| 摘要 |
PURPOSE:To improve cooling efficiency while unifying distribution of X-ray intensity and the size of an apparent focal point by making the heat radiation part formed on one part of an envelope to face the base of a disc target in the vicinity thereof. CONSTITUTION:A metal 16 is arranged to face the upper base side of a target 11 in the vicinity thereof, while the metal 15 also is arranged near the lower base side of the target 11. A cathode part 20 having a filament 19 is mounted on the part of a ceramic 17 so as to face a V groove 12, while thermoelectrons emitted from the filament 19 collide with the V groove 12 so as to form a focal point 21 on both sides of said V groove 12 for emitting X-rays from said focal point 21. Thereby, the heat radiated from the target 11 is emitted outside through the parts of metalls 15 and 16 of the envelope 18, while the parts of said metals 15 and 16 are arranged close and in opposition to the wide range of the base of the target 11 so as to raise efficiency of emitting radiant heat. |
