Browse Prior Art Database

Photostorage System

IP.com Disclosure Number: IPCOM000097280D
Original Publication Date: 1962-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Schaffert, RM: AUTHOR

Abstract

Multi layer photostorage element 10 has a transparent substrate 12, the faceplate of cathode ray tube 14. A transparent conductive surface 15 is deposited on substrate 12. A layer 16 of ferroelectric material, such as ammonium dihydrogen phosphate, is deposited on the surface 15. Layer 17 of photoconductive material, is deposited on layer 16. The photoconductive layer 17 is made of anthracene, polyvinylcarbazole or a thin layer of zinc sulphide. Element 10 is completed by a transparent conductive surface 18, deposited on photoconductive layer 17. A layer of cathodoluminescent material 20, preferably light transmitting, is arranged on conductive surface 18.

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Photostorage System

Multi layer photostorage element 10 has a transparent substrate 12, the faceplate of cathode ray tube 14. A transparent conductive surface 15 is deposited on substrate 12. A layer 16 of ferroelectric material, such as ammonium dihydrogen phosphate, is deposited on the surface 15. Layer 17 of photoconductive material, is deposited on layer 16. The photoconductive layer 17 is made of anthracene, polyvinylcarbazole or a thin layer of zinc sulphide. Element 10 is completed by a transparent conductive surface 18, deposited on photoconductive layer 17. A layer of cathodoluminescent material 20, preferably light transmitting, is arranged on conductive surface 18.

Element 10 is normalized by applying direct potential, from source 26 through switch 28 in normalizing position N, between the conductive surfaces 15 and 18 and flooding the photoconductive layer 17 with light. This is effected by modulating the electron beam 30 of tube 14 with relatively high current to produce a bright raster of uniform light intensity in material 20. This action switches the entire ferroelectric layer 16 to one direction of polarization. The direct potential from source 26 is then reversed by means of switch 28 in the recording position R. This is for establishing a polarized image in element 10 by Modulating beam 30 with current varying in intensity in proportion to the light values of the image, as from a source 32. Beam 30 produces luminescent patterns in layer 20 corresponding to the image source. These light patterns impinging on layer 17 cause areas of layer 16 corresponding to the light pattern to be switched to the opposite direction of polarizatio...