Anti-glare protection device
US8181270B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 2005 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Apr 17, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/20
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An anti-glare protection device for a welding mask includes a transmission control circuit for determining a darkening signal from a control signal, a welding activity detection circuit (6) for detecting a welding activity, based on the output of a first sensor circuit. The welding activity detection circuit is arranged to control, via an activation switch, whether either the darkening signal or a signal corresponding to an undarkened optical filter is input to a filter drive circuit. The filter drive circuit drives a controllable optical filter to a transmission value according to the signal input to the filter drive circuit. A manual input device allows a user to manually adjust a user selected signal. A second sensor circuit determines a sensed signal. A manually operable mode selection switch for selecting either, in a manual mode, the user selected signal or, in an automatic mode, the sensed signal to be used as the control signal to the transmission control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.