Patent · US Active

Method for producing a series of through holes in a layer of material by means of a laser beam

US8405000B2 · kind B2 · utility

0Cited by

1References

8Claims

0Family size

Assignee

Jenoptik Automatisierungstechnik GmbH · DE

Inventors

Walter Lutze · Jena, DE
Martin Griebel · Jena, DE
Michael Nittner · Camburg, DE

Key dates

Filing date	Aug 26, 2009
Grant date	Mar 26, 2013
Priority date	—
Expiry date	Nov 5, 2031

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB23K2103/52
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

The present invention relates to the production of a series of holes in a layer of material, in particular to the production of a target rupture line in a first layer of an airbag cover. The radiation of a plasma that forms during the production of each hole is detected from the surface that is being machined. From the signal pattern derived, the time of the beginning of the signal and the time of the appearance of a falling edge that meets a predetermined edge criterion are detected and stored. The point in time at which the falling edge appears is a switching criterion for switching off the laser. The difference between the two points in time stored for each hole constitutes a quality criterion for the respective hole.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.