Optical sensor including shortcircuit protection having notched electrode regions

摘要

In an optical sensor, there is a risk that a short-circuit occurs in a gap between opposite electrodes on a photoconductive body. A pair of band-shaped electrodes each having a width of "W" are formed on the photoconductive body under the condition that these electrodes are positioned opposite to each other via the gap having an interval of "L". A band-shaped first notch portion having a length of "W/2" and a width of "L" is formed which is opened to the gap. Furthermore, a second notch portion is formed which is closed other than the portion thereof communicated to the first notch portion. Thus, first and second bridge portions are formed in one electrode where the first and second notch portions have been formed. When the opposite electrodes are shortcircuited, one of these bridge portions is cut out so that the tip portion of the cut electrode functions as another electrode.