Patent ID: 7358535
Filing Date: 2008-04-15
Classification: H01L

Abstract:
1. A photo-coupler semiconductor device comprising: first and second planar lead frames each having a main portion and a distal portion; a light emitting element and a light receiving element respectively mounted on upper surfaces of the distal portions of the first and second lead frames; a light-transmitting resin member which covers the light emitting element and the light receiving element, and supports the distal portions of the first and second lead frames on the lower surfaces of the distal portions, with the light emitting element and the light receiving element being mounted on the upper surfaces opposite of the respective lower surfaces of the distal portions and the main portions of the first and second lead frames being located in coplanar relation; and a opaque resin member which covers the light-transmitting resin member, and supports the main portions of the first and second lead frames; wherein the light-transmitting resin member and the opaque resin member are each composed of an epoxy resin as a base resin, wherein the distal portion mounted with the light emitting element is inclined downward at an angle a with respect to the respective main portion, and the distal portion mounted with the light receiving element is inclined downward at an angle b with respect to the respective main portion, wherein the angles a and b satisfy the following expressions: