JPS6477598A - Electronic board - Google Patents

Abstract

PURPOSE: To prevent the generation of the displacement of bit of an copy image formed with at least two colors, by recessing the part other than a screwing part of a mount face to a main body of a pedestal of an optical unit so that only the screwing part is kept into contact with a main body mount face, and mounting an adjustment screw for adjusting the space between the main body mount face and the face of the pedestal. CONSTITUTION: The part of a pedestal 1 excluding a contact part with a main body mount face, of a part to be fixed to the main body 35 by the screws 19 at both ends, is recessed by a proper depth, two lens blocks 2, 3 are mounted to adjust the position of CCD 13, 14, and the pedestal is mounted on a rear side plate 35 of an electronic board main body by the screws 19. The pedestal is made of a material of small thermal expansion coefficient. Further the adjustment screws 20 for adjusting the space between the pedestal 1 and the main body mount face are screwed into the screw holes at four corners of the pedestal 1, separately from the screws 19. Whereby the lens blocks can be kept in the adjusted state regardless of the curving, the change of temperature or the like of the mount part of a reading optical unit of a multicolor electronic board, and the displacement of bit can be prevented.