Glass key top, key top marking method, and method for manufacturing key unit using the same
US7531765B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 27, 2003 |
| Grant date | May 12, 2009 |
| Priority date | — |
| Expiry date | Aug 13, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49105
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There are provided a glass key having a character or symbol marked in an enduring state and a marking method for creating such a glass key. A glass key has a character or a symbol marked on the surface or in the glass medium of the key top. A laser beam belonging to an infrared band having a wavelength of about 1100 nm or below, visible light band, or ultraviolet light band is intermittently applied while focused on the surface of the transparent glass key top or inside of the key top including the upper position, intermediate position, lower position, or other desired position, so that a plenty of fine cracks are formed as a set to represent a character or a symbol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.