Patent ID: 6895664

Claim:
A manufacturing method of an optical coupling device, using a lead frame, which is provided with (1) a light-emitting side section in which a plurality of header sections for mounting thereon light-emitting elements are aligned, (2) a light-receiving side section in which a plurality of header sections for mounting thereon light-receiving elements are aligned, and (3) a connecting section located between said light-emitting side section and said light-receiving side section for connecting said light-emitting side section and said light-receiving side section in parallel into one body, said method of the optical coupling device, comprising the steps of: (a) mounting said light-emitting elements and said light-receiving elements on said lead frame so as to sandwich said connecting section; and (b) folding said lead frame along said connecting section at a folding margin so that the light-emitting side section and the light-receiving side section face one another after carrying out said step (a).