| 摘要 |
PROBLEM TO BE SOLVED: To take static electricity countermeasures without increasing or expanding man-hours for production by preventing the inflow of static electricity to a circuit board by closing an air gap between a case and a photodetecting lens with an insulating material by holding a gasket composed of a non- conductive material at the connecting part of the case and photodetecting lens. SOLUTION: A photodetecting part for keyless entry is composed of a semispherical photodetecting lens 18 composed of polycarbonate resin fitted into a circular hole 17 opened on the bottom wall of cover 13, and the surrounding of photodiode is covered with this photodetecting lens 18. Then, a loop- shaped gasket 22 composed of a silicon rubber sheet material coating its both sides with adhesive agents is held between a flange-shaped part 19 of circular hole 17 and the opening end face of photodetecting lens 18. Thus, the formation of an air gap at the connecting part of cover 13 and photodetecting lens 18 is prevented in extremely simple structure, and a surge current caused by static electricity can be prevented from flowing into the photodetecting circuit. |
