| 摘要 |
PURPOSE:To obtain high strength by shaping positioning members for a secondary image forming lens and a holding member so that an adhesive is easy to flow and making the positioning parts serve as adhesion parts. CONSTITUTION:A holder 15 and the secondary image forming lens 12 are positioned by adhering positioning pins 12A and 12B projecting from the secondary image forming lens in positioning holes 15a and 15b of the holder. Namely, the positioning holes 15a and 15b position the positioning pins 12A and 12B in directions A-A' and B-B' respectively; and flow grooves Ca and Cb, and Da and Db for the adhesive are provided in directions other than the positioning directions and positioning in those grooves is performed. Thus, the flow grooves Ca and Cb, and Da and Db for the adhesive are formed at the peripheries of the positioning holes 15a and 15b, so the adhesive stays there and the adhesive strength of the two positioning parts can be improved. |
