| 摘要 |
PROBLEM TO BE SOLVED: To reduce the quantity of signals when the density in an optical memory is increased, by arranging the light receiving area of a photoelectric conversion layer and an area upon which a voltage is impressed through a pair of electrodes so that the areas may become coincident with each other on the shortest route connecting the electrodes to each other. SOLUTION: In a photodetector, a photoelectric conversion layer 1 is sandwiched between electrodes 2 so that the surfaces of the layer 1 and electrodes 2 may be nearly flushed with each other with respect to incident light 3. In order to arrange the layer 1 and electrodes 2 in the above-mentioned way, both side portions of the layer 1 are cut off to a depth which is nearly equal to the thicknesses of the electrodes 2 by leaving the central part of the layer 1 by a width L", and the electrodes 2 are formed in the cut-off portions. In addition, the light projecting area 4 of the layer 1 is made to become almost coincident with the voltage impressed area shown by the lines of electric forces 5 between the electrodes 2 when a voltage is impressed upon the layer 1 through the electrodes 2. Therefore, the quantity of signals can be reduced when the density in an optical memory is increased.
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