| 摘要 |
In a spectral module 1, a photodetector 5 is mounted to an intermediate substrate 81, whereby an optical resin agent 63 interposed between a front face 2a of a substrate 2 and the intermediate substrate 81 is prevented from intruding into a light transmitting hole 50 of the photodetector 5. This can prevent refraction, scattering, and the like from occurring and make light Li appropriately enter a spectroscopic unit 4. In addition, the intermediate substrate 81 has a volume smaller than that of the substrate 2, whereby the intermediate substrate 81 expands/shrinks in a state more similar to the photodetector 5 than the substrate 2 when the temperature in the surroundings of the spectral module 1 changes. Hence, bump connections of the photodetector 5 can more reliably be prevented from breaking upon changes in the temperature in the surroundings of the spectral module 1 than when the photodetector 5 is mounted to the substrate 2.
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