| 摘要 |
A crosspiece is formed by hardening a resin containing a filler. The crosspiece and a substrate or an optical waveguide plate are joined to one another by the aid of a filler-containing adhesive containing a filler. After that, the filler-containing adhesive is hardened. Those preferably used as the fillers include high strength substances composed of, for example, ceramics, plastic, and glass. Especially, it is preferable that the filler is spherical.
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