| 摘要 |
<p>PURPOSE:To provide a duplex tube type bulb by which work to install an inner tube in an insulating holder becomes easy and positioning of the inner tube becomes easy. CONSTITUTION:A sealing part 3 formed on one end of an inner tube 1 composed of an incandescent lamp or a discharge lamp is fixed to an insulating holder 20, and this innert tube is covered with an outer tube, and the outer tube and a base are installed in the insulating holder. A guiding groove 24 to guide one end of the inner tube and lead wires 7 derived from this is formed in the insualting holder so as to be opened only on one side surface. Thereby, since the guiding groove is formed on a side wall of the insulating holder so as to be opened only on one side surface, the inner tube and the lead wires can be inserted in the guiding groove from outside of the insulating holder, so that inserting work becomes easy.</p> |
