Patent ID: 7538645
Filing Date: 2009-05-26
Classification: H01H

Abstract:
1. An electromagnetic relay comprising: a main body comprising an electrical contact portion, an electromagnetic driving portion, and a molded resin base for mounting said electrical contact portion and said electromagnetic driving portion; wherein said main body is covered with a molded resin cover and is sealed with a sealing resin and wherein one or more through-holes are formed by applying laser beam to desired positions of said molded resin cover from an inner surface side thereof so that said through-holes each are within a size range in which no invasion of water from an outer side into the inner surface side thereof occurs and in which air permeability of said molded resin cover can be maintained through said through-holes, wherein a diameter φA of the through-holes at the inner surface and a diameter φB of the through holes at an outer side surface of said molded resin cover have a relation where “t” denotes a thickness of molded resin and “φ” denotes an angle related to focusing of the laser beam.