Spectrometer module

Abstract

In a spectroscopic module, a light shielding member is disposed between a plurality of bandpass filters and a light detector. The light shielding member includes a plurality of wall portions. The plurality of wall portions are arranged along an X direction with a light passage opening interposed therebetween, each of a plurality of optical paths from the plurality of bandpass filters to a plurality of light receiving regions passing through the light passage opening. A first wall portion and a second wall portion adjacent to each other among the plurality of wall portions are in contact with the bandpass filter, the bandpass filter corresponding to the light passage opening between the first wall portion and the second wall portion. A width in a Y direction of the light passage opening is larger than a width in the Y direction of the bandpass filter.

What is claimed is: 
     
         1 . A spectroscopic module comprising:
 a plurality of beam splitters that are arranged along a first direction;   a plurality of bandpass filters that are disposed on one side in a second direction intersecting the first direction with respect to the plurality of beam splitters, each of the plurality of bandpass filters facing each of the plurality of beam splitters; and   a light detector that is disposed on the one side in the second direction with respect to the plurality of bandpass filters and includes a plurality of light receiving regions, each of the plurality of light receiving regions facing each of the plurality of bandpass filters;   wherein a length of each of the plurality of beam splitters when seen in a thickness direction of each of the plurality of beam splitters is larger than a thickness of each of the plurality of bandpass filters, and   a thickness of each of the plurality of beam splitters is smaller than the thickness of each of the plurality of bandpass filters.   
     
     
         2 . The spectroscopic module according to  claim 1 ,
 wherein each of the plurality of beam splitters has a rectangular plate shape, and   a length of each side of the rectangular plate shape when seen in the thickness direction of each of the plurality of beam splitters is larger than the thickness of each of the plurality of bandpass filters.   
     
     
         3 . The spectroscopic module according to  claim 1 ,
 wherein each of the plurality of beam splitters has a long shape when seen in the thickness direction of each of the plurality of beam splitters, the long shape having a longitudinal direction.   
     
     
         4 . The spectroscopic module according to  claim 3 ,
 wherein a direction perpendicular to the longitudinal direction when seen in the thickness direction of each of the plurality of beam splitters is a direction parallel to a third direction intersecting both the first direction and the second direction.   
     
     
         5 . The spectroscopic module according to  claim 1 , further comprising:
 a light shielding portion that is disposed between the plurality of bandpass filters and the light detector, and separates a plurality of optical paths from each other, the plurality of optical paths extending from the plurality of bandpass filters to the plurality of light receiving regions, and   wherein a thickness of the light shielding portion is smaller than the thickness of each of the plurality of bandpass filters.