| 摘要 |
PURPOSE:To decrease the temperature rise of a magnetism-focusing structure by bringing nonmagnetic spiral metallic bodies having a high thermal conductivity into contact with the outer circumference surface of the magnetism-focusing structure and metallic fixing bodies, and packing an organic solid agent into the space formed among these members to harden it. CONSTITUTION:For the purpose of preventing any mechanical positional shifts of a magnetism-focusing structure 14 and achieving thermal radiation, a plural number of nonmagnetic spiral metallic bodies 11 having a high thermal conductivity are installed in such a manner that their outer peripheries are in contact with the outer circumference surface of the magnetism-focusing structure 14 and the inner surfaces of metallic fixing bodies 9 and 10 over the entire length of the axial direction. After that an organic solid agent 13 is poured from a solid-agent-pourins hole 12 provided in the metallic fixing body 9 to fix the magnetism-focusing structure 14 and the plural number of the spiral metallic members 11. Owing to the above constitution, heat can be efficiently radiated toward the metallic fixing bodies 9 and 10 and the temperature increase of the magnetism-focusing structure 14 is decreased. As a result, the deterioration of a magnet and the disturbance of magnetic flux can be minimized, thereby stabilizing the characteristics of a tubular bulb. |
