N27/74 ,  G01R33/12 ,  G11B5/84

Abstract: A method and apparatus is provided for characterizing magnetic coating compositions that contain magnetic particles dispersed in a solvent resin matrix. The coating composition, as it passes through a tube, is subjected to an alternating magnetic field and perpendicular thereto a constant magnetic field of appropriate field strength and duration. Via a measuring coil surrounding the tube the induced signal in the composition is monitored and the degree of dispersion, is measured by measuring the magnetic susceptibility of the coating material. By applying a constant magnetic field the degree of dispersion cna be changed at least for a certain time. The method and apparatus of the present invention can be incorporated into a coating apparatus to monitor and improve the magnetic characteristics of the coating material being applied to a substrate.

公开(公告)号：DE3719200A1

公开(公告)日：1988-12-29

申请号：DE3719200

申请日：1987-06-09

Applicant: IBM DEUTSCHLAND

Inventor： GRESCHNER JOHANN DIPL PHYS DR ,  SCHMID GERHARD DIPL PHYS DR ,  STEINER WERNER DIPL ING ,  TRIPPEL GERHARD DIPL PHYS DR

IPC: B29D17/00 ,  G11B7/24 ,  G11B7/253 ,  G11B7/26 ,  G11B21/06

Abstract: An optical storage disk consists of a glass substrate (1) into which guide tracks (3) for servo-controlling the focussed light beams are directly stamped by a hot stamp process. After stamping, the glass substrate is thermally quenched in the stamping device to increase its breaking resistance through thermal curing. In order to achieve uniform guide tracks over the entire surface of an optical storage disk, flexible stamp stencils (35) in a flexible holder (34) are used whose curvature can be changed by applying hydro-static pressure. Suitable stamp stencils consist of monocristalline silicon disks with surface hardening, or of metal disks, structured in photolithographic processes. The stamp lands are made with bevelled edges to facilitate the separating of stamp and glass substrate after cooling.

公开(公告)号：DE3575035D1

公开(公告)日：1990-02-01

申请号：DE3575035

申请日：1985-04-26

Applicant: IBM DEUTSCHLAND

Inventor： BANDARA UPALI DR DIPL CHEM ,  HOMOLA ANDREW M DR DIPL CHEM ,  STEINER WERNER DIPL ING ,  TRIPPEL GERHARD DR DIPL PHYS

IPC: C09D5/23 ,  C09D163/00 ,  C09D177/00 ,  G11B5/706 ,  G11B5/712 ,  G11B5/845 ,  G11B5/842