Patent ID: 7045943

Claim:
An electron gun for a cathode ray tube comprising a cathode that emits electron beams, a first electrode that controls the electron beams emitted from the cathode, a second electrode that accelerates the electron beams emitted from the first electrode, and third to fifth electrodes sequentially arranged in a screen direction to act as pre-focus lenses, wherein the third to fifth electrodes have electron beam through holes, all of which are different in size from one another, and wherein each electron beam through hole of the third and fourth electrodes is smaller than the electron beam through hole of the fifth electrode, and the electron beam through hole of the third electrode is smaller than that of the fourth electrode, and the size of the electron beam through hole of the third electrode is greater than the size of the electron beam through hole of the fifth electrode×0.1 and less than the size of the electron beam through hole of the fifth electrode×0.5.