Pole design for thin film magnetic heads
US4970615A · kind A · utility
36Cited by
6References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 26, 1989 |
| Grant date | Nov 13, 1990 |
| Priority date | — |
| Expiry date | May 26, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3163
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thin film magnetic head including top and bottom pole tips having reversed trapezoidal cross sections. Mirror image symmetry across a gap region may be achieved. The top and bottom pole tips may be formed using a photolithographic process using positive photoresist including post bake and flood exposure steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.