The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 2019
Filed:
Nov. 21, 2013
Method and apparatus for controlling opening of an auto-darkening filter in an eye protection device
Optrel Holding Ag, Appenzell, CH;
Sheng Yang, Wattwil, CH;
OPTREL HOLDING AG, Appenzell, CH;
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.