Laser treatment of electrical steel and optical scanning assembly therefor
US4468551A · kind A · utility
68Cited by
13References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1982 |
| Grant date | Aug 28, 1984 |
| Priority date | — |
| Expiry date | Jul 30, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K2103/04
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Apparatus for scanning a continuous wave Nd:YAG laser beam across a moving strip of grain oriented silicon steel having an insulative coating to subdivide the magnetic domains of the strip to improve core loss without damage to the insulative coating. The laser beam is scanned by a multiple-faced rotating mirror and focused onto the strip surface by a flat field lens and cylindrical lens to produce a scan line of narrow width having the required irradiation energy, dwell time and line spacing at the surface of the moving strip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.