Patent ID: 7596289

Claim:
An optical/electrical hybrid substrate comprising: a wiring board having wirings and vias disposed in the wiring board; an optical waveguide including an optical waveguide body having a first clad layer, a second clad layer and a core portion disposed between the first clad layer and the second clad layer and provided on the wiring board, and a pair of mirrors for reflecting a light signal; a first wiring pattern for electrically connecting a terminal of a light emitting device for irradiating the light signal to a wiring and via in the wiring board; and a second wiring pattern for electrically connecting a terminal of a light receiving device for receiving the light signal to another wiring and via disposed in the wiring board, wherein the first and second wiring patterns are disposed in the optical waveguide body, the first wiring pattern has a first pad provided in the second clad layer and connected to the terminal of the light emitting device, a first via provided in the first clad layer, and a first connecting portion for electrically connecting the first pad to the first via, the second wiring pattern has a second pad provided in the second clad layer and connected to the terminal of the light receiving device, a second via provided in the first clad layer, and a second connecting portion for electrically connecting the second pad to the second via, and thicknesses of the first and second connecting portions are set to be almost equal to a thickness of the core portion, and the first and second connecting portions are disposed on a level that is even with a surface on which the core portion is provided.