ProblemTo provide technology for preventing a drop in image scanning quality due to penetration of external light and contact with an ink ribbon. The reservoir has an air-pressure outlet and a reservoir outlet, the reservoir outlet being in fluid connection with the sprayer outlet. An adjusting device adjusts the position between the source, the detector and the object in order for the volume to be at different depths with a constant angle. The lanyard system also provided length and angle adjustments. Also disclosed are a curable coating composition and a coated substrate.