Patent ID: 7215021
Filing Date: 2007-05-08
Classification: G01F,H01L,H05K

Abstract:
1. An electronic device contained in a case member which is disposed in an air cleaner or an air duct of an automobile, comprising: a substrate having electronic elements mounted thereon, and conductor wire films made of silver or silver alloys, the conductor wire films being connected to the elements; an insulating overcoat film made of a material selected from the group consisting of glass and resin covering the surface of the device, including the conductor wire films; wherein, the overcoat has openings through which surfaces of the conductor wire films are exposed; the openings are formed in a shape having no square corners and no acute angle corners; the entire exposed surfaces of the conductor wire films are covered with a solder whose main component is tin, whereby the exposed surfaces of the conductor wire films are protected from any corrosive gas that may enter the case member; and said electronic elements and said insulating overcoat comprise thick film elements formed on said substrate.