Abstract: In a lead frame which has second tie bars 4a2, 4b2 in the vicinity of plastic packages 15, first notches 1 are formed along first edges of the second tie bars 4a2, 4b2 (in areas defined on both sides of the inner leads 12a, 12b and to come into contact with a punch during the tie bar cutting step). The first notches 1 prevent troubles associated with close arrangement of the second tie bars 4a2, 4b2 and the plastic packages 15. In addition, second notches 2 are provided along second edges of the second tie bars 4a2, 4b2. These second notches 2 are designed to receive the tips of outer leads 13a, 13b which extend from neighboring plastic packages 15 of the lead frames 100a, 100b.

Abstract: A lead frame of an optical coupling device of the present invention is so arranged that (a) a light-emitting side section in which a plurality of header sections for mounting thereon the light-emitting elements are aligned and (b) a light-receiving side section in which a plurality of header sections for mounting thereon the light-receiving element are aligned, and (c) a connecting section for connecting the light-emitting side section and the light-receiving side section in parallel into one body. The light-emitting side section and the light-receiving side section are integrated via a connecting section at which a V groove is formed for facilitating the folding of the lead frame. As a result, it is possible to provide a low-cost lead frame of an optical coupling device with a small number of components can be realized, in a simplified manner, and a manufacturing method of the optical coupling device.

Abstract: A photocoupler device includes a light emitting element; a monitor photodetector and an output photodetector for receiving light from the light emitting element; a primary side lead frame for mounting the light emitting element and the monitor photodetector; and a secondary side lead frame for mounting the output photodetector, wherein the light emitting element and the output photodetector are placed so as to face each other.