Method and apparatus for perforation of sheet material by laser
US4410785A · kind A · utility
11Cited by
42References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1981 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | Nov 2, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K26/0846
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In providing perforation uniformity both in the spacing between multiple rows of perforations in sheet material and in the spacings among perforations within each row, a common laser beam is shared among the rows, being directed to the sheet material through a common focusing element for each adjacent pair of rows. In conducting the laser beam to each such common focusing element, a pair of modified beams is derived from the laser beam, each modified beam having light ray content divergent about an axis of symmetry thereof which is parallel to the optical axis of the focusing element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.