Patent ID: 8604412
Filing Date: 2013-12-10
Classification: G01J,G02B,H01L

Abstract:
1. A spectral module comprising: a main unit for transmitting light therethrough; a spectroscopic unit for spectrally resolving light having entered the main unit from a predetermined surface side of the main unit and reflecting the light toward the predetermined surface; and a photodetector, arranged on the predetermined surface, for detecting the light spectrally resolved by the spectroscopic unit; wherein the photodetector has a substrate unit formed with a light transmitting hole for transmitting therethrough light proceeding to the spectroscopic unit; wherein the light transmitting hole includes a light entrance side unit defining a light entrance opening and a light exit side unit defining a light exit opening; wherein the light entrance side unit is formed such as to have a bottom face substantially parallel to the predetermined surface and become narrower toward the predetermined surface; and wherein the light exit side unit is formed such as to have a side face substantially perpendicular to the predetermined surface and oppose the bottom face.