Storage tube having transmission target with low differential cutoff专利检索-脉冲电场电场物理专利检索查询-专利查询网

Storage tube having transmission target with low differential cutoff

阅读：27发布：2023-08-01

专利汇可以提供Storage tube having transmission target with low differential cutoff专利检索，专利查询，专利分析的服务。并且A direct viewing charge image storage tube is described including a transmission type storage target having an extremely low differential cutoff of about 0.1 to 0.2 volt and faster writing speed of about 100 to 500 centimeters per microsecond. This is achieved by employing a thick storage dielectric on the mesh electrode of the target, providing a low electrical field adjacent the rear of the target and applying a positive preparation pulse to the target electrode during bombardment by the low velocity flood electrons until the potential of such dielectric is decreased to the cutoff voltage. The side portions of the dielectric surrounding each of the mesh openings continues to charge negatively after the front surface portion of the dielectric reaches the flood gun cathode potential so that the potential of each front surface portion decreases below such cathode potential until it reaches the cutoff voltage for the adjacent mesh opening before termination of the preparation pulse. The thick storage dielectric layer may be made of low density secondary emissive, such as magnesium oxide having a density of less than about 5 percent of its bulk density. While the storage tube can contain only one transmission storage target and phosphor viewing screen, it may also employ a second transmission storage target of thinner dielectric of higher density between the first target and such phosphor screen so that a charge image formed on the first target may be transferred to such second target for storage viewing and over a longer time.，下面是Storage tube having transmission target with low differential cutoff专利的具体信息内容。

权利要求

1. A charge image storage tube apparatus in which the improvement comprises: a transmission storage target including a mesh electrode having a plurality of mesh openings therethrough and a thick storage dielectric layer provided on said mesh electrode without covering said mesh openings, said dielectric layer having a sufficient thickness to provide dielectric side portions surrounding each mesh opening which can be charged to a different potential than the front surface of said dielectric layer facing away from said mesh electrode; means for uniformly bombarding the storage dielectric with low velocity electrons emitted by a first cathode; writing means for bombarding the storage dielectric at written target areas with a writing beam of high velocity electrons emitted from a second cathode more negative than said first cathode to form a positive charge image thereon which enables the low velocity electrons to be transmitted through said written areas; field means for providing a low electrical field adjacent the rear side of said storage target away from said first cathode, said field being less than the voltage gradient produced across said dielectric layer during operation of said tube; and preparation means for applying a preparation voltage pulse to said mesh electrode prior to formation of said charge image thereon but during bombardment of the storage dielectric by the low velocity electrons, said pulse being of a sufficiently positive voltage relative to said firsT cathode to cause the storage dielectric to charge negatively to a cutoff voltage before termination of said pulse, said cutoff voltage being sufficiently more negative than said first cathode potential to stop said low velocity electrons from being transmitted through said target at the unwritten target areas.

2. A storage tube in accordance with claim 1 which includes a phosphor screen positioned on the opposite side of the transmission target from said first cathode which is a flood gun cathode, so that said low velocity electrons are transmitted through the written areas of said target to form a light image on said screen corresponding to said charge image.

3. A storage tube in accordance with claim 1 in which the storage dielectric is of a low density less than about 5 percent of its bulk density.

4. A storage tube in accordance with claim 1 in which the storage dielectric layer has a thickness of at least 5 microns.

5. A storage tube in accordance with claim 1 in which the storage dielectric layer has a thickness of about 10 to 30 microns.

6. A storage tube in accordance with claim 1 in which said field is less than about 10 percent of said voltage gradient across the dielectric layer.

7. A storage tube in accordance with claim 2 which also includes a second mesh electrode between said storage target and said phosphor screen, and said low field is between said second mesh electrode and said storage target.

8. A storage tube in accordance with claim 7 in which the second mesh electrode is part of a second transmission storage target of greater capacitance than the first mentioned target, including a second storage dielectric layer provided on said second mesh electrode, and also includes means for transferring the charge image written on the first target to said second target and for storing said charge image on said second target.

9. A storage tube in accordance with claim 8 in which the first storage dielectric layer is of greater thickness than said second dielectric layer.

10. A storage tube in accordance with claim 8 in which the first storage dielectric is of less density than said second dielectric.

11. A storage tube in accordance with claim 2 in which the phosphor screen also forms a nonmesh storage target capable of bistable storage, and also includes means for transferring the charge image written on the first target to said second target and for storing said charge image bistably on said second target.

12. A method of operating a charge image storage tube with a transmission storage target including a mesh electrode having a thick storage dielectric layer thereon in which the improvement comprises: bombarding the storage dielectric substantially uniformly with low velocity electrons emitted by a first cathode; producing a low electrical field adjacent the rear side of the storage target away from the first cathode, which is less than the voltage gradient produced across said dielectric layer; applying a preparation voltage pulse to the mesh electrode during bombardment of the storage dielectric by the low velocity electrons to prepare the target for formation of a charge image thereon, said pulse being of a sufficiently positive voltage relative to said first cathode to cause the side portions of said dielectric surrounding each target mesh opening to continue to charge negatively after the front surface of said dielectric layer reaches the first cathode potential until the potential of each front surface portion decreases to the cutoff voltage for its adjacent mesh opening before termination of said pulse, said cutoff voltage being sufficiently more negative than said first cathode potential to stop said low velocity electrons from being transmitted through said target at the unwritten target areas; and bombarding the prepared storage dielectric with a writing beam of high velocity electrons emitted by a second cathode more negative than said first cathode to form a charge iMage on written areas of said dielectric and to enable said low velocity electrons to be transmitted through said written areas.

13. A method in accordance with claim 12 in which the storage tube includes a phosphor screen and the low velocity electrons are transmitted through the written areas of the storage target to the phosphor screen to produce a light image corresponding to said charge image.

14. A method in accordance with claim 11 in which the storage tube includes a second transmission storage target and the charge image is transferred from the first target to said second target by the low velocity electrons transmitted through the written areas of said first target.

15. A method in accordance with claim 14 in which the charge image is stored for a longer time on said second target than on said first target.

16. A method in accordance with claim 15 in which the charge image is stored bistably on the second target and the low velocity electrons are transmitted through said second target to a phosphor screen in order to produce the corresponding light image on the phosphor screen.

17. A method in accordance with claim 14 in which said low electrical field is produced between the first and second storage targets and has a value of less than about 10 percent of the voltage gradient across the first storage dielectric.

18. A method in accordance with claim 12 in which the storage dielectric has a thickness greater than about 5 microns.

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Storage tube having transmission target with low differential cutoff

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