Curved, arcuately-bonded liquid-crystal cells that include substrates held together by an edge adhesive cured after the substrates were bent into a congruently curved configuration; methods of making such cells; and, switchable shutters and automatic darkening filters that include such cells.

Sensor assisted head mounted displays for welding are disclosed. Disclosed example head mounted devices include an optical sensor, an augmented reality controller, a graphics processing unit, and a semi-transparent display. The optical sensor collects an image of a weld environment. The augmented reality controller determines a simulated object to be presented in a field of view, a position in the field of view, and a perspective of the simulated object in the field of view. The graphics processing unit renders the simulated object based on the perspective to represent the simulated object being present in the field of view and in the weld environment. The display presents the rendered simulated object within the field of view based on the position. At least a portion of the weld environment is observable through the display and the lens when the display is presenting the rendered simulated object.

Sensor assisted head mounted displays for welding are disclosed. Disclosed example head mounted devices include an optical sensor, an augmented reality controller, a graphics processing unit, and a semi-transparent display. The optical sensor collects an image of a weld environment. The augmented reality controller determines a simulated object to be presented in a field of view, a position in the field of view, and a perspective of the simulated object in the field of view. The graphics processing unit renders the simulated object based on the perspective to represent the simulated object being present in the field of view and in the weld environment. The display presents the rendered simulated object within the field of view based on the position. At least a portion of the weld environment is observable through the display and the lens when the display is presenting the rendered simulated object.

The present application discloses a lockable fitting structure used for an electric air-purifying respirator of an auto-darkening welding helmet, the electric air-purifying respirator comprising a housing and a battery device, a battery holder being formed in the housing, and the battery device being able to be detachably installed in the battery holder by the lockable fitting structure, wherein the lockable fitting structure comprises at lease four pairs of sliding joint structures formed on the battery device and the battery holder respectively and a locking structure provided in the battery device, wherein the sliding joint structures of each pair can be engaged with or disengaged from each other by sliding them relative to each other, wherein the locking structure comprises a button and a tongue capable to be actuated by the button, wherein the tongue is movable along a direction substantially perpendicular to a sliding direction of the sliding joint structure, and wherein after the sliding joint structures have been moved relative to each other in place, the tongue contacts a stop side of the battery holder to lock the pairs of sliding joint structures. The present application also discloses an electric air-purifying respirator for an auto-darkening welding helmet, which is equipped with said lockable fitting structure.

The present application discloses a lockable fitting structure used for an electric air-purifying respirator of an auto-darkening welding helmet, the electric air-purifying respirator comprising a housing and a battery device, a battery holder being formed in the housing, and the battery device being able to be detachably installed in the battery holder by the lockable fitting structure, wherein the lockable fitting structure comprises at lease four pairs of sliding joint structures formed on the battery device and the battery holder respectively and a locking structure provided in the battery device, wherein the sliding joint structures of each pair can be engaged with or disengaged from each other by sliding them relative to each other, wherein the locking structure comprises a button and a tongue capable to be actuated by the button, wherein the tongue is movable along a direction substantially perpendicular to a sliding direction of the sliding joint structure, and wherein after the sliding joint structures have been moved relative to each other in place, the tongue contacts a stop side of the battery holder to lock the pairs of sliding joint structures. The present application also discloses an electric air-purifying respirator for an auto-darkening welding helmet, which is equipped with said lockable fitting structure.

System has an optical sensor (1), an aperture with the optical element (2) with the changeable permeability and an activation light (3) emitting radiation, which is detected by the optical sensor (1). The activation light is connected with the switch (4) and it is placed within the reach of the optical sensor (1). Within a device which realizes the technological process with the luminous manifestation the instruction for the beginning of a given technological process is detected and on the basis of this instruction the activation light (3) lights up. This activates the optical sensor (1) by means of the activation light (3) before the optical sensor (1) detects the luminous manifestation of the technological process itself. The activation light (3) can be a simple infrared LED diode. The advantage lies in the fact that the protective device itself does not have to be modified in any way and its reaction time can be shortened to zero, or negative reaction time can be achieved since we use time passing during the initiation of the technological process before the appearance of the luminous manifestation for the darkening.

System has an optical sensor (1), an aperture with the optical element (2) with the changeable permeability and an activation light (3) emitting radiation, which is detected by the optical sensor (1). The activation light is connected with the switch (4) and it is placed within the reach of the optical sensor (1). Within a device which realizes the technological process with the luminous manifestation the instruction for the beginning of a given technological process is detected and on the basis of this instruction the activation light (3) lights up. This activates the optical sensor (1) by means of the activation light (3) before the optical sensor (1) detects the luminous manifestation of the technological process itself. The activation light (3) can be a simple infrared LED diode. The advantage lies in the fact that the protective device itself does not have to be modified in any way and its reaction time can be shortened to zero, or negative reaction time can be achieved since we use time passing during the initiation of the technological process before the appearance of the luminous manifestation for the darkening.

An automatic darkening filter assembly for a welding protector and a welding protector that includes the automatic darkening filter assembly. The automatic darkening filter assembly has a housing that forms an opening in which a switchable light filter is arranged. The switchable light filter is retained by a first and a second resilient gasket that are arranged on opposite sides of the switchable light filter and which each extend circumferentially adjacent a periphery of the switchable light filter. The invention helps maximizing the robustness of the welding protector and facilitates assembly.

An automatic darkening filter assembly for a welding protector and a welding protector that includes the automatic darkening filter assembly. The automatic darkening filter assembly has a housing that forms an opening in which a switchable light filter is arranged. The switchable light filter is retained by a first and a second resilient gasket that are arranged on opposite sides of the switchable light filter and which each extend circumferentially adjacent a periphery of the switchable light filter. The invention helps maximizing the robustness of the welding protector and facilitates assembly.

An improved personal protective device and composition thereof. The device comprises arc flash spectacles or goggles, an arc flash faceshield or an arc flash hood window to provide optical clarity, specifically color acuity. The spectacles or goggles, the faceshield and the hood window include polycarbonate material for high-impact, high-mass performance, and surface charring during arc flash exposure and provides an arc flash protective rating of at least 4 cal/cm.sup.2 (in the case of eyewear and face shields) or at least 15 cal/cm.sup.2 (in the case of hood windows).