Patent ID: 7900350

Claim:
A method of manufacturing a wiring board having wiring formed on a substrate, comprising: forming a metal thin film for wiring on the substrate; generating a resist pattern on the metal thin film by using a photomask on which a wiring pattern is formed and the resist pattern having at least one depression at a spot junction; removing the metal thin film selectively by wet etching with the resist pattern and generating the wiring; and joining a lid on the substrate containing a part of the wiring with a binder and making a sealed space above the substrate, wherein at the spot of the wiring joined with the lid by the binder is the spot of junction, a flank for the wiring pattern is depressed in the area corresponding to the spot of junction such that the depression of the resist pattern slows a rate of the wet etching of the metal thin film, the depression of the resist pattern is shaped like a U shape, and a length of the side of the U shape in the direction along the flank is L and a length of the side of the U shape in the direction perpendicular to the flank is d, the following relationship is satisfied: d>L/ 4.