Light protection apparatus comprising an electrically controllab

Details Light protection apparatus comprising an electrically controllab Light protection apparatus comprising an electrically controllab

1992-08-27

1994-04-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250205, 2 8, 359 66, G02F 113, A61F 906

Patent

active

053028155

ABSTRACT:
The invention provides a light protection apparatus, particularly for welder's protective helmets, welder's protective eyeglasses or welder's protective shields. It comprises a light protection filter element, the optical transmission thereof being electrically controllable, and a control box connected to the light protection filter element to control the optical transmission of the light protection filter element. The control box comprises one or several light sensitive sensor to control the light transmission of the light protection filter element in dependence of the light falling onto the sensor or sensors, respectively. The light protection filter element is provided with shield elements adapted to shield the sensor against interfering light falling onto the sensor in at least one preselected direction.

REFERENCES:
patent: 4155122 (1979-05-01), Budmiger
patent: 4863244 (1989-09-01), Fuerthbauer et al.
patent: 4920257 (1990-04-01), Fuerthbauer et al.
patent: 4933550 (1990-06-01), Hegyi

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