Method for manufacturing a magnetic recording medium
US4508752A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1984 |
| Grant date | Apr 2, 1985 |
| Priority date | — |
| Expiry date | Jul 26, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C55/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for manufacturing a magnetic recording medium of the invention, comprises the steps of coating a magnetic paint consisting mainly of a needle-like magnetic powder and a binder on a nonmagnetic support to form a coating film; applying a DC magnetic field of a predetermined direction obtained with a superconductive solenoid magnet to the coating film in which the needle-like magnetic powder is still mobile, thereby orienting the needle-like magnetic powder in the predetermined direction; and drying the coating film. In a magnetic tape prepared by this method, a residual magnetic flux density is improved by about 10 to about 20% over the conventional tape, and tape the sensitivity and output are significantly improved. Since only a permanent current need be flown through a superconductive wire having a substantially zero electric resistance, power loss due to heat generation may be eliminated. Running cost of a cooling device or the like may be significantly reduced, so that the method of the present invention is also advantageous from the view point of energy conservation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.