PRINTING HEAD MECHANISM FOR OPTICAL PRINTER

摘要

PROBLEM TO BE SOLVED: To improve the printing accuracy and the maintenance property in a printing head mechanism for an optical printer, for developing the color by exposing a specific wavelength in a medium having a photosensitive member. SOLUTION: In a printing head mechanism for an optical printer, comprising LEDs 77R, 77G, 77B according to the colors for exposing a medium 30 (cycolor medium), and an aperture 10 disposed facing the medium with exposing holes 10e for transmitting light beams from the LEDs 77R, 77G, 77B to the medium 30 formed, projections 20A projecting toward the medium 30 with respect to opening parts 22A of the exposing hole 20e are provide on the surface of the aperture 10 facing the medium 30 such that the opening parts 22A are disposed away from the medium 30 with the projections 20A so as to prevent entrance of dusts 40 adhering on the medium 30 into the exposing holes 10e.