| 摘要 |
PURPOSE:To locally irradiate a portion to be machined with a high temperature beam so as to prevent an adverse thermal effect on portions other than the portion to be machined, and forcibly take in cooling air into a spot heater so as to prevent an increase in temperature of the whole of the spot heater. CONSTITUTION:Cooling air is forcibly taken in through an air inlet 5 formed on one side of a fan motor case 1, to be supplied into a mirror case 7 where a reflection mirror 12 is detachably fixed. A lamp base 17 having a lamp 16 is detachably held under a predetermined pressure in the reflection mirror 12 by a presser spring 18. The cooling air is introduced into a cooling passage 21 of the reflection mirror 12. The cooling passage 21 is constituted of a cooling fin 19 and the mirror case 7 each connected in the circumferential direction of the reflection mirror 12 and disposed along the vertical direction. The cooling air is adapted to cool the whole of the reflection mirror 12 through the cooling passage 21, to be discharged to a portion apart from a portion 26 to be machined through an air outlet 22. |
