Electrochemical device for producing a record

Abstract

Abstract AN APPARATUS FOR PRODUCING A RECORD IN THE NATURE OF A PHOTOGRAPH WHEREIN SMALL ELECTRICAL CURRENTS ARE CAUSED TO PASS THROUGH A SILVER HALIDE EMULSION OF THE TYPE NORMALLY USED IN PHOTOGRAPHIC PRINTING PAPER. THE INVENTION IS ESPECIALLY USEFUL IN PRODUCING A RECORD OF A PRESSURE PATTERN SUCH AS AN ULTRASONIC PATTERN IN A FLUID MEDIUM WHEREIN ONE SURFACE OF A PIEZOELECTRIC TRANSDUCER IS EXPOSED TO THE PRESSURE PATTERN, THAT SURFACE BEING COATED WITH A THIN LAYER OF AN ELECTRICALLY CONDUCTIVE MATERIAL. A PLANER ARRAY OF SEMICONDUCTOR DIODES IS PLACED IN A PARALLEL CONTACTING RELATIONSHIP WITH THE OTHER SURFACE OF THE PIEZOELECTRIC TRANSDUCER TO RECTIFY THE CHARGE PATTERN RESULTING FROM STRESS IN THE TRANSDUCER DUE TO THE PRESSURES APPLIED THERETO. THE RECTIFIED SIGNALS ON THE OUTPUT SIDE OF THE DIODE ARRAY ARE APPLIED TO A MAJOR FACE OF A MOISTENED LAYER OF SILVER HALIDE EMULSION OF A TYPE NORMALLY USED IN PHOTOGRAPHIC PRINTING PAPERS OR FILMS. THE BACK OF THE EMULSION SHEET IS COATED WITH, OR IS IN CONTACT WITH, AN ELECTRICALLY CONDUCTIVE SHEET WHICH IS ELECTRICALLY CONNECTED TO THE CONDUCTIVE LAYER ON THE PIEZOELECTRIC TRANSDUCER. AFTER EXPOSURE OF THE EMULSION LAYER TO CURRENTS GENERATED BY THE PIEZOELECTRIC CRYSTAL THE EMULSION IS REMOVED AND PROCESSED IN A CONVENTIONAL MANNER TO DEVELOP THE LATENT IMAGE PRODUCED THEREIN BY THE ELECTRICAL CURRENTS AND THEREBY PRODUCE A RECORD OF THE PRESSURE PATTERNS APPLIED TO THE PIEZOELECTRIC TRANSDUCER. IN THE USE OF THE APPARATUS DESCRIBED HEREIN AND IN THE METHOD OF PRODUCING THE RECORD, THE EMULSION IS SHIELDED FROM LIGHT OF A KIND WHICH WOULD PRODUCE AN IMAGE.

Inventors

• 👤 William W Lester

Bibliographic Details