Patent ID: 8695199

Claim:
A method of manufacturing a molded product of an image sensor unit comprising a molded product having a substantially rectangular parallelepiped outer shape and incorporating a substrate on which photoelectric conversion elements are arranged in line, wherein the photoelectric conversion elements convert an image focused of a reflected light from an original by a lens array into an electric signal, the method comprising the steps of: forming a frame on the molded product to surround a periphery of the substrate; forming a plurality of caulking projections configured to be bent in order to fix the substrate to the frame, the plurality of caulking projections being formed in a substantially linear arrangement on an upper surface of the frame in a longitudinal direction, each caulking projection having (i) proximal portions on the frame and (ii) being arranged at a predetermined interval from each other; forming a plurality of antiwarping grooves on the upper surface of the frame, the plurality of antiwarping grooves configured to prevent warping of the frame upon bending the caulking projections, each antiwarping groove being proximate to one of the caulking projections but arranged apart from the respective proximal portion of each caulking projection; fitting the substrate to be fixed in the frame of the molded product; and bending the caulking projections by heat and pressure to fix the substrate in the frame.