| 摘要 |
PROBLEM TO BE SOLVED: To provide a system and a method for attenuating brightness of a light beam while minimizing undesirable effect such as shadow and color rings caused by positional attenuation.SOLUTION: Output brightness of a lighting device is varied by chopping an output light beam so that the beam is alternately shielded and unshielded. A light shield device is rapidly moved into and out of a transmission path of the light beam. Brightness of the light beam received at a certain site is attenuated on the basis of a time amount per cycle when the light beam is shielded or when the light beam is unshielded. |
