| 摘要 |
PURPOSE:To provide possibility of setting the illuminating condition optimum for intelligent activity for every particular case by equipping a cover with an opaque surface of substantially constant width along the axis, and thereby providing fine adjustability for the amount of cast light. CONSTITUTION:A cover 2 is equipped with an opaque surface 2 of substantially constant width along the axis. In case a sole cover 2 is fitted, the light casing condition to a specific place can be adjusted steplessly by rotating the cover 2 relative to the light source 1. In case a pair of covers 2, an inner and an outer, are fitted, fine adjustment of light projection can be made by relatively rotating them 2 or moving in the axial direction. Thus the amount of light projection and its direction can be altered steplessly, and proper adjustment can be achieved for the illuminated condition of the specified place as required so as to enable particular responses even in the illumination related closely to intelligently productive activities easily without bringing about complification of the device and system. |
