| 摘要 |
PURPOSE:To easily make a double-U-shaped bulb by forming openings in ends of a pair of U-shaped glass bulbs opposite to their other ends which are sealed by stems having electrodes and joining the openings together to form a discharge path. CONSTITUTION:Phosphor films are formed on the inner surfaces of a pair of U-shaped glass bulbs 1 and 2. Ends of the bulbs 1 and 2 are closed and their other ends are sealed by stems 5 and 6 having electrodes 3 and 4 respectively. Next, after an opening is formed near each of the two closed ends, a discharge path connection part 7 is used to fuse the openings forming a continuous discharge path, thereby making a double-U-shaped discharge path, thereby making a double-U-shaped fluorescent lamp which is used to produce an incandescent- lamp type fluorescent lamp device. Since it is not necessary to curve the glass bulbs 1 and 2 after phosphor application, the thickness of the phosphor films can be made uniform and any nonuniform thickness of the glass bulbs 1 and 2 can be prevented.
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