Welding lens with integrated display and method
US6067129A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 15, 1996 |
| Grant date | May 23, 2000 |
| Priority date | — |
| Expiry date | Mar 15, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/32
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An integral indicator or display for a welding lens, which has a twisted nematic liquid crystal cell light shutter, includes plural independently operable twisted nematic liquid crystal cell indicator portions integral with the light shutter twisted nematic liquid crystal cell, indicia associated with respective indicator portions to indicate an operating characteristic of the welding lens, circuitry for operating the lens and the indicator portions, and one or more switches for stepping the circuit through respective settings of operating characteristics, such as shade darkness, sensitivity and delay time. The indicator is dark when the light shutter is dark, and the light shutter may include in optical series with the twisted nematic liquid crystal cell, a birefringent liquid crystal cell light shutter which is faster acting than the twisted nematic liquid crystal cell and can be driven to various shades at respective speeds depending on applied electric field. A method of protecting the eyes of a welder includes selecting an operating characteristic of a welding lens and using a display portion of the welding lens to display an operating characteristics of the welding lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.