Automatic throat height control for film head
US4841625A · kind A · utility
28Cited by
2References
7Claims
0Family size
Assignees
Inventor
Key dates
| Filing date | May 3, 1984 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | May 3, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49044
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A lapping guide is provided to determine the position at which lapping of a thin film head to define pole faces should be terminated. Accurate positioning of the lapping guide with respect to the head is insured by forming various elements of the lapping guide during the same photolithographic process steps as those used to form elements of the head. The lapping guide may be used either as an electrical or optical guide. When used as an optical guide, a second lapping guide may be provided as an indicator that more frequency inspection is necessary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.