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    • 4. 发明授权
    • Electro-optic welding lens assembly
    • 电光焊接镜头组件
    • US4863244A
    • 1989-09-05
    • US183915
    • 1988-04-20
    • Rupert FuerthbauerDaniel Stanelli
    • Rupert FuerthbauerDaniel Stanelli
    • G02F1/13A61F9/06
    • A61F9/067
    • 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.
    • 一种用于焊工头盔或保护性眼罩中的电光焊接透镜组件,包括适于对其光透射进行控制的至少一个液晶滤光元件以及用于改变光透射率的控制装置 液晶滤芯。 控制装置包括第一可手动调节的控制电路,其独立于落在透镜组件上的光量而工作,并且包括用于调节通过液晶滤光元件的光速的装置。 此外,提供了相对于落在透镜组件上的光量操作的第二自动操作控制电路。 第二控制电路仅在高于预定阈值的光强度的范围内操作,以限制通过液晶滤光元件的光的透射率。 第二控制电路分别覆盖并补偿第一控制电路在落在透镜组件上的光强度的阈值以上的范围内的影响,如果存在有害的光线,则透镜组件不能被打开得太多 在周围环境中。