| 摘要 |
PURPOSE:To estimate the amount of mercury charged in a glass bulb by cooling the glass bulb locally, during the manufacturing process, by spraying air so as to produce a black spot at a voluntary position, and reading the size, the degree of absorbance, or both the size and the degree of absorbance of the black spot. CONSTITUTION:During an exhaustion process or other process following after mercury is dropped into a lamp bulb, the surface of a glass bulb 1 for a fluorescent lamp is locally cooled by spraying air with a temperature lower than that of the wall of the glass bulb 1, such as air with room temperature, by means of an air spraying equipment 3. As the result, part of mercuric vapor filling the lamp bulb 1 is condensed on a local part of the inner wall of the glass bulb 1 so as to form a black spot 2. Thus formed black spot 2 can be visually recognized from the outside of the bulb 1, and can be satisfactorily read optically. |
