Method for making a marking in a glass body
US6596966B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2000 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Sep 15, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/26
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for making a marking which is located beneath the surface of a glass body, in which the glass has a transmission curve with a plateau area at wavelengths which are longer than those of X-rays. A laser beam is directed onto a surface of the body. The laser beam can penetrate the body to a predetermined depth of the marking and is focused at the predetermined place of the marking inside the glass. The laser beam has a power density high enough to mark this location, essentially without changing the surface of the glass body in any perceptible way. The method is characterized in that a wavelength of the laser is used which makes the glass partially translucent and which is shorter than all the wavelengths of the laser light corresponding to the plateau area of the respective transmission curve. Using this method, very fine markings can be produced spaced a small distance underneath the surface of the glass body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.