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US 4,556,818 AGranted
Insulating crystals for coating on a metal mesh of a storage tube
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorLyuji Ozawa
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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorLyuji Ozawa
Estimating the term…
Insulating crystals are coated on a metal mesh of a storage tube and give rise to a hysteresis effect with respect to the passage of flood electrons through the metal mesh, the hysteresis effect being caused by the persistent polarization of the insulating crystals when an electric field has been applied and the depolarization of the crystals due to the irradiation of an electron beam having an energy which is large enough to penetrate through the negative field produced by the persistent polarization. The clean surface of the insulating crystals, which contains recombination centers of electrons and holes and the deep traps of electrons and holes, is an essential feature of the insulating crystals and are necessary for the hysteresis effect with respect to the passage of the flood electrons through the metal mesh.
Insulating crystals which are coated on a metal mesh of a storage tube having a voltage means for creating an electric field therein, said crystals controlling the flow of flood electrons passing through said metal mesh and exhibiting a hysteresis effect with respect to said passage of flood electrons through said metal mesh, wherein said crystals have a clean surface, contain recombination centers of mobile electrons and holes which are generated therein by the irradiation of an electron beam thereon, and exhibit a persistent polarization when said electric field created by said voltage means has been applied across said crystals, and wherein said persistent polarization is depolarized when said persistently polarized crystals are irradiated by a writing electron beam.
Dependencies are inferred from the claim text.