Light protection apparatus comprising an electrically controllable light protection filter element
DCFirst Claim
1. A light protection apparatus, particularly for welder'"'"'s protective helmets, welder'"'"'s protective eyeglasses or welder'"'"'s protective shields, comprising a light protection filter element, the optical transmission thereof being electrically controllable, a control means connected to said light protection filter element to control the optical transmission of said light protection filter element, said control means comprising a plurality of light sensitive sensor means to control the light transmission of said light protection filter element in dependence of the light falling onto said sensor means, said light protection filter element being provided with shield means adapted to shield each of said sensor means against interfering light falling onto said sensor means in at least one preselected direction.
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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.
32 Citations
27 Claims
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1. A light protection apparatus, particularly for welder'"'"'s protective helmets, welder'"'"'s protective eyeglasses or welder'"'"'s protective shields, comprising a light protection filter element, the optical transmission thereof being electrically controllable, a control means connected to said light protection filter element to control the optical transmission of said light protection filter element, said control means comprising a plurality of light sensitive sensor means to control the light transmission of said light protection filter element in dependence of the light falling onto said sensor means, said light protection filter element being provided with shield means adapted to shield each of said sensor means against interfering light falling onto said sensor means in at least one preselected direction.
- 2. A light protection apparatus, particularly for welder'"'"'s protective helmets, welder'"'"'s protective eyeglasses or welder'"'"'protective shields, comprising a light protection filter element, the optical transmission thereof being electrically controllable, a control means connected to said light protection filter element to control the optical transmission of said light protection filter element, said control means comprising a light sensitive sensor means to control the light transmission of said light protection filter element in dependence of the light falling onto said sensor means, said light protection filter element being provided with shield means ad pated to shield said sensor means against interfering light falling onto said sensor means in at least on preselected direction.
- 23. A light shield member for a light protection apparatus, particularly for welder'"'"'s protective helmets, welder'"'"'s protective eyeglasses or welder'"'"'s protective shields, said light protection apparatus comprising a light protection filter element, the optical transmission thereof being electrically controllable a control means connected to said light protection filter element to control the optical transmission of said light protection filter element, said control means comprising a light sensitive sensor to control the light transmission of said light protection filter element in dependence of the light falling onto said sensor, said light shield member comprising an elongated strip member having at least one bore, said strip member being mounted to said light protection filter element in front of said sensor means such that the position of said bore or bores substantially corresponds with the position of said sensor means such that interfering light falling onto said sensor means in at least one preselected direction is shielded.
Specification