Optical identification module

Abstract

An optical identification module including a sensor and a collimator is provided. The sensor has a plurality of sensing regions. The collimator is disposed on the sensing regions, and the collimator includes a transparent substrate and a first light shielding layer. The first light shielding layer is disposed on a first surface of the transparent substrate. The first light shielding layer includes a plurality of first openings. A ratio of a thickness of the first light shielding layer to a width of each of the first openings is greater than 1.

What is claimed is: 
     
         1 . An optical identification module, comprising:
 a sensor, having a plurality of sensing regions; and   a collimator, disposed on the sensing regions, the collimator comprising:
 a transparent substrate; and 
 a first light shielding layer, disposed on a first surface of the transparent substrate, wherein the first light shielding layer comprises a plurality of first openings, and a ratio of a thickness of the first light shielding layer to a width of each of the first openings is greater than 1. 
   
     
     
         2 . The optical identification module as claimed in  claim 1 , wherein the first light shielding layer is located between the transparent substrate and the sensor, and a size of each of the first openings is less than or equal to a size of each of the sensing regions. 
     
     
         3 . The optical identification module as claimed in  claim 2 , wherein the collimator further comprises:
 a second light shielding layer, disposed on a second surface of the transparent substrate, wherein the second surface is opposite to the first surface, the second light shielding layer comprises a plurality of second openings, and a size of each of the second openings is greater than or equal to the size of each of the first openings.   
     
     
         4 . The optical identification module as claimed in  claim 3 , wherein the collimator further comprises:
 a plurality of microlenses, disposed on the second surface and respectively located in the second openings.   
     
     
         5 . The optical identification module as claimed in  claim 4 , wherein an absolute value of a difference in refractive index between the microlenses and the transparent substrate is less than 0.1. 
     
     
         6 . The optical identification module as claimed in  claim 1 , wherein the transparent substrate is located between the first light shielding layer and the sensor. 
     
     
         7 . The optical identification module as claimed in  claim 6 , wherein the collimator further comprises:
 a second light shielding layer, disposed on a second surface of the transparent substrate, wherein the second surface is opposite to the first surface, the second light shielding layer comprises a plurality of second openings, a size of each of the second openings is less than or equal to a size of each of the sensing regions, and a size of each of the first openings is greater than or equal to the size of each of the second openings.   
     
     
         8 . The optical identification module as claimed in  claim 7 , wherein the collimator further comprises:
 a plurality of microlenses, disposed on the first surface and respectively located in the first openings.   
     
     
         9 . An optical identification module, comprising
 a sensor, having a plurality of sensing regions; and   a collimator, disposed on the sensing regions, the collimator comprising:
 a transparent substrate, having a first surface and a second surface, and the second surface located between the first surface and the sensor; 
 a first light shielding layer, disposed on the first surface, and the first light shielding layer comprising a plurality of first openings; and 
 a second light shielding layer, disposed on the second surface, and the second light shielding layer comprising a plurality of second openings, wherein a size of each of the second openings is less than or equal to a size of each of the sensing regions, and a size of each of the first openings is greater than or equal to the size of each of the second openings. 
   
     
     
         10 . The optical identification module as claimed in  claim 9 , wherein the collimator further comprises:
 a plurality of microlenses, disposed on the first surface and respectively located in the first openings.