| 摘要 |
An illuminator having rodlike light source lamps placed on the inner side of a light reflection plate internally having a reflector, in which illumination efficiency is enhanced by optimizing a positional relationship between the rodlike light source lamps and the reflector. In the illuminator (10) having the shade-like light reflection plate (2) that has the inner surface for reflecting light and also having the rodlike light source lamps (1) placed on the inner side of the light reflection plate (2) with the base ends of the lamps fixed to the vicinity of the top plate (2a) of the light reflection plate (2), the reflector (3) having a reflective outer surface is placed in the vicinity of the center of a top plate (2a) of the light reflection plate (2) so as to project toward the opening side of the light reflection plate (2). The projection length (d1) of the reflector (3) is set in the range of 1/3 to 3/4 the projection length (d2) of a rodlike light source lamp in the light reflection plate (2). |
