Method and apparatus for controlling opening of an auto-darkening filter in an eye protection device
US10251786B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 2013 |
| Grant date | Apr 9, 2019 |
| Priority date | — |
| Expiry date | Jul 26, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F9/065
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An eye protection device for a welding mask or the like includes a welding activity detection circuit that is configured to detect welding activity, and a filter driver that controls an optical filter to be in undarkened and darkened states. The filter driver is configured to (i) provide a slower and/or gradual opening of the filter, (ii) insert a user-selected delay and/or gradient between the end of welding activity and the opening of the filter, and/or (iii) cause variation of light transmission values of the filter between a darkened state and an undarkened state based on varying brightness detected by a brightness sensor during transition of the filter from a darkened state to an undarkened state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.