Electro-optic welding lens assembly

Details Electro-optic welding lens assembly Electro-optic welding lens assembly

1988-04-20

1989-09-05

Heyman, John S.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340784, 2 8, 2431, G02F 1133, G09G 336, A61F 900, A61F 902

Patent

active

048632449

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 light rays are present in the ambient environment.

REFERENCES:
patent: 3873804 (1975-03-01), Gordon
patent: 4039803 (1977-08-01), Harsch
patent: 4279474 (1981-07-01), Belgorod
patent: 4620322 (1986-11-01), Eggenschwiler et al.

Affiliated with

Also associated with

Rating

Electro-optic welding lens assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electro-optic welding lens assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electro-optic welding lens assembly will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-238475