| 摘要 |
<p>PROBLEM TO BE SOLVED: To restrain fluctuations of cutoff voltage by realizing a high current density in a cathode for electron tube, and suppress changes of luminance. SOLUTION: The main component of the cathode for the electron tube is made by nickel. On a substrate which contains at least a kind of reducer, a porous metal layer is formed that has tungsten as the main component and that has the thickness of 80μm or less, and the porosity of 20 to 70%, and further an electron emission substance layer is equipped that has alkaline-earth metal oxides as the main component containing at least barium.</p> |
