| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a glass bulb in which there is no possibility that a crack or the like is formed at the end part of a glass ball of the glass bulb by inserting a leading-in wire between the base and the end part of the glass ball. <P>SOLUTION: When the glass bulb L is connected and fixed to the base 10 provided with a base shell 1 at the end part of glass 60, the end part of the glass 60 is contacted with the base shell 1 at least at one position, and its objective is to make a gap of 0.5 mm or more from the base shell 1 to become 30-50% of the whole circumference. By doing that way, because an appropriate gap is provided between the end part of the glass bulb and the base 10, when mounting the leading-in wire 4a and the base shell 1, the possibility is reduced that the crack or the like is formed at the end part of the glass bulb 60 by pressure of the lead-in wire 4a. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
