Non-storage electron multiplier operation of transmission storage tube专利检索-图像对比度图形技术专利检索查询-专利查询网

Non-storage electron multiplier operation of transmission storage tube

阅读：232发布：2022-01-06

专利汇可以提供Non-storage electron multiplier operation of transmission storage tube专利检索，专利查询，专利分析的服务。并且A method and apparatus is described for providing non-storage electron multiplier operation of transmission storage tubes and other cathode ray tubes employing a transmission mesh target and a separate phosphor screen spaced therefrom. The improved operation is achieved by bombarding the dielectric layer on the mesh target electrode with low velocity flood electrons to charge such dielectric to a negative voltage with respect to the target electrode, thereafter bombarding the charged dielectric with a beam of high velocity writing electrons having energies greater than the first crossover potential to cause secondary electron emission at a greater than unity ratio to provide electron multiplication and attracting the secondary electrons through the mesh openings of the target electrode to the phosphor screen. The flood electron gun may be turned off during writing so that the flood electrons do not strike the phosphor screen in order to provide better image contrast. This electron multiplication increases the current of the electron beam striking the phosphor screen and thereby increases the maximum nonstored writing speed and the brightness of the light image.，下面是Non-storage electron multiplier operation of transmission storage tube专利的具体信息内容。

权利要求

1. A method of operation of a cathode ray tube having a phosphor screen and a separate electron transmission target including a mesh electrode and a dielectric layer provided on the mesh electrode without covering its mesh openings, to provide faster nonstored writing speed in which the improvement comprises: charging the target dielectric substantially uniformly so that the exposed surface of said dielectric is charged to a negative voltage with respect to the potential of said mesh electrode; bombarding said charged dielectric with high velocity writing electrons to cause secondary electrons to be emitted by said dielectric, said writing electrons having energies above the first crossover potential of said dielectric so that its secondary electron emission ratio is greater than unity; and attracting said secondary electrons through the openings of said mesh electrode to cause them to bombard the phosphor screen positioned on the opposite side of said target from the source of said writing electrons and spaced from said target to produce a light image on said screen so that said target operates as an electron multiplier.

2. A method in accordance with claim 1 in which the tube is a direct view transmission storage tube, said charging is achieved by bombardment of the dielectric with low velocity flood electrons and also includes preventing said flood electrons from being transmitted through said target mesh electrode during the production of said light image.

3. A method in accordance with claim 2 in which the source of said flood electrons is cut off when the writing electrons strike said dielectric.

4. A method in accordance with claim 1 in which the secondary electrons are accelerated through a high electrical field between said target and said phosphor screen.

5. A method in accordance with claim 1 in which the writing electrons are provided by an electron beam which is deflected to form the light image.

6. A method in accordance with claim 2 in which the tube is a transmission storage tube which also includes a collector mesh electrode positioned on the opposite side of said target from the phosphor screen, and the negative voltage on the surface of said charged dielectric produces a sufficient voltage gradient across the dielectric layer to attract the secondary electrons through the target mesh electrode toward said screen and away from said collector electrode.

7. A cathode ray tube apparatus in which the improvement comprises: an electron transmission target including a target mesh electrode and a dielectric layer provided on said target electrode without covering its mesh openings; charging means for charging the target dielectric substantially uniformly so that the exposed surface of said dielectric is charged to a negative voltage with respect to the potential of said target electrode; writing means for bombarding said charged dielectric with high velocity writing electrons to cause secondary electrons to be emitted by said dielectric, said writing electrons having energies above the first crossover potential of said dielectric so that its secondary electron emission ratio is greater than unity; a phosphor screen provided on the opposite side of said target from said writing means and spaced from said target; and field means for attracting said secondary electrons through the mesh openings of said target electrode to said phosphor screen to produce a light image on said screen so that said target operates as an electron multiplier.

8. An apparatus in accordance with claim 7 in which the charging means includes a flood gun means for bombarding the dielectric with low velocity flood electrons and also includes means for cutting off the flood gun means to prevent the emission of flood electrons during the formation of said light image.

9. An apparatus in accordance with claim 7 in which the writing means includes a writing gun for producing a beam of said writing electrons and deflection means for deflecting said beam horizontally and vertically to form the light image.

10. An apparatus in accordance with claim 7 in which the tube is a direct view transmission storage tube, the charging means is a flood gun means for bombarding the dielectric with low velocity flood electrons, and which also includes a collector mesh electrode, and voltage means for providing said storage tube with a nonstorage mode of operation in which the flood electrons are prevented from being transmitted through the target mesh electrode to the phosphor screen during the formation of said light image, and the secondary electrons are attracted through said target mesh electrode to the phosphor screen and away from the collector electrode.

11. An apparatus in accordance with claim 7 in which the tube is a direct view transmission storage tube and the charging means includes a flood gun means for bombarding the dielectric with low velocity electrons.

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Non-storage electron multiplier operation of transmission storage tube

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