Abstract: A printed circuit board has a terminal area to which the terminal area of a sheet member is electrically connected. The sheet member is bonded to the printed circuit board with a hot-melt adhesive. The layer of the hot-melt adhesive which is formed on the sheet member and does not face the terminal area of the printed circuit board protrudes from the surface of the terminal area of the sheet member. The printed circuit board includes an insulating substrate made from a material containing silicon dioxide. A metal salt that imparts hydrophobicity to the bonded surface of the substrate is added to the layer of the hot-melt adhesive.

Abstract: A membrane switch comprises an insulating substrate on the surface of which thin-film-like electrodes are formed with a connecting lug section provided integrally at one end of the substrate. Thin-film-like conductive layers continuing from the electrodes are extending up to the connecting lug section and the extended end portions of the conductive layers compose a connecting terminal section.

Abstract: A hot-melt adhesive which is particularly suitable for an adherend surface carrying silanol groups. The adhesive contains a compound capable of combining chemically with oxygen in the silanol groups to render the adherend surface hydrophobic.