Patent · US Active

Laser marking method, laser marking apparatus and optical element

US8115792B2 · kind B2 · utility

15Cited by

11References

26Claims

0Family size

Assignee

3D-Micromac AG · DE

Inventors

Tino Petsch · Chemnitz, DE
Bernd Keiper · Neustadt an der Orla, DE
Sven Albert · Kohren-Sahlis, DE
Thomas Hoeche · Bodenwerder, DE

Key dates

Filing date	Oct 27, 2009
Grant date	Feb 14, 2012
Priority date	—
Expiry date	Oct 7, 2030

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB23K2103/42
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

In a method for producing a permanent mark in an optical element which consists essentially of a material that is transparent in the visible spectral region, a marking region of the optical element is irradiated with laser radiation in order to generate local, near-surface material changes in such a way that a mark of prescribed shape and size is generated. The laser radiation has an operating wavelength λ from the wavelength region between 1.1 μm and 9.2 μm. A thulium-doped fiber laser is preferably used as laser radiation source. The operating wavelength is selected in dependence from the material of the optical element such that the material exhibits a partial absorption with a transmittance between 60% and 98%. The method can be used, in particular, to provide spectacle lenses, contact lenses or intraocular lenses with marks.

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