Patent ID: 6838969

Claim:
An electromagnet assembly for an electromagnetic apparatus comprising: a ring member comprising a tubular spool with a pair of annular flanges projecting radially from said spool; a coil bobbin comprising said ring member and an electrical wire, said electrical wire wound around said spool between said flanges; a ring case comprising an annular groove, which has an open edge, said coil bobbin disposed in said annular groove; an opening formed through said ring case adjacent to said closed end surface of said ring case; a connector comprising a case and a cap, said case having a closed shape and a bottom, said cap closing an open end of said case, said connector disposed on said ring case adjacent to said closed end surface and covering said opening; and a first end and a second end of said electrical wire, and a first lead wire and a second lead wire of an external electric circuit connected to said first and said second ends, respectively in said connector, wherein a projection portion is formed along an open end surface of said case and abuts a first end surface of said cap, wherein said cap is secured fixedly to said case after said projection portion is melted.