Photosensitive radiation tracker using plural prisms

Claim 1

RADIANT ENERGY SCANNING APPARATUS COMPRISING OPTICAL SCANNING MEANS HAVING AN AXIS AND INCLUDING FIRST AND SECOND PRISMS ROTATABLE IN SPACED PLANES PERPENDICULAR TO SAID AXIS FOR RECEIVING AND DIRECTING THE ENERGY RECEIVED FROM A REMOTE SOURCE OF RADIANT ENERGY, SAID FIRST AND SECOND PRISMS BEING POSITIONED SUCCESSIVELY IN THE PATH OF SAID RADIANT ENERGY SO THAT THE RADIATION PASSED BY SAID FIRST PRISM IS RECEIVED BY SAID SECOND PRISM, OPTICAL FOCUSING MEANS DISPOSED TO RECEIVE AND FOCUS THE RADIANT ENERGY FROM SAID FIRST AND SECOND PRISMS, MEANS RESPONSIVE TO THE OUTPUT RADIANT ENERGY OF SAID FOCUSING MEANS FOR MODULATING SAID ENERGY, RADIATION DETECTOR MEANS DISPOSED TO RECEIVE THE RADIANT ENERGY OUTPUT OF SAID MODULATING MEANS AND PRODUCE AN ELECTRIC SIGNAL, COMPUTING MEANS RESPONSIVE TO THE SIGNAL PRODUCED BY SAID DETECTOR MEANS FOR DERIVING FIRST AND SECOND ERROR CONTROL SIGNALS, FIRST AND SECOND SERVOMECHANISM DRIVE MEANS RESPONSIVE TO SAID FIRST AND SECOND ERROR SIGNALS, RESPECTIVELY, FOR INDIVIDUALLY ROTATING SAID FIRST AND SECOND PRISMS, RESPECTIVELY, THEREBY TO DIRECT SAID OPTICAL SCANNING MEANS TOWARDS SAID SOURCE OF RADIANT ENERGY.