Image reading device

An image reading device comprising:

• a solid-state image pick-up element adapted for receiving an image to be read and generating electric signals corresponding to the image, said solid-state image pick up element having a light receiving surface, a face opposite to said light receiving surface and a plurality of pin shaped connection terminals projecting from said face;
• an optical system for projecting the image to be read onto said solid-state image pick up element;
• a support member for supporting said solid-state image pick up element, said support member comprising means defining a first reference surface, a second reference surface and a terminal passing aperture for accepting said plural connecting terminals of said solid-state image pick up element, said solid-state image pick up element being maintained with said face in contact with said first reference surface;
• a substrate comprising means defining a third reference surface, said support member being fixed to said substrate in such a manner that said second reference surface is maintained in contact with said third reference surface;
• a printed circuit board to which are fixed said plural connecting terminals of said solid-state image pick up element passing through said terminal passing aperture of said support member and which is positioned with said support member between said solid-state image pick up element and said printed circuit board;
• and
• a fixing means for fixing said printed circuit board to said substrate, said fixing means deforming said printed circuit board, and said printed circuit board urging, by an elastic force produced by that deformation, said support member into press-contact with said third reference surface of said substrate.