DEVICE FOR REDUCING THE PRESENCE OF MOISTURE WITHIN AN ENCLOSURE CONTAINING A HEAT SOURCE

摘要

A venting device (50) that reduces the moisture of an enclosure containing a heat source and prevents the entrance of water or other liquids and contamination from entering the enclosure. The moisture reducing device (50) comprises a drying agent or desiccant (42) which is adjacent to said heat source (such as an automotive headlamp bulb or thermally cycling device), an air-impermeable, water-vapor permeable layer (40), a vent (52) that allows bulk flow of air during thermal cycling of the heat source and a internal diffusion tube or channel (65) that limits the entrance of moisture vapor from the external atmosphere to the drying agent or desiccant (42). The air-impermeable, water-vapor permeable layer (40) allows for continuous diffusion of water vapor, reducing the moisture in the enclosure when the heat source is de-energized. The location of the device to the heat source regenerates the drying agent in the device when the heat source is energized. The device may be in a variety of shapes for ease of placing the device adjacent to the heat source.