| 摘要 |
There is disclosed a substrate unit comprising a light emitting element attachment surface for attaching a light emitting element which emits laser light substantially in parallel to the attachment surface, a light reflecting surface for changing the direction of the light axis of the laser light emitted from the light emitting element by a predetermined angle by reflection, and a light detecting element attachment surface, formed on the same two-dimensional plane as a plane of the light emitting element attachment surface, for attaching a light detecting element which receives light incident from the outside.
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