Automatic darkening filter (ADF) eye protection device with improved drive circuitry
US8264265B2 · kind B2 · utility
2Cited by
7References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2010 |
| Grant date | Sep 11, 2012 |
| Priority date | — |
| Expiry date | Oct 7, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F9/067
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus and methodology for operating an automatic darkening filter (ADF) eye protection device alternately applies an operating voltage to a pair of control terminals of an ADF device circuit in a continuing sequence, where a first polarity voltage is applied to the pair of terminals and then reversed. A delay period is provided between application of the alternating polarities. In some embodiments ground potential is applied to both terminals of the pair of terminals during the delay period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.