| 摘要 |
PURPOSE:To eliminate the uneven quantity of light in the slit part of a lamp in an office machine such as a copying machine by constituting the slit part in such a way that diffusion transmission takes place in the part facing to the light emitting part of a filament in the pipe wall part on the slit side of the lamp and that diffusion reflection takes place on the opposite side. CONSTITUTION:The wall of the glass tube in a glass tube part 14a facing to a slit part 11 is subjected to a diffusion transmission treatment and the glass tube part 14b on the opposite side is subjected to a diffusion reflection treatment. If the part 14a is subjected to the diffusion transmission treatment, the image of a filament 13 increases apparently its size and the apparent length in a light emitting part 13F increases, resulting in decreased uneven quantity of light in the longitudinal direction a-b in the slit part 11. If the part 14b is subjected to the diffusion reflection treatment, a fresh secondary light source is generated in the part of the non-light emitting part 13E of the filament and there is a high effect of decreasing the uneven quantity of light in the longitudinal direction in the slit part 11. |
