System for producing variable frequency signals representing a pattern tracing

Claim 1

A DEVICE FOR AUTOMATICALLY OBTAINING, FOR ALL THE POINTS, SUCCESSIVELY, OF A GIVEN CURVE TRACED ON THE PLANE SURFACE OF A MEMBER, CURRENTS PROPORTIONAL RESPECTIVELY TO THE COMPONENTS OF THE TANGENT TO SAID CURVE AT SAID POINTS, WHICH DEVICE COMPRISES, IN COMBINATION, MEANS ADAPTED TO BE ACTUATED BY AN OPERATOR FOR PROJECTING A LIGHT SPOT ONTO SAID CURVE, TWO CAMERAS FIXED ABOVE SAID SURFACE, EACH OF SAID CAMERAS COMPRISING A LENS ABOVE SAID AN IMAGE OF SAID SPOT IN AN IMAGE PLANE FIXED WITH RESPECT TO SAID CAMERA, SAID IMAGE PLANE BEING PARALLEL TO SAID PLANE SURFACE, A FLAT PHOTO-ELECTRIC CELL HAVING ITS SURFACE LOCATED IN SAID IMAGE PLANE, ELECTRIC MEANS OPERATIVE BY SAID CELL FOR PRODUCING AN ELECTRIC CURRENT IN RESPONSE TO THE ILLUMINATION OF A POINT OF SAID CELL BY AN IMAGE FORMED ON SAID CELL OF THE LIGHT SPOT ON SAID PLANE SURFACE, AN ENDLESS BAND OF A TRANSPARENT MATERIAL MOVABLE IN SAID CAMERA, A PORTION OF SAID ENDLESS BAND BEING INTERPOSED BETWEEN SAID LENS AND SAID PHOTOELECTRIC CELL AND BEING PARALLEL THERETO, AND ELECTRIC MOTOR MEANS FOR DRIVING SAID ENDLESS BAND AT A CONSTANT SPEED, SAID BAND BEING PROVIDED WITH A MULTIPLICITY OF EQUIDISTANT OPAQUE LINES, TRANSVERSE TO THE DIRECTION OF MOVEMENT OF SAID BAND, WHEREBY, IN RESPONSE TO THE PROJECTION ON SAID BAND PORTION OF A LIGHT SPOT HAVING NO DISPLACEMENT TRANSVERSE TO SAID OPAQUE LINES, A CURRENT OF FIXED FREQUENCY IS DELIVERED BY SAID ELECTRIC MEANS BUT THE PROJECTION ON SAID BAND PORTION OF A LIGHT SPOT HAVING DISPLACEMENTS TRANSVERSE TO SAID OPAQUE LINES CAUSES SAID ELECTRIC MEANS TO DELIVER CURRENT OF VARYING FREQUENCY, THE RESPECTIVE DIRECTIONS OF MOVEMENT OF SAID ENDLESS BAND PORTIONS OF SAID TWO CAMERAS BEING AT RIGHT ANGLES TO EACH OTHER, MEANS OPERATIVE RESPECTIVELY BY THE VARIABLE FREQUENCY CURRENTS PRODUCED BY SAID ELECTRIC MEANS, RESPECTIVELY, FOR DELIVERING CURRENTS PROPORTIONAL, AT ANY TIME, TO THE FREQUENCIES AT SAID TIME OF SAID VARIABLE FREQUENCY CURRENTS.

Claim 2

A DEVICE FOR AUTOMATICALLY OBTAINING, FOR ALL THE POINTS, SUCCESSIVELY, OF A GIVEN CURVE TRACED ON THE PLANE SURFACE OF A MEMBER, CURRENTS PROPORTIONAL RESPECTIVELY TO THE COMPONENTS OF THE TANGENT TO SAID CURVE AT SAID POINTS, WHICH DEVICE COMPRISES, IN COMBINATION, MEANS ADAPTED TO BE ACTUATED BY AN OPERATOR FOR PROJECTING A LIGHT SPOT ONTO SAID CURVE, TWO CAMERAS FIXED ABOVE SAID SURFACE, EACH OF SAID CAMERAS COMPRISING A LENS ABOVE SAID AN IMAGE OF SAID SPOT IN AN IMAGE PLANE FIXED WITH RESPECT TO SAID CAMERA, SAID IMAGE PLANE BEING PARALLEL TO SAID PLANE SURFACE, A FLAT PHOTO-ELECTRIC CELL HAVING ITS SURFACE LOCATED IN SAID IMAGE PLANE, ELECTRIC MEANS OPERATIVE BY SAID CELL FOR PRODUCING AN ELECTRIC CURRENT IN RESPONSE TO THE ILLUMINATION OF A POINT OF SAID CELL BY AN IMAGE FORMED ON SAID CELL OF THE LIGHT SPOT ON SAID PLANE SURFACE, AN ENDLESS BAND OF A TRANSPARENT MATERIAL MOVABLE IN SAID CAMERA, A PORTION OF SAID ENDLESS BAND BEING INTERPOSED BETWEEN SAID LENS AND SAID PHOTOELECTRIC CELL AND BEING PARALLEL THERETO, AND ELECTRIC MOTOR MEANS FOR DRIVING SAID ENDLESS BAND AT A CONSTANT SPEED, SAID BAND BEING PROVIDED WITH A MULTIPLICITY OF EQUIDISTANT OPAQUE LINES, TRANSVERSE TO THE DIRECTION OF MOVEMENT OF SAID BAND, WHEREBY, IN RESPONSE TO THE PROJECTION ON SAID BAND PORTION OF A LIGHT SPOT HAVING NO DISPLACEMENT TRANSVERSE TO SAID OPAQUE LINES, A CURRENT OF FIXED FREQUENCY IS DELIVERED BY SAID ELECTRIC MEANS BUT THE PROJECTION ON SAID BAND PORTION OF A LIGHT SPOT HAVING DISPLACEMENTS TRANSVERSE TO SAID OPAQUE LINES CAUSES SAID ELECTRIC MEANS TO DELIVER CURRENT OF VARYING FREQUENCY, THE RESPECTIVE DIRECTIONS OF MOVEMENT OF SAID ENDLESS BAND PORTIONS OF SAID TWO CAMERAS BEING AT RIGHT ANGLES TO EACH OTHER, MEANS OPERATIVE RESPECTIVELY BY THE VARIABLE FREQUENCY CURRENTS PRODUCED BY SAID ELECTRIC MEANS, RESPECTIVELY, FOR DELIVERING CURRENTS PROPORTIONAL, AT ANY TIME, TO THE FREQUENCIES AT SAID TIME OF SAID VARIABLE FREQUENCY CURRENTS.