| 摘要 |
PROBLEM TO BE SOLVED: To provide a venting device 50 which 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. SOLUTION: The moisture reducing device 50 comprises a drying agent or desiccant 42 which is adjacent to the 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 an 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. COPYRIGHT: (C)2008,JPO&INPIT |
