THERMALLY CAULKED COMBINED STRUCTURE, METHOD OF THERMAL CAULKING, AND IMAGE SENSOR UNIT AND IMAGE READING APPARATUS USING THE SAME

摘要

In an image reading apparatus incorporating a CIS unit warped by heat shrinkage of a thermoplastic resin molded product, the optical distances from a read line to a photoelectric conversion element in the center and the two end portions in the longitudinal direction of the photoelectric conversion element are different. A thermally caulked combined structure is obtained by fixing an object to be fixed by thermal caulking by thermally deforming a plurality of caulking projections formed in the longitudinal direction of a molded product made of a thermoplastic resin and having a rectangular parallelepiped outer shape. Antiwarping grooves ( 15 ) are formed apart from the proximal portion of each caulking projection ( 12 ) of the molded product ( 4 ) before thermal caulking so as to sandwich the projection.