Visual display apparatus for electrical signals recorded on a magnetic medium
US4345820A · kind A · utility
4Cited by
0References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 12, 1980 |
| Grant date | Aug 24, 1982 |
| Priority date | — |
| Expiry date | May 12, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/087
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The apparatus for the visual display of electrical signals recorded on a magnetic medium or support is in the form of a "magnifying glass" which is a plate or sheet of transparent material in which there is a dimple closed by a membrane. The volume of the dimple is filled by a mild ferrite dispersion in a liquid. Under the action of the magnetic field, the ferrite particles are displaced and give an image of the magnetic state of the media.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.