Patent ID: 8804118
Filing Date: 2014-08-12
Classification: G01J,G02B

Abstract:
1. A spectral module comprising: a substrate, having first and second surfaces, for transmitting light and for receiving light incident on the first surface; a light transmitting unit having a third surface and a fourth surface, wherein the third surface receives light from the second surface of the substrate; a spectroscopic unit, formed on the fourth surface of the light transmitting unit, for internally reflecting and spectrally resolving light incident from the second surface of the substrate, wherein the transmitting unit receives the spectrally resolved light internally reflected from the spectroscopic unit and transmits it back to the second surface of the substrate; and a photodetector, disposed on the first surface of the substrate, for detecting the light spectrally resolved by the spectroscopic unit that is received from the light transmitting unit and transmitted through the substrate from the second to the first surface; wherein the second surface is provided with a recess, adapted to mate with the light transmitting unit through an optical resin agent, having a predetermined positional relationship with a reference unit for positioning the photodetector with respect to the substrate; wherein the recess is provided with a first mating section adapted to mate with the light transmitting unit in an extending direction of a grating groove of the spectroscopic unit and a second mating section adapted to mate with the light transmitting unit in a direction substantially orthogonal to the extending direction of the grating groove; and wherein the second mating section and the light transmitting unit have a gap therebetween smaller than that between the first mating section and the light transmitting unit, and wherein the components of the spectral module are configured and arranged so that light propagates through the system in the following way: