| 摘要 |
In an electron gun of a cathode ray tube of the type comprising a cathode electrode for emitting an electron beam, a first grid electrode for focusing the electron beam and a second grid electrode for accelerating the electron beam, the cathode surface which emits the electron beam is a concaved surface which creates different electron beam focusing effects in two orthogonal directions and the first grid electrode comprises a flat plate having an elongated iris opening with its major axis coincided with the direction of the cathode surface in which the focusing effect is strong and the minor axis coincided with the direction of the cathode surface in which the focusing effect is weak.
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