公开(公告)号：CA2067600A1

公开(公告)日：1993-01-03

申请号：CA2067600

申请日：1992-04-29

Applicant: IBM

Inventor： ALBRECHT THOMAS R ,  FOSTER JOHN S ,  HOMOLA ANDREW M

IPC: G11B17/32 ,  G11B21/21 ,  G11B23/50 ,  G11B25/04 ,  G11B33/14 ,  G11B5/60 ,  G11B5/72

Abstract: SA9-91-026 DISK FILE WITH LIQUID FILM HEAD-DISK INTERFACE A disk file with substantially reduced head-disk spacing and corresponding improvement in recording performance uses a disk coated with a film of conventional high viscosity lubricant, a lubricant reservoir for replenishing the lubricant on the disk over the life of the file, and a transducer carrier with feet which ski on the high viscosity liquid film. The file does not include any means for recirculating the lubricant since the lubricant spins off the disk at a relatively low rate due to its high viscosity. The lubricant reservoir contains a very small amount of lubricant and thus may be maintained inside the substantially sealed disk file. In one embodiment of the invention, the sealed disk file is essentially evacuated. The operation of the disk file in a near vacuum environment is possible because, unlike conventional disk files, air is not required to support an air-bearing head-disk interface and the high vapor pressure of the relatively high molecular weight lubricant prevents its evaporation.

公开(公告)号：CA1251860A

公开(公告)日：1989-03-28

申请号：CA500846

申请日：1986-01-31

Applicant: IBM

Inventor： BANDARA UPALI ,  HOMOLA ANDREW M ,  STEINER WERNER ,  TRIPPEL GERHARD

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

Abstract: MAGNETIC RECORD CARRIER AND METHOD OF MAKING IT The magnetic record carrier consists of a substrate and a magnetic coating which comprises a binder and substantially non-aggregated iron particles. The iron particles can have a coating of SiO2, and can be available either as a thin layer covered with the binder, or homogeneously dispersed in the binder. For making the magnetic record carrier, coated or uncoated iron oxide particles are applied onto the substrate and subsequently reduced in a hydrogen-containing atmosphere at temperatures between 220 and 350.degree.C. In the production where the iron particles are distributed in the binder, reduction takes place after a dispersion containing the binder, the iron oxide particles and a solvent has been spun onto the substrate and cured. In the production where the iron oxide particles form a thin layer, reduction is effected after the coated iron oxide particles have been applied onto the substrate as a mono-layer. It is only then that a dispersion containing the binder and a solvent is applied and cured.

公开(公告)号：CA1137296A

公开(公告)日：1982-12-14

申请号：CA370485

申请日：1981-02-10

Applicant: IBM

Inventor： HOMOLA ANDREW M ,  RICE SONDRA L

IPC: G11B5/712 ,  C09D5/23 ,  C09D7/12 ,  G11B5/842 ,  H01F1/44 ,  B01J13/00

Abstract: A magnetic dispersion is prepared by adjusting the pH of a mixture containing magnetic particles to a value which results in a positive electrostatic charge on the particles, while a mixture containing colloidal silica particles at the same pH results in negative electrostatic charges on the silica particles. Combining these mixtures causes the silica particles to coat and irreversibly bond to the magnetic particles resulting in better dispersion and less aggregation of the magnetic particles. SA979043

公开(公告)号：CA2067601A1

公开(公告)日：1993-01-03

申请号：CA2067601

申请日：1992-04-29

Applicant: IBM

Inventor： ALBRECHT THOMAS R ,  FOSTER JOHN S ,  HOMOLA ANDREW M

IPC: G11B21/21 ,  G11B25/04 ,  G11B5/60 ,  G11B5/72

Abstract: Described is a transducer assembly for use in a disk file which provides substantially reduced head-disk spacing and a corresponding improvement in recording performance. The assembly includes a transducer carrier with feet which ski on a high viscosity liquid film with which the disk is coated. Also described is a disk file incorporating such a transducer assembly.