Electro-optic welding lens assembly
US4863244A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Apr 20, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F9/067
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An electro-optic welding lens assembly for use in a welder's helmet or a protective eyeshield and including at least one liquid crystal filter element adapted to be controlled with regard to its light transmission as well as control means for changing the rate of light transmision of the liquid crystal filter element. The control means comprises a first manually adjustable control circuit operating independently of the amount of light falling on the lens assembly and including means for adjusting the rate of light passing through the liquid crystal filter element. Further, there is provided a second automatically operated control circuit operating in relation to the amount of light falling on the lens assembly. The second control circuit operates only within a range of light intensity above a predetermined threshold value to limit the rate of transmission of light passing through the liquid crystal filter element. The second control circuit overrides and compensates, respectively, the effect of the first control circuit in the range above the threshold value of light intensity falling on the lens assembly with the effect that the lens assembly cannot be opened too much if harmful l…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.