| 摘要 |
1,190,967. Cathode - ray storage tubes. XEROX CORP. 28 Sept., 1967 [29 Sept., 1966], No. 44133/67. Heading H1D. A cathode-ray storage tube wherein the stored information can be read non-destructively comprises a fine mesh screen 6 coated on one side with insulation 8 on which a charge pattern can be set up by a writing beam 22 and coated on the other side with a layer 10 of field-effect semi-conductor which can be scanned by a slow reading beam 42. The charge pattern on the layer 8 produces local fields which extend through the mesh 6 and vary the local conductivity of layer 10 by the field effect. The layer 10 is scanned by a constant current beam 42 which tends to charge the surface to the potential of the cathode 46; between scans the charge will leak off at a rate dependent upon the local conductivity of the layer 10, thus developing a charge pattern, and on the next scan the surface is restored to the cathode potential thereby generating an output signal across the load resistance 12. The insulation 8 may be glass, silicon monoxide or dioxide, calcium fluoride, or aluminium oxide; the semi-conductor 10 may be cadmium sulphide, antimony trisulphide, zinc oxide, calcium oxide, or lead oxide.
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