Method for marking a sapphire watch crystal
US11320790B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 2020 |
| Grant date | May 3, 2022 |
| Priority date | — |
| Expiry date | Mar 16, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B45/0084
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for marking a sapphire watch crystal, through the interaction between a laser beam and the sapphire. The beam is focused on a point inside the crystal and the interaction is such that it produces a rectilinear opaque area, which is parallel to the upper surface of the crystal or perpendicular to the surface. The orientation of the opaque area depends on the mode of operation applied. According to the hatching mode of operation, the beam is scanned along one or more linear paths, producing opaque lines inside the crystal, which are parallel to the upper surface. The perforation mode of operation produces distinct opaque areas, obtained by discontinuous operation of the beam on a number of juxtaposed points. According to this latter mode of operation, the opaque areas extend in the direction perpendicular to the upper surface of the crystal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.