| 摘要 |
<p>PURPOSE:To prevent resin leakage and resin bleeding of an epoxy resin by fitting a sealant into the fitting part of an outer case and a focus volume instead of its coating. CONSTITUTION:The side wall of a focus volume fitting groove of an outer case contacts the side wall of a rib of the focus volume 10 in the full periphery; further, a gap 8a is provided between the bottom of the outer case groove and the rib tip of the focus volume 10. This design allows an epoxy resin not to leak out of the fitting part of the outer case and the focus volume 10, and resin leakage and bleeding of an epoxy resin due to capillarity accumulate in the gap 8a, so that it is unnecessary to coat the fitting part of the outer case and the focus volume 10 with a sealant.</p> |
