Image reading apparatus comprising first and second substrates separated at a fixed distance

An image reading apparatus, comprising a photosensor for receiving light from an original document at a predetermined position relative to said photosensor, a wiring section for use in driving said photosensor, a circuit for driving said photosensor and for processing an output signal from said photosensor, a first substrate supporting said circuit, substrate means supporting said photosensor and said wiring section a base fixedly supporting said substrate means, a cap supporting said substrate at a position such that said substrate means is between said substrate and the predetermined position, and a flexible electrical connector electrically connecting said photosensor with said circuit;

• said cap, said base and said connector being so structured and arranged as to permit assembly of said apparatus by fixing said substrate to said cap, said substrate means and said connector to said photosensor and said circuit and thereafter putting said cap in place in contact with said base and fixing said cap and said base relative to each other.