| 摘要 |
<p>A method for manufacturing an inexpensive lamp, which suppresses distortion of a bulb and prevents decrease in commercial value and breakage of the bulb. In a glass bulb (6) having one end thereof communicating with an exhaust tube (5), an assembly of a filament (2), metal foils (3) and lead wires (4) is disposed. In this state, the whole glass bulb (6) is heated by a burner (7). The end opposite to the exhaust tube (5) of the glass bulb (6) is pinch-sealed to form a pinch-sealed portion (1d). Subsequently, an expanded portion (1b) is formed by charging a protective gas from the exhaust tube (5) into the glass bulb (6). <IMAGE></p> |
