| 摘要 |
<p>The device has an expansion pin (34) whose expansion tab (46) is deformable toward an expanded state in which a free end (54) of the tab is radially pressed against an inner surface (22) of a housing (20) with a radial locking force to slidingly lock the pin with respect to a rear case (12). A limitation unit limits the locking force of the tab at a maximal value regardless of axial screwing force applied on a fixation screw (28). Dampening buffers made of elastic material i.e. foam, are interposed between an edge of a front lens and covering elements.</p> |
