| 摘要 |
PROBLEM TO BE SOLVED: To acquire a desired adhesion area with a liquid level height which is unchanged after applying an adhesive onto an adhesion seat surface of a casing without complicating a manufacturing process, or without heightening cost thoughtlessly, and to prevent generation of peeling caused by deficiency of an adhesive strength. SOLUTION: A plurality of narrow gap grooves for suppressing wet spread of the adhesive enclosing adjacently to the seat surface in parallel with a ridgeline of the seat surface, and controlling the liquid level height, are provided on an outer peripheral part of the seat surface for fixing an optical element thereon by using the adhesive. COPYRIGHT: (C)2010,JPO&INPIT |
