| 摘要 |
PURPOSE:To attain ease of wiring design of a circuit between boards and to attain immunity to noise by replacing a part or all of wirings between printed circuit boards into an optical guide plate by optical transmission. CONSTITUTION:An electric signal from the back side of a board A100 is given to a light emitting element 310 via a terminal 111 of an electronic component 110, subjected to electrooptic conversion E/O and irradiated on the optical guide plate 200 as an optical signal. The light in a direction satisfying the condition of full reflection among radiated lights repeates full reflection on a wall of the transparent board and is transmitted in the board in every direction or in a prescribed direction. The optical signal is received by a photodetector 410 connected to an optional position of the optical guide plate 200, converted into an electric signal by optoelectric conversion O/E and given to an electronic component terminal 111' of the other board B. In using light emitting elements 310, 320, 330 irradiating the light with different wavelength distribution as the light emitting elements, the signal between specific elements only is transmitted in two ways by using photodetectors having a function passing selectively through a specific wavelength. |
