To provide a device equipped with a light source (26) for exposing a panel (20), specially, the surface (22) of a printed circuit panel.

The device is provided with two movable shutters (16A and 16B). The shutters are suitable to shield the light source, and respectively provided with edges, and a window for transmitting the light when the optical zone is formed on the panel surface is defined by the edges. Besides, the device is provided with a means (32) for moving the shutters in a plane (P) positioned between the light source and the panel, and a control means (34') for controlling the displacement of the shutter so that both shutters may pass through the panel surface in the plane P at almost the same velocity (V) and also in the same direction.