US Patent 9122025 Optical module

A prism/lens array (25) in the present invention is a grass prism having an approximately 45 degrees tapered part. A plurality of lenses (31) are provided side by side on the front surface of the prism/lens array (25). A pair of protrusions (33) are formed on both sides of lenses (31) on the surface on which the lenses (31) are provided. The protrusions (33) are formed in the top-bottom direction of the prism/lens array (25) and roughly V-shaped cross sections. Grooves (35) are provided in an inside surface of a prism-securing part (19), in areas corresponding to the protrusions (33). The grooves (35) are shaped such that the protrusions (33) can fit into the grooves; for example, the grooves could have roughly V-shaped cross sections.