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Cathode and its manufacture method, and kinescope using the cathode

A manufacturing method and kinescope technology, applied in cold cathode manufacturing, thermionic cathode manufacturing, electrode system manufacturing, etc., can solve the problems of loss of porous structure, difficulty in realizing electron emission, etc.

Inactive Publication Date: 2004-11-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the case of forming the electron-emitting material layer using the above-mentioned prior art, it is necessary to prepare two kinds of electron-emitting materials having different particle diameters.
On the other hand, when an electron-emitting material having an average particle diameter of 5 [μm] or less is used as the electron-emitting material constituting the upper layer of the electron-emitting material layer, there is a problem that the surface of the upper layer loses its porous structure and thus it is difficult to achieve predetermined electron emission.

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  • Cathode and its manufacture method, and kinescope using the cathode
  • Cathode and its manufacture method, and kinescope using the cathode
  • Cathode and its manufacture method, and kinescope using the cathode

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Embodiment Construction

[0030] Hereinafter, the present invention will be described in more detail using embodiments.

[0031] (first embodiment)

[0032] figure 1 (a) is a sectional view showing the cathode of the first embodiment of the present invention, figure 1 (b) is figure 1 An enlarged view of the electron-emitting material layer in (a).

[0033] Such as figure 1 Shown in (a), the cathode member of this embodiment has a metal cylindrical sleeve 1 with openings at both ends, a metal base 2 with an opening at one end and covers the opening at one end of the sleeve 1, and The electron emission material layer 3 formed on the flat part of the outer bottom surface of the metal base 2 constitutes. In addition, a heating filament not shown in the figure is inserted into the sleeve 1 .

[0034] The metal base 2 is made of a material whose main component is nickel and contains reducing elements such as silicon or magnesium, and its bottom is basically flat. The components of the electron emi...

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Abstract

This invention relates to improve flatness of an electron emitting substance layer surface, and smooth the electron emitting electric current density distribution of a cathode surface without degrading an electron emitting characteristic. The cathode is constructed of according that an electron emitting substance layer 3 is formed on a flat part of an outside bottom surface of a metallic base body 2 which is put on one opening part of a sleeve 1 of a metallic cylindrical body having opening parts on both ends and has an opening part on one end. By mechanically performing flattening processing on its surface after an electron emitting substance is sprayed on a metallic base body 2 in an electron emitting substance layer 3 formed on the metallic base body.

Description

technical field [0001] The invention relates to a cathode for a picture tube, a manufacturing method thereof, and a picture tube using the cathode. Background technique [0002] Conventionally, as a cathode for a kinescope, an oxide cathode in which an alkaline earth metal oxide such as barium, strontium, and calcium, which constitutes an electron emission material, is coated on a metal base is often used. On the other hand, as a method of covering the electron emitting material on the metal base, a method of suspending the above electron emitting material in a glue such as nitrocellulose or ethyl cellulose and spraying it on the metal base can be used. [0003] exist Figure 11 , a schematic diagram of an existing oxide cathode is shown. Such as Figure 11 As shown in (a), the cathode member is composed of a cylindrical sleeve 1 , a metal base 2 covering the opening at one end of the sleeve 1 , and an electron emission material layer 4 formed on the metal base 2 . The ele...

Claims

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Application Information

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IPC IPC(8): H01J1/20H01J1/26H01J9/04H01J29/04
CPCH01J9/042H01J1/20H01J29/48
Inventor 山内真英中川智岩井义和
Owner PANASONIC CORP