| 摘要 |
PURPOSE:To give a high slit surface illuminance and a light distribution characteristic which scarcely has an uneven illuminance by constituting so that bulb surfaces of a side for illuminating a slit by a direct projecting light, and a reflector surface side for illuminating a slit by a reflected light by the first reflector become a frosted surface, respectively, and other bulb surface becomes a clear surface. CONSTITUTION:When a bulb surface of a side which faces a slit P of a hologen electric lamp 1 and a reflecting surface 2a of a reflector 2 is made a frosted surface 8, a slit surface illuminance distribution being approximate to a light distribution characteristic of a frost type halogen electric lamp is obtained by illuminating lights F0, F1, respectively. On the other hand, as for a light F2 reflected twice by a reflecting surface 2b and a reflector 3, since an illuminance distribution on the slit surface is equalized by the light distribution characteristic of the halogen electric lamp 1 itself, an uneven illuminance of the slit surface becomes extremely small even if a bulb surface of a side facing it is made a clear surface 9. Also, in case when a bulb surface of a reflecting surface 2c side is made the clear surface 9, the greater part of a light F3 radiated from a filament 7 is returned to the filament 7 side, brightness of the frosted surface 8 is increased, the frosted surface 8 becomes the secondary light source, and the slit surface illuminance is increased. |
