Photovoltaic device for indicating position and intensity including peripheral electrode

Claim 1

A LIGHT SENSITIVE DEVICE COMPRISING A WAFER-LIKE ELEMENT FORMED OF TWO LAYERS OF MATERIAL EACH HAVING A DIFFERENT CONDUCTIVITY CHARACTERISTIC, A PLURALITY OF SPACED ELECTRODES CONNECTED TO ONE OF SAID LAYERS, ANOTHER ELECTRODE ATTACHED TO THE OTHER LAYER AND EXTENDING AROUND THE PERIPHERY THEREOF, SAID PERIPHERAL ELECTRODE BEING LOCATED OUTWARDLY ON THE ELEMENT RELATIVE TO THE AFOREMENTIONED ELECTRODES, MEANS FOR FOCUSING A SPOT OF LIGHT ONE ONE OF SAID LAYERS IN THE REGION DEFINED WITHIN THE PERIPHERAL ELECTRODE, AND VOLTAGE SENSITIVE MEANS CONNECTED BETWEEN PRESELECTED ONES OF SAID PLURALITY OF ELECTRODES AND BETWEEN SAID PERIPHERAL ELECTRODE AND AT LEAST ONE OF SAID PLURALITY OF ELECTRODES, SAID VOLTAGE SENSITIVE MEANS RESPONDING TO VOLTAGE DIFFERENCES BETWEEN THE ASSOCIATED ELECTRODES CONNECTED THERETO IN RESPONSE TO IMPINGMENT OF SAID LIGHT SPOT ON SAID LAYER, MOVEMENT OF SAID LIGHT SPOT ON SAID ONE LAYER RESULTING IN CHANGES IN THE VOLTAGES SENSED BETWEEN SAID ELECTRODES.