| 摘要 |
PURPOSE:To secure a high-efficient light source available for an optical device, by setting the outer diameter of a glass tube to the specified size and sealing up neon into the glass tube at a specified pressure value. CONSTITUTION:A neon gas excellent in luminous efficacy for visible rays is sealed up into a glass tube for example of more than 20mm. in outer diameter and 436mm. in length, in which a filament coil electrode holding thermionic radiant substances at a pressure of more than 1 torr is sealed. With this, a neon gas discharge lamp for an optical device can be secured, which can exhibit high- efficiency at a rated lamp current of more than 0.2A. |
