| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a lamp in which heating temperature at a pair of sealing tubes is made equal and deterioration of the right and left electrode is made nearly the same level, thereby improves the lamp lifetime, and its manufacturing method. <P>SOLUTION: This is the manufacturing method of a high pressure mercury lamp which comprises a high pressure mercury arc tube 10 and a reflector 20 and in which the high pressure mercury arc tube 10 comprises a light emitting part 11 with a nearly spherical shape, a pair of sealing tubes 12A, 13A extended from the both ends to the outside direction, and a pair of electrodes 16, 17 which are insertion arranged in the sealing tubes and of which respective tips are arranged opposed to each other in the arc tube, and in which one sealing tube 13A is fixed to the reflector 20. The outer diameter of the sealing tube 13A on the fixed side is made smaller than that of the other and the effective calorific value at the sealing tubes 12A, 13A is made equal. Therefore, the difference of temperature between the pair of sealing tubes and the electrodes become small, deterioration of both electrodes become equivalent, and the lamp failure due to deviation of electrodes is suppressed and the lamp has a longer life. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
