| 摘要 |
PURPOSE:To enable information to be transferred smoothly between electronic devices or between functional parts within a device, by providing a plurality of circuits, a plurality of light sources having different wavelengths, and light- receiving sections and photoelectric converting sections belonging to the respective circuits and arranged corresponding to the respective wavelengths. CONSTITUTION:Optical signal generators 10 and 11 belonging to a circuit 7 are provided by a layered structure of materials having different energy gaps. The layer 10 is made thicker than the layer 11. Consequently, the region 10 produces a narrower energy gap than the region 11 and the region 10 generates a longer wavelength while the region 11 generates a shorter wavelength. Light transmission paths 12 and 13 are also provided by a layered structure of differ ent materials, and the thicknesses of the layers are selected such that the layer 12 has a wider energy gap than the layer 13. If the optical signal generator 10 is driven, a signal is sent to a circuit 9. If the optical signal generator 11 is driven, on the contrary, the signal is sent to a circuit 8. Thus digital signals also can be transmitted by turning the optical signal generators ON and OFF. In this manner, information can be transferred very smoothly within the elec tronic device. |
