| 摘要 |
An electron emitting source 6 is covered with a cathode mask 20 whose opening areas are substantially the same as those in a grid electrode 10, so that the areas for which the electrons are emitted from the electron emitting source 6 can substantially be the same as the opening areas in the grid electrode 10. Thus, substantially all the electrons emitted from these areas can be ensured to pass through opening portions 11 in the grid electrode 10 so as to be effective electrons that can contribute to light emission. In this way, power loss at the grid electrode 10 can be reduced. At the same time, harmful metallic sputtering caused at the grid electrode 10 toward a cathode electrode 5 can be reliably prevented, whereby damages on the cathode electrode can be avoided.
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