Reversible film-viewing apparatus

Claim 1

A REVERSIBLE FILM-VIEWING APPARATUS CAPABLE OF REVERSELY INTENSIFYING IMAGE OF NEGATIVE FILMS, WHICH COMPRISES AN IMAGE CONVERTING PANEL CONSISTING OF A GLASS PLATE, A FIRST TRANSPARENT ELECTRODE ON SAID GLASS PLATE, AN ELECTROLUMINESCENT LAYER HAVING AN ELECTROLUMINESCENT MATERIAL ON SAID FIRST TRANSPARENT ELECTRODE, A REFLECTIVE LAYER ON SAID ELECTROLUMINESCENT LAYER, AN OPAQUE LAYER ON SAID REFLECTIVE LAYER, A PHOTOCONDUCTIVE LAYER CONTAINING PHOTOCONDUCTIVE MATERIAL ON SAID OPAQUE LAYER, A PARALLEL GRID ELECTRODE EMBEDDED IN SAID PHOTOCONDUCTIVE LAYER. A TRANSPARENT DIELECTRIC LAYER HAVING A TRANSPARENT FILM THEREON ON SAID PHOTOCONDUCTIVE LAYER, SECOND TRANSPARENT ELECTRODE ON SAID DIELECTRIC LAYER AND A SECOND GLASS PLATE; A LIGHT SOURCE HAVING A LIGHT INTENSITY CONTROLLER; AND OPTICAL MEANS RECEIVING LIGHT FROM SAID LIGHT SOURCE AND SHINING IT THROUGH AND ENLARGING IMAGES ON A NEGATIVE FILM AND PROJECTING THE ENLARGED IMAGES ON SAID PHOTOCONDUCTIVE LAYER ON SAID PANEL THROUGH THE SECOND TRANSPARENT ELECTRODE AND THE TRANSPARENT DIELECTRIC LAYER LAYER OF SAID IMAGE CONVERTING PANEL, SAID OPTICAL MEANS, HAVING PROJECTING LENS AND THE CONDENSER LENS WHICH PASS ALL EFFECTIVE LIGHT WAVE-LENGTHS OF THE SPECTRAL RESPONSE CHARACTERISTIC OF SAID PHOTOCONDUCTIVE MATERIAL; FILM INSERTING MEANS GUIDING A FILM THROUGH SAID OPTICAL MEANS; A POWER SOURCE COUPLED TO SAID PANEL AND SUPPLYING AC VOLTAGES ACROSS SAID TWO TRANSPARENT ELECTRODES AND ACROSS SAID FIRST TRANSPARENT ELECTRODE AND SAID PARALLEL GRID ELECTRODE SO AS TO REPRODUCE IMAGES ON SAID ELECTROLUMINESCENT LAYER; AND A CONTRAST CONTROLLER IN SAID POWER SOURCE FOR ADJUSTING THE TONES OF SAID REPRODUCED IMAGES.