| 摘要 |
<p>An engraving apparatus for engraving a surface (S) by means of a laser beam, comprises an engraving head (15) suitable for projecting and focusing, through a suitable opening (41), a laser beam (F) on said surface (S), said engraving head (15) being provided with an inner chamber (40) communicating with said opening (41), the engraving apparatus further comprises circulating means (43, 44, 45, 46, 47) suitable for circulating a gaseous pressurized fluid through said chamber (40) and into said opening (41). <IMAGE></p> |
