Antiglare device for welding protective masks
US6941577B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 2001 |
| Grant date | Sep 13, 2005 |
| Priority date | — |
| Expiry date | Feb 12, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F9/067
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A glare protection device for a welding protective mask includes an active electro-optical protective filter (2) and an electronic circuit (10). An UV-detector (UVD), which serves as an optical sensor, detects the welding light and, via an evaluation circuit (10.1), generates a signal (sin) for controlling of the protective filter (2). The signal corresponds to the detected UV intensity. The UV-detector includes a fluorescent layer (F) with an absorption in the UV range and an emission in the long-wave range corresponding to the spectral sensitivity of an assigned Si-photo detector (SD). This results in a simple and safe controlling of the protective filter, which is uninfluenced by the effects of extraneous light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.