Method and system for laser perforation of sheet material
US4439663A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1981 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Jul 24, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K26/0648
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In the perforation of sheet material by light energy, a continuous focused laser beam is reflected from different locations along the beam axis to provide separate pulsed beams and the beams are issued onto the sheet material with the same beam cross-sectional area. In one aspect, the lengths of respective different light paths for conveyance of light from the point of focus of the laser to final image locations are made equal. In another aspect, different focusing elements may be included in light paths to provide for sameness of beam cross-sectional area at the final image locations. The light paths are preferably provided in part by light conducting apparatus having light-reflective elements mounted for movement, such that different perforation matrices may be readily attained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.