| 摘要 |
A range finder includes an improved module structure, that facilitates injecting a transparent filler uniformly into the entire light guide spaces neither leaving any unfilled region nor impairing the characteristics thereof. A channel of flow (or U-groove) is formed across a partition wall, connecting light guide spaces arranged side by side. This feature allows smooth flow of transparent filler into the range finder module without an unfilled region and consequently no overflow of the transparent filler onto outer wall of the plastic module and onto terminal portion of the lead frame. Another feature of this invention is the presence of shield walls along the channel of flow protruding from the side walls of the channel of flow in an inter-digitated fashion, to prevent the stray light from one light guide space entering the other light guide space through the channel of flow.
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