Laser welding method for preparation of electron gun of color cathode-ray tube
US5299965A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1992 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Dec 21, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K33/006
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A laser welding method for preparation of an electron gun of a color cathode-ray tub. This laser welding comprises the steps of forming a coining part on an evaporation section of a weld zone of an upper part to be welded to a lower part, and focusing a laser beam on a bottom surface of the coining part. This coining part has a diameter larger than a diameter of the evaporation section and is formed in such a manner that it permits the weld zone of the upper part to have a predetermined thickness. In accordance with this laser welding, a weld nugget formed at the juncture between the upper and lower parts by is enlarged in its diameter and, as a result, increases the weld strength between the upper and lower parts. The coining part has a bottom surface of a plane surface or a curved surface. This laser welding can weld all of the parts of the electron gun even when an upper part to be welded to a lower part is thicker than the lower part and permit the welding condition to be easily determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.