A CCD scanner is provided with a regulating circuit, which stores electric-current set values of LED elements of respective colors. The EGF-R antagonist may be in the form of a small organic molecule, an antibody, or portion of an antibody that binds to and blocks the EGF receptor. The slider includes a heart-shape groove for guiding and limiting a movement of the slider and a bulge located at front of the heart-shape groove.