| 摘要 |
The device has two moving shutters (16A, 16B) that mask a light source. Each shutter presents a respective edge, the edges together define a window to generate light zone on a face of a panel/PCB. A unit (32) displays the shutters in a plane lying between the source and the panel. The displacement of the shutter is controlled by a unit (34) in such a manner that the shutters move at same speed and in a same direction. |
