Device for producing halftone patterns

Claim 1

A DEVICE FOR PRODUCING HALFTONE PATTERNS, COMPRISING A SUPPORT, FIRST MOUNTING MEANS FOR FIXEDLY HOLDING AN ORIGINAL ON SAID SUPPORT, SECOND MOUNTING MEANS FOR FIXEDLY HOLDING A RECORDING BLANK ON SAID SUPPORT, SAID ORIGINAL BEING SO POSITIONABLE ON SAID FIRST MOUNTING MEANS AS TO BE SCANNABLE BY A MOTION PARALLEL TO THE SURFACE OF SAID BLANK, A CARRIAGE DISPLACEABLE ON SAID SUPPORT IN A FIRST DIRECTION AND IN A SUBSTANTIALLY PERPENDICULAR SECOND DIRECTION BOTH PARALLEL TO SAID SURFACE, PHOTOELECTRIC SENSING MEANS FIXEDLY MOUNTED ON SAID CARRIAGE FOR SCANNING SAID ORIGINAL, RECORDING MEANS POSITIONED ON SAID CARRIAGE AT A FIXED LOCATION THEREOF IN PROXIMITY TO SAID SURFACE WITH FREEDOM OF RELATIVE TRANSVERSE DISPLACEMENT FOR MARKING SAID BLANK, FIRST DRIVE MEANS FOR RECIPROCATING SAID CARRIAGE IN SAID FIRST DIRECTION, SECOND DRIVE MEANS SYNCHRONIZED WITH SAID FIRST DRIVE MEANS FOR INTERMITTENTLY ADVANCING SAID CARRIAGE IN SAID SECOND DIRECTION BETWEEN RECIPROCATIONS OF SAID FIRST DRIVE MEANS, TRANSMISSION MEANS COUPLING SAID RECORDING MEANS WITH SAID SENSING MEANS FOR CONTROLLING THE MARKING OF SAID BLANK IN ACCORDANCE WITH THE BRIGHTNESS OF THE ORIGINAL AS SCANNED BY SAID SENSING MEANS, AND INTERRUPTER MEANS COUPLED WITH SAID FIRST DRIVE MEANS FOR PERIODICALLY INACTIVATING SAID TRANSMISSION MEANS AT A RATE WHICH IS HIGH RELATIVE TO THE RATE OF RECIPROCATION OF SAID CARRIAGE; SAID TRANSMISSION MEANS INCLUDING A FIRST AND A SECOND AMPLIFIER, SAID SENSING MEANS COMPRISING A PHOTOELECTRIC SCANNING CELL CONNECTED TO CONTROL SAID FIRST AMPLIFIER, SAID SECOND AMPLIFIER BEING CONNECTED TO A SOURCE OF REFERENCE POTENTIAL, AND AN OUTPUT CIRCUIT DIFFERENTIALLY CONNECTED ACROSS THE OUTPUTS OF SAID AMPLIFIERS, SAID FIRST AND SECOND AMPLIFIERS BEING INCLUDED IN RESPECTIVE ARMS OF A BRIDGE CIRCUIT, SAID OUTPUT CIRCUIT LYING IN AN OUTPUT DIAGONAL OF SAID BRIDGE CIRCUIT.

Claim 2

A DEVICE FOR PRODUCING HALFTONE PATTERNS, COMPRISING A SUPPORT, FIRST MOUNTING MEANS FOR FIXEDLY HOLDING AN ORIGINAL ON SAID SUPPORT, SECOND MOUNTING MEANS FOR FIXEDLY HOLDING A RECORDING BLANK ON SAID SUPPORT, SAID ORIGINAL BEING SO POSITIONABLE ON SAID FIRST MOUNTING MEANS AS TO BE SCANNABLE BY A MOTION PARALLEL TO THE SURFACE OF SAID BLANK, A CARRIAGE DISPLACEABLE ON SAID SUPPORT IN A FIRST DIRECTION AND IN A SUBSTANTIALLY PERPENDICULAR SECOND DIRECTION BOTH PARALLEL TO SAID SURFACE, PHOTOELECTRIC SENSING MEANS FIXEDLY MOUNTED ON SAID CARRIAGE FOR SCANNING SAID ORIGINAL, RECORDING MEANS POSITIONED ON SAID CARRIAGE AT A FIXED LOCATION THEREOF IN PROXIMITY TO SAID SURFACE WITH FREEDOM OF RELATIVE TRANSVERSE DISPLACEMENT FOR MARKING SAID BLANK, FIRST DRIVE MEANS FOR RECIPROCATING SAID CARRIAGE IN SAID FIRST DIRECTION, SECOND DRIVE MEANS SYNCHRONIZED WITH SAID FIRST DRIVE MEANS FOR INTERMITTENTLY ADVANCING SAID CARRIAGE IN SAID SECOND DIRECTION BETWEEN RECIPROCATIONS OF SAID FIRST DRIVE MEANS, TRANSMISSION MEANS COUPLING SAID RECORDING MEANS WITH SAID SENSING MEANS FOR CONTROLLING THE MARKING OF SAID BLANK IN ACCORDANCE WITH THE BRIGHTNESS OF THE ORIGINAL AS SCANNED BY SAID SENSING MEANS, AND INTERRUPTER MEANS COUPLED WITH SAID FIRST DRIVE MEANS FOR PERIODICALLY INACTIVATING SAID TRANSMISSION MEANS AT A RATE WHICH IS HIGH RELATIVE TO THE RATE OF RECIPROCATION OF SAID CARRIAGE; SAID TRANSMISSION MEANS INCLUDING A FIRST AND A SECOND AMPLIFIER, SAID SENSING MEANS COMPRISING A PHOTOELECTRIC SCANNING CELL CONNECTED TO CONTROL SAID FIRST AMPLIFIER, SAID SECOND AMPLIFIER BEING CONNECTED TO A SOURCE OF REFERENCE POTENTIAL, AND AN OUTPUT CIRCUIT DIFFERENTIALLY CONNECTED ACROSS THE OUTPUTS OF SAID AMPLIFIERS, SAID FIRST AND SECOND AMPLIFIERS BEING INCLUDED IN RESPECTIVE ARMS OF A BRIDGE CIRCUIT, SAID OUTPUT CIRCUIT LYING IN AN OUTPUT DIAGONAL OF SAID BRIDGE CIRCUIT.