LIGHT ACTIVATED TRANSDUCER

摘要

A light-activated transducer, according to the invention comprises: a transparent electrically-insulating substrate (2) having on one surface an electrode structure comprising an electrode portion (5a) apertured for passage therethrough of light incident on a corresponding region of the substrate, a contact pad (5c) spaced from the electrode portion, and an electrical feedthrough (5b) connecting the electrode portion to the contact pad; an insulator layer (3) adhered on the said surface of the substrate and on the feedthrough, and surrounding the electrode portion while leaving uncovered the contact pad and the electrode portion and the corresponding region of the substrate; a conductive or semiconductive cover sheet (1) adhered on the insulator layer and supported thereby in spaced overlying relationship with the electrode portion and the corresponding region of the substrate and forming therewith, and with the surrounding insulator layer, a sealed cavity; and within the cavity, an ionisable gaseous filling.