Epstein

Claim 1

A PHOTOELECTRIC TAPE READER FOR READING CODED INFORMATION FROM A TAPE HAVING A PLURALITY OF CODE CHANNELS, COMPRISING MEANS INCLUDING A LIGHT SOURCE FOR DIRECTING LIGHT RAYS TO STRIKE THE TAPE AT A PREDETERMINED ANGLE OF INCIDENCE, A LIGHT PICK-UP HEAD INCLUDING A CYLINDRICAL BODY MEMBER RIDING IN CONTACT WITH THE UPPER SURFACE OF THE TAPE, A PLURALITY OF LIGHT CHANNEL DEFINING MEANS EACH HAVING FIRST AND SECOND END PORTIONS, THE FIRST END PORTIONS BEING ORIENTED TO PASS ONLY LIGHT RAYS REFLECTED FROM THE TAPE AT A PREASSIGNED ANGLE OF REFLECTION, THUS TO PROVIDE AT THE SECOND END PORTIONS LIGHT SIGNALS RELATED TO THE INFORMATION ON THE RESPECTIVE CODE CHANNELS OF THE TAPE, A PLURALITY OF PHOTOSENSITIVE DETECTORS POSITIONED IN ALIGNMENT WITH THE SECOND END PORTIONS OF THE LIGHT CHANNEL DEFINING MEANS, AND SPACED FROM THE SECOND END PORTIONS TO DEFINE A GAP THEREBETWEEN, A ROTATING DISC DEFINING A PLURALITY OF SPACED APART LIGHT APERTURES AND EXTENDING INTO SAID GAP, TO MODULATE THE OUTPUT SIGNALS OF SAID DETECTORS AT A FREQUENCY RELATED BOTH TO THE ANGULAR VELOCITY OF THE DISC AND TO THE DISC APERTURE SPACING, A PLURALITY OF ALTERNATING CURRENT AMPLIFIER MEANS RESPECTIVELY COUPLED TO SAID DETECTORS TO AMPLIFY THE MODULATED SIGNALS, A PLURALITY OF DEMODULATOR MEANS RESPECTIVELY COUPLED TO SAID AMPLIFIER MEANS FOR DEMODULATING THE AMPLIFIED SIGNALS TO PROVIDE OUTPUT SIGNALS RELATED TO THE INFORMATION IN THE RESPECTIVE CODE CHANNELS, A FIRST TAPE GUIDE MEANS DISPOSED AT ONE SIDE OF THE PICK-UP HEAD TO CONTACT THE LOWER SURFACE OF THE TAPE, AND A SECOND TAPE GUIDE MEANS DISPOSED AT THE OTHER SIDE OF THE PICK-UP HEAD TO CONTACT THE LOWER SURFACE OF THE TAPE, PASSAGE OF THE TAPE OVER THE FIRST TAPE GUIDE MEANS, UNDER THE CYLINDRICAL BODY MEMBER OF THE PICK-UP HEAD, AND OVER THE SECOND TAPE GUIDE MEANS BEING EFFECTIVE TO SUBSTANTIALLY ELIMINATE TAPE FLUTTER AT THE POINT OF INFORMATION DETECTION.