Patent ID: 6364924
Filing Date: 2002-04-02
Classification: F21S,H05K,Y10S

Abstract:
An air-permeable cap comprising a closed-end cylindrical cover member, a substantially cylindrical body fitted in said closed-end cylindrical cover member, and an air passage formed between the inner wall of said closed-end cylindrical cover member and the outer wall of said substantially cylindrical body and between the bottom surface of said closed-end cylindrical cover member and the lower end of said substantially cylindrical body, wherein the mounting portion at which the air-permeable cap is mounted on the mounting opening of the housing is formed at the top of said substantially cylindrical body, and a plurality of protrusions are formed at a predetermined interval along the periphery of said substantially cylindrical body, said protrusions come in contact with the inner wall of said closed-end cylindrical cover member so that said cylindrical body is positioned and fixed and an air passage is formed between said protrusions.