Optical sound recording and reproduction

Claim 1

APPARATUS FOR MAKING A PHOTOGRAPHIC RECORDING OF SOUND COMPRISING A STYLUS HAVING A MAIN SUPPORTING BODY PART, AN ARRAY OF LONG AND THIN OPTICAL FIBERS EXTENDING THROUGH SAID BODY PART WITH CORRESPONDING FIRST ENDS OF SAID FIBERS EXPOSED AND ARRANGED CONTIGUOUSLY IN A ROW, SAID FIBERS EACH BEING OF A CROSS-SECTIONAL SIZE SMALLER THAN THE RESOLUTION DESIRED OF SAID RECORDING AND EMBODYING A CORE SECTION OF LIGHT-CONDUCTING MATERIAL HAVING A RELATIVELY HIGH INDEX OF REFRACTION SURROUNDED BY A RELATIVELY THIN CLADDING OF MATERIAL HAVING A LOWER INDEX OF REFRACTION THAN SAID CORE, CORRESPONDING OPPOSITE ENDS OF SAID FIBERS BEING ARRANGED SUBSTANTIALLY IN THE SAME GEOMETRICAL ORDER AS SAID FIRST ENDS THEREOF, MEANS FOR PRODUCING A LINE OF LIGHT ALONG THE LENGTH OF ROW OF SAID OPPOSITE ENDS OF SAID FIBERS, MEANS FOR VARYING THE LENGTH OF SAID LINE IN ACCORDANCE WITH THE INSTANTANEOUS AMPLITUDE OF A SOUND WAVE TO BE RECORDED, A LIGHT SENSITIVE MEDIUM ADJACENT THE SAID FIRST ENDS OF SAID ARRAY AT SAID STYLUS AND MEANS FOR PROVIDING RELATIVE MOTION BETWEEN SAID STYLUS AND SAID MEDIUM ALONG A LINE TRANSVERSE TO THE LENGTH OF SAID ARRAY.